Re: Reports of New Gear
On Wed, Feb 10, 2010 at 8:47 PM, Mark Roberts wrote: > I'm sure it's not vapor-ware. Now rumor-ware, that's a different > animal... > ;-) YOU! cheers, frank -- "Sharpness is a bourgeois concept." -Henri Cartier-Bresson -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Reports of New Gear
Rob Studdert wrote: >On 11/02/2010, Sandy Harris wrote: > >> Panasonic's micro 4/3 20 mm f1.7 takes a 46 mm filter. > >The A/FA20/2.8 has a 67mm filter so I guess the APS lens would lie >some place between if it turns out not to be vapour ware. I'm sure it's not vapor-ware. Now rumor-ware, that's a different animal... ;-) -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Reports of New Gear
On 11/02/2010, Sandy Harris wrote: > Panasonic's micro 4/3 20 mm f1.7 takes a 46 mm filter. The A/FA20/2.8 has a 67mm filter so I guess the APS lens would lie some place between if it turns out not to be vapour ware. -- Rob Studdert (Digital Image Studio) Tel: +61-418-166-870 UTC +10 Hours Gmail, eBay, Skype, Twitter, Facebook, Picasa: distudio -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Reports of New Gear
On 2/10/10, Rob Studdert wrote: > On 10/02/2010, jtainter wrote: > > > Can anyone calculate how large (diameter) the front element of the DA* 20 > F2 will be? This lens will have to be larger than the FA 20 F2.8. Sigma's 20 > F1.8 takes, IIRC, an 82 mm filter. So this will probably take a 77 mm. filter. > > > I don't think that the front element for the cropped sensor 20mm lens > would need to be nearly as large as the FF 20mm lenses but still that > lens pictured does look kind of small, it would be a 58mm filter at > most. Panasonic's micro 4/3 20 mm f1.7 takes a 46 mm filter. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Reports of New Gear
On Wed, Feb 10, 2010 at 6:03 PM, Rob Studdert wrote: > Great theory but there's far more to it, granted the SWA lenses are > required to be retrofocus designs but there are virtually an unlimited > number of ways to acheive this, just look at the design of the new > Nikkor 24/1.4 for example. From a practical perspective I can tell you > that my Sigma 14/2.8 has a substancially larger front element than the > DA14/2.8. My theory is that it will be exactly the size that they make it! ;-) I'd love the 28mm. That translates to right around 40mm for full frame, which makes it just about right for the street. And nice and fast, too, for night shooting. I find that my A50mm 1.7 is too long for much of what I want to shoot at night. Having the 28mm ~and~ the 50 would be a nice combo... The 20mm is enticing, but maybe I'd get the 21mm pancake instead; I know it's a completely different lens so hard to compare, but like the compactness of the pancake. Anyway, they're all pipe dreams for now... ;-) cheers, frank -- "Sharpness is a bourgeois concept." -Henri Cartier-Bresson -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Reports of New Gear
On 11/02/2010, Miserere wrote: > Rob (and JTainter), > > The front element is precisely the one that doesn't change > (substantially) with format size. A lens that is f/1 will have a front > element diameter no smaller than the focal length of the lens. For > each stop that you slow down the lens from f/1, the diameter can > decrease by square root of 2, or aprox. 1.4 time. So the minimum > diameter for the front element of a 20mm f/1 lens is 20/1 = 20mm; for > f/1.4 it's 20/1.4 = 14mm; for f/2 it's 20/1.4/1.4 = 20/2 = 10mm. > > Except this is all wrong, because Pentax's register distance is > 45.46mm, and lenses wider than 45mm will start bringing their rear > element closer and closer to the film/ccd plane. Because there is a > mirror in the way in SLRs, extreme wide angle lenses use a different > optical construction than standard and long focal lengths, it's called > retrofocus, or inverted telephoto. In this design, the front element > is much larger than the aforementioned formula would decree. How > large? As far as I know, it depends on the design, although I'd gladly > hear about any formulas dictating minimum required size independently > of the design. Great theory but there's far more to it, granted the SWA lenses are required to be retrofocus designs but there are virtually an unlimited number of ways to acheive this, just look at the design of the new Nikkor 24/1.4 for example. From a practical perspective I can tell you that my Sigma 14/2.8 has a substancially larger front element than the DA14/2.8. -- Rob Studdert (Digital Image Studio) Tel: +61-418-166-870 UTC +10 Hours Gmail, eBay, Skype, Twitter, Facebook, Picasa: distudio -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Reports of New Gear
On 9 February 2010 21:17, Rob Studdert wrote: > On 10/02/2010, jtainter wrote: > >> Can anyone calculate how large (diameter) the front element of the DA* 20 F2 >> will be? This lens will have to be larger than the FA 20 F2.8. Sigma's 20 >> F1.8 takes, IIRC, an 82 mm filter. So this will probably take a 77 mm. >> filter. > > I don't think that the front element for the cropped sensor 20mm lens > would need to be nearly as large as the FF 20mm lenses but still that > lens pictured does look kind of small, it would be a 58mm filter at > most. Rob (and JTainter), The front element is precisely the one that doesn't change (substantially) with format size. A lens that is f/1 will have a front element diameter no smaller than the focal length of the lens. For each stop that you slow down the lens from f/1, the diameter can decrease by square root of 2, or aprox. 1.4 time. So the minimum diameter for the front element of a 20mm f/1 lens is 20/1 = 20mm; for f/1.4 it's 20/1.4 = 14mm; for f/2 it's 20/1.4/1.4 = 20/2 = 10mm. Except this is all wrong, because Pentax's register distance is 45.46mm, and lenses wider than 45mm will start bringing their rear element closer and closer to the film/ccd plane. Because there is a mirror in the way in SLRs, extreme wide angle lenses use a different optical construction than standard and long focal lengths, it's called retrofocus, or inverted telephoto. In this design, the front element is much larger than the aforementioned formula would decree. How large? As far as I know, it depends on the design, although I'd gladly hear about any formulas dictating minimum required size independently of the design. So I suppose I didn't really give you an answer, huh? :-) In practical terms, a Pentax filter size is always smaller (or equal) than that for the equivalent Sigma lens :-D But seriously, once upon a time Pentax designed a 20mm f/1.4 prototype lens and it had a filter diameter of 77mm: http://kmp.bdimitrov.de/lenses/primes/_prototype/K20f1.4.html The very nice (and compact) FA 20mm f/2.8 has a 67mm diameter, which could maybe be retained considering we'd be increasing the entrance pupil by 1 stop, but also reducing the FoV by about 1 stop, for a DA 20mm f/2. Of course, we also have to allow space for weather sealing, and maybe SDM gadgetry (this is just a guess). But I think that if they want to, they could keep the filter size at 67mm. Cheers, --M. -- http://EnticingTheLight.com A Quest for Photographic Enlightenment -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Reports of New Gear
On Wed, Feb 10, 2010 at 4:11 AM, David Savage wrote: > News of Nikons new 24mm f1.4 has me dribbling a bit too. > > DS Ohh, i could use one of those.;-) Dave > > On 10 February 2010 04:51, John Celio wrote: >>> 645D >>> K-m2 >>> DA*10-16 f/4 >>> DA*20 f/2 >>> DA*28 f/2 >>> >>> http://www.dchome.net/viewthread.php?tid=827626&extra=page%3D1 >> >> Someone get me a bib, those lenses are making me drool uncontrollably. >> >> John >> (it could just be the burritos I've got warming in the microwave, but >> I'm pretty sure it's those lenses) > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. > -- Documenting Life in Rural Ontario. www.caughtinmotion.com http://brooksinthecountry.blogspot.com/ York Region, Ontario, Canada -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Reports of New Gear
On 10/02/2010, David Savage wrote: > News of Nikons new 24mm f1.4 has me dribbling a bit too. The new AF-S NIKKOR 16-35MM F/4G ED VR looks pretty good too, cost differential is looking a lot more attractive. -- Rob Studdert (Digital Image Studio) Tel: +61-418-166-870 UTC +10 Hours Gmail, eBay, Skype, Twitter, Facebook, Picasa: distudio -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Reports of New Gear
News of Nikons new 24mm f1.4 has me dribbling a bit too. DS On 10 February 2010 04:51, John Celio wrote: >> 645D >> K-m2 >> DA*10-16 f/4 >> DA*20 f/2 >> DA*28 f/2 >> >> http://www.dchome.net/viewthread.php?tid=827626&extra=page%3D1 > > Someone get me a bib, those lenses are making me drool uncontrollably. > > John > (it could just be the burritos I've got warming in the microwave, but > I'm pretty sure it's those lenses) -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Reports of New Gear
Image looks like the contour of a 645D. 2010/2/10 Bong Manayon : > Anybody read Japanese? > > http://www.camera-pentax.jp/new/ > > On Wed, Feb 10, 2010 at 2:25 PM, Thibouille wrote: >> Those pages are "bet" from magazine, their take on what will happen >> (maybe based on actual facts). >> >> 10-16/4 is BS. If there's one it will be /2.8. >> K-m2 is BS as well, certainly with a fake body base on k20d and about >> 20/28mm both lens are same size and suspiciously compact one at that. >> >> Smell the BS. It might hint at a couple things to come though. >> >> On Tuesday, February 9, 2010, jtainter wrote: >>> >From Dpreview: >>> >>> http://forums.dpreview.com/forums/read.asp?forum=1036&message=34485521 >>> >>> 645D >>> K-m2 >>> DA*10-16 f/4 >>> DA*20 f/2 >>> DA*28 f/2 >>> >>> Maybe more than the usual rumor. There seem to be photos of the gear: >>> >>> http://forums.dpreview.com/forums/read.asp?forum=1036&message=34485615 >>> >>> which points to: >>> >>> http://www.dchome.net/viewthread.php?tid=827626&extra=page%3D1 >>> >>> The DA* 20 F2.0 look very interesting, but it would have to be quite large? >>> >>> The DA 10-16 F4 is disappointing. It probably means that Pentax won't bring >>> out a DA version of the excellent and very useful Tokina 11-16 F2.8. Still, >>> I could live with F4 in such a lens if Pentax could improve high ISO >>> performance. >>> >>> Joe >>> >>> >>> >>> >>> -- >>> PDML Pentax-Discuss Mail List >>> PDML@pdml.net >>> http://pdml.net/mailman/listinfo/pdml_pdml.net >>> to UNSUBSCRIBE from the PDML, please visit the link directly above and >>> follow the directions. >>> >> >> -- >> Thibault Massart aka Thibouille/Thibs >> -- >> Photo: K-7, Sigma 28/1.8 macro, FA50/1.4, DA40Ltd, K30/2.8, DA16-45, >> DA50-135, DA50-200, 360FGZ ... >> Laptop: Macbook 13" Unibody SnowLeo/Win7 >> Programing: Delphi 2009 >> >> -- >> PDML Pentax-Discuss Mail List >> PDML@pdml.net >> http://pdml.net/mailman/listinfo/pdml_pdml.net >> to UNSUBSCRIBE from the PDML, please visit the link directly above and >> follow the directions. >> > > > > -- > Bong Manayon > http://www.bong.uni.cc > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. > -- http://www.alunfoto.no/galleri/ http://alunfoto.blogspot.com -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Reports of New Gear
2010/2/10 Thibouille : > Smell the BS. It might hint at a couple things to come though. Mark! Jostein -- http://www.alunfoto.no/galleri/ http://alunfoto.blogspot.com -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Reports of New Gear
Anybody read Japanese? http://www.camera-pentax.jp/new/ On Wed, Feb 10, 2010 at 2:25 PM, Thibouille wrote: > Those pages are "bet" from magazine, their take on what will happen > (maybe based on actual facts). > > 10-16/4 is BS. If there's one it will be /2.8. > K-m2 is BS as well, certainly with a fake body base on k20d and about > 20/28mm both lens are same size and suspiciously compact one at that. > > Smell the BS. It might hint at a couple things to come though. > > On Tuesday, February 9, 2010, jtainter wrote: >> >From Dpreview: >> >> http://forums.dpreview.com/forums/read.asp?forum=1036&message=34485521 >> >> 645D >> K-m2 >> DA*10-16 f/4 >> DA*20 f/2 >> DA*28 f/2 >> >> Maybe more than the usual rumor. There seem to be photos of the gear: >> >> http://forums.dpreview.com/forums/read.asp?forum=1036&message=34485615 >> >> which points to: >> >> http://www.dchome.net/viewthread.php?tid=827626&extra=page%3D1 >> >> The DA* 20 F2.0 look very interesting, but it would have to be quite large? >> >> The DA 10-16 F4 is disappointing. It probably means that Pentax won't bring >> out a DA version of the excellent and very useful Tokina 11-16 F2.8. Still, >> I could live with F4 in such a lens if Pentax could improve high ISO >> performance. >> >> Joe >> >> >> >> >> -- >> PDML Pentax-Discuss Mail List >> PDML@pdml.net >> http://pdml.net/mailman/listinfo/pdml_pdml.net >> to UNSUBSCRIBE from the PDML, please visit the link directly above and >> follow the directions. >> > > -- > Thibault Massart aka Thibouille/Thibs > -- > Photo: K-7, Sigma 28/1.8 macro, FA50/1.4, DA40Ltd, K30/2.8, DA16-45, > DA50-135, DA50-200, 360FGZ ... > Laptop: Macbook 13" Unibody SnowLeo/Win7 > Programing: Delphi 2009 > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. > -- Bong Manayon http://www.bong.uni.cc -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Reports of New Gear
Those pages are "bet" from magazine, their take on what will happen (maybe based on actual facts). 10-16/4 is BS. If there's one it will be /2.8. K-m2 is BS as well, certainly with a fake body base on k20d and about 20/28mm both lens are same size and suspiciously compact one at that. Smell the BS. It might hint at a couple things to come though. On Tuesday, February 9, 2010, jtainter wrote: > >From Dpreview: > > http://forums.dpreview.com/forums/read.asp?forum=1036&message=34485521 > > 645D > K-m2 > DA*10-16 f/4 > DA*20 f/2 > DA*28 f/2 > > Maybe more than the usual rumor. There seem to be photos of the gear: > > http://forums.dpreview.com/forums/read.asp?forum=1036&message=34485615 > > which points to: > > http://www.dchome.net/viewthread.php?tid=827626&extra=page%3D1 > > The DA* 20 F2.0 look very interesting, but it would have to be quite large? > > The DA 10-16 F4 is disappointing. It probably means that Pentax won't bring > out a DA version of the excellent and very useful Tokina 11-16 F2.8. Still, I > could live with F4 in such a lens if Pentax could improve high ISO > performance. > > Joe > > > > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. > -- Thibault Massart aka Thibouille/Thibs -- Photo: K-7, Sigma 28/1.8 macro, FA50/1.4, DA40Ltd, K30/2.8, DA16-45, DA50-135, DA50-200, 360FGZ ... Laptop: Macbook 13" Unibody SnowLeo/Win7 Programing: Delphi 2009 -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Reports of New Gear
On 10/02/2010, jtainter wrote: > Can anyone calculate how large (diameter) the front element of the DA* 20 F2 > will be? This lens will have to be larger than the FA 20 F2.8. Sigma's 20 > F1.8 takes, IIRC, an 82 mm filter. So this will probably take a 77 mm. filter. I don't think that the front element for the cropped sensor 20mm lens would need to be nearly as large as the FF 20mm lenses but still that lens pictured does look kind of small, it would be a 58mm filter at most. -- Rob Studdert (Digital Image Studio) Tel: +61-418-166-870 UTC +10 Hours Gmail, eBay, Skype, Twitter, Facebook, Picasa: distudio -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Reports of New Gear
Mark wrote: "The PMA show begins on Feb 21st. I expect we'll know details then. "What will be interesting is seeing if there are Tokina equivalents or if Pentax is back to designing their own glass again." Pentax has been designing all along. Of the joint lenses, only the 12-24 was designed by Tokina. Pentax designed all the others. What is surprising is that Pentax dropped their plans to bring out a DA version of Tokina's 11-16 F2.8. It is an excellent design, and I'd gladly swap 1 mm of focal length for that extra stop. Can anyone calculate how large (diameter) the front element of the DA* 20 F2 will be? This lens will have to be larger than the FA 20 F2.8. Sigma's 20 F1.8 takes, IIRC, an 82 mm filter. So this will probably take a 77 mm. filter. Joe -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Reports of New Gear
AlunFoto wrote: >2010/2/9 Mark Roberts : >> I might be interested in the 10-16 if it's got a better (closer) >> minimum focusing distance than the 12-24. > >Me too. Could be a perfect compliment to the 16-50 or 16-45 too. :-) The PMA show begins on Feb 21st. I expect we'll know details then. What will be interesting is seeing if there are Tokina equivalents or if Pentax is back to designing their own glass again. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Reports of New Gear
2010/2/9 Mark Roberts : > I might be interested in the 10-16 if it's got a better (closer) > minimum focusing distance than the 12-24. Me too. Could be a perfect compliment to the 16-50 or 16-45 too. :-) Jostein -- http://www.alunfoto.no/galleri/ http://alunfoto.blogspot.com -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Reports of New Gear
John Celio wrote: >> 645D >> K-m2 >> DA*10-16 f/4 >> DA*20 f/2 >> DA*28 f/2 >> >> http://www.dchome.net/viewthread.php?tid=827626&extra=page%3D1 > >Someone get me a bib, those lenses are making me drool uncontrollably. I might be interested in the 10-16 if it's got a better (closer) minimum focusing distance than the 12-24. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
RE: Reports of New Gear
> 645D > K-m2 > DA*10-16 f/4 > DA*20 f/2 > DA*28 f/2 > > http://www.dchome.net/viewthread.php?tid=827626&extra=page%3D1 Someone get me a bib, those lenses are making me drool uncontrollably. John (it could just be the burritos I've got warming in the microwave, but I'm pretty sure it's those lenses) -- http://www.neovenator.com http://www.cafepress.com/jacelio -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Reports of New Gear
The Km2 looks like a cross between a K-7 and a K10/20d well sort of
anyway. Looks fishy to me. Then again it seems to be an advertisement
based on rumors.
On 2/9/2010 12:56 PM, jtainter wrote:
> From Dpreview:
http://forums.dpreview.com/forums/read.asp?forum=1036&message=34485521
645D
K-m2
DA*10-16 f/4
DA*20 f/2
DA*28 f/2
Maybe more than the usual rumor. There seem to be photos of the gear:
http://forums.dpreview.com/forums/read.asp?forum=1036&message=34485615
which points to:
http://www.dchome.net/viewthread.php?tid=827626&extra=page%3D1
The DA* 20 F2.0 look very interesting, but it would have to be quite large?
The DA 10-16 F4 is disappointing. It probably means that Pentax won't bring out
a DA version of the excellent and very useful Tokina 11-16 F2.8. Still, I could
live with F4 in such a lens if Pentax could improve high ISO performance.
Joe
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interface subtly weird.\par
}
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