Prices crashing on Pentax-F 1.7x AF TC?
Seem to be a LOT of Pentax-F 1.7x AF TCs on the market these days and recently they have been selling for just $300 and under. Doesn't seem that long ago when $350 for one was a Good Deal. Makes me wonder if the replacement HD TC isn't about to hit the bricks (and I wonder what it will be priced at?). Makes me think that if someone had one they were THINKING about selling that it might be wise to do it soon (or take the chance that with demand dropping as some buyers opt for the new one that prices drop even further). Much depends on the price of the new one, of course, and if it has all of the same capabilities (or more). -- Nothing is sure but death and Pentaxes. -- 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: A*300/4 with Pentax 1.7x AF TC
On 10 November 2010 23:10, Bob Sullivan wrote: > Subash, > I can't get it to autofocus with the A400/5.6, > but the A200 f4 and A300 f4 work fine for me. > I think this is an autofocus with the 1.7 and A300. > http://picasaweb.google.com/rf.sullivan/PDML2009#5436368437062520114 > Regards, Bob S. I've managed to get my 1.7x TC to focus with a Tokina 400mm f/5.6 and a Sigma CAT 400mm f/5.6, but it does need good light. I've had no issues whatsoever with a 200mm f/4. For shits and giggles I once mounted the TC on a Sigma CAT 600mm f/8 and did get it to AF; it was very sunny and I chose contrasty subjects, but I was still impressed. All this on my K10D, by the way. --M. -- \/\/o/\/\ --> http://WorldOfMiserere.com 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: A*300/4 with Pentax 1.7x AF TC
3.5 with the 1.7x adapter gives ~5.6 as the maximum aperture so that would make sense. On 11/10/2010 11:01 PM, Subash wrote: On Wed, 10 Nov 2010 22:47:46 -0500 "P. J. Alling" wrote: That combination works very well together. The largest problem is achieving focus lock. Pentax doesn't recommend the AF 1.7x being used with lenses having a slower maximum aperture than f2.8. This results in a maximum aperture equivalent to f4.6. Using it with an f4.0 lens gives a maximum aperture of ~f6.7 which is 2/3 of a stop slower than the slowest maximum aperture, (f5.6), I've ever seen on a Pentax auto focus lens. At those apertures the cameras really struggle to focus in even moderately low light conditions. However in bright light AF is no real problem and the images are quite sharp. that's reassuring to know. i guessed it could be because of the slower f/4, though the user manual does list a f3.5 zoom... thanks, subash -- "His lack of education is more than compensated for by his keenly developed moral bankruptcy." -Woody Allen -- 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: A*300/4 with Pentax 1.7x AF TC
On Wed, 10 Nov 2010 22:10:57 -0600 Bob Sullivan wrote: > but the A200 f4 and A300 f4 work fine for me. > I think this is an autofocus with the 1.7 and A300. > http://picasaweb.google.com/rf.sullivan/PDML2009#5436368437062520114 thanks Bob, it is nice to know the combo works well and that photo looks good... regards, subash -- 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: A*300/4 with Pentax 1.7x AF TC
On Wed, 10 Nov 2010 23:08:49 -0500 John Francis wrote: > On Thu, Nov 11, 2010 at 08:54:27AM +0530, Subash wrote: > > does the pentax 1.7x TC work well with the A*300/4 > I believe the TC is only claimed to work with lenses faster than f4.0 > (probably because the auto-focus logic claims to want a lens of f5.6 > or faster, and a 1.7TC on a f4 lens ends up with a maximum aperture > of f6.8) thanks John. apparently the TC is in production again (assembled in vietnam) but it is available for sale only in japan. there is a user from tokyo in pentaxforums, tom1803, who has these for sale NIB. i've just ordered one... regards, subash -- 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: A*300/4 with Pentax 1.7x AF TC
On Wed, 10 Nov 2010 22:07:50 -0600 Bob Sullivan wrote: > Subash, > I use the combination regularly and like it very much. > It travels much easier than the A400/5.6 and has autofocus. > I recommend it highly. thanks, Bob. good to know. would you have images taken with this combo online somewhere. would really like to see it if you have... thanks, subash -- 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: A*300/4 with Pentax 1.7x AF TC
Subash, I can't get it to autofocus with the A400/5.6, but the A200 f4 and A300 f4 work fine for me. I think this is an autofocus with the 1.7 and A300. http://picasaweb.google.com/rf.sullivan/PDML2009#5436368437062520114 Regards, Bob S. On Wed, Nov 10, 2010 at 10:01 PM, Subash wrote: > On Wed, 10 Nov 2010 22:47:46 -0500 > "P. J. Alling" wrote: > >> That combination works very well together. The largest problem is >> achieving focus lock. Pentax doesn't recommend the AF 1.7x being >> used with lenses having a slower maximum aperture than f2.8. This >> results in a maximum aperture equivalent to f4.6. Using it with an >> f4.0 lens gives a maximum aperture of ~f6.7 which is 2/3 of a stop >> slower than the slowest maximum aperture, (f5.6), I've ever seen on >> a Pentax auto focus lens. At those apertures the cameras really >> struggle to focus in even moderately low light conditions. However >> in bright light AF is no real problem and the images are quite sharp. > > that's reassuring to know. i guessed it could be because of the > slower f/4, though the user manual does list a f3.5 zoom... > > thanks, subash > > -- > 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. > -- 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: A*300/4 with Pentax 1.7x AF TC
On Thu, Nov 11, 2010 at 08:54:27AM +0530, Subash wrote: > hi, > > does the pentax 1.7x TC work well with the A*300/4 (with the 'limited' > AF functionality it brings to manual focus lenses)? the user manual of > the TC does not mention this lens in the list of compatible lenses... if > things go as they should, i just might enabled with these two... I believe the TC is only claimed to work with lenses faster than f4.0 (probably because the auto-focus logic claims to want a lens of f5.6 or faster, and a 1.7TC on a f4 lens ends up with a maximum aperture of f6.8) The AF1.7x works just fine with the A* 300/2.8 ... -- 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: A*300/4 with Pentax 1.7x AF TC
Subash, I use the combination regularly and like it very much. It travels much easier than the A400/5.6 and has autofocus. I recommend it highly. Regards, Bob S. On Wed, Nov 10, 2010 at 9:24 PM, Subash wrote: > hi, > > does the pentax 1.7x TC work well with the A*300/4 (with the 'limited' > AF functionality it brings to manual focus lenses)? the user manual of > the TC does not mention this lens in the list of compatible lenses... if > things go as they should, i just might enabled with these two... > > appreciate your inputs... thanks and regards, subash > > -- > 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. > -- 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: A*300/4 with Pentax 1.7x AF TC
On Wed, 10 Nov 2010 22:47:46 -0500 "P. J. Alling" wrote: > That combination works very well together. The largest problem is > achieving focus lock. Pentax doesn't recommend the AF 1.7x being > used with lenses having a slower maximum aperture than f2.8. This > results in a maximum aperture equivalent to f4.6. Using it with an > f4.0 lens gives a maximum aperture of ~f6.7 which is 2/3 of a stop > slower than the slowest maximum aperture, (f5.6), I've ever seen on > a Pentax auto focus lens. At those apertures the cameras really > struggle to focus in even moderately low light conditions. However > in bright light AF is no real problem and the images are quite sharp. that's reassuring to know. i guessed it could be because of the slower f/4, though the user manual does list a f3.5 zoom... thanks, subash -- 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: A*300/4 with Pentax 1.7x AF TC
That combination works very well together. The largest problem is achieving focus lock. Pentax doesn't recommend the AF 1.7x being used with lenses having a slower maximum aperture than f2.8. This results in a maximum aperture equivalent to f4.6. Using it with an f4.0 lens gives a maximum aperture of ~f6.7 which is 2/3 of a stop slower than the slowest maximum aperture, (f5.6), I've ever seen on a Pentax auto focus lens. At those apertures the cameras really struggle to focus in even moderately low light conditions. However in bright light AF is no real problem and the images are quite sharp. On 11/10/2010 10:24 PM, Subash wrote: hi, does the pentax 1.7x TC work well with the A*300/4 (with the 'limited' AF functionality it brings to manual focus lenses)? the user manual of the TC does not mention this lens in the list of compatible lenses... if things go as they should, i just might enabled with these two... appreciate your inputs... thanks and regards, subash -- "His lack of education is more than compensated for by his keenly developed moral bankruptcy." -Woody Allen -- 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.
A*300/4 with Pentax 1.7x AF TC
hi, does the pentax 1.7x TC work well with the A*300/4 (with the 'limited' AF functionality it brings to manual focus lenses)? the user manual of the TC does not mention this lens in the list of compatible lenses... if things go as they should, i just might enabled with these two... appreciate your inputs... thanks and regards, subash -- 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: AF TC?
On Thu, 3 Jul 2003 20:26:04 -0400, jerome wrote: > Your understanding is correct. In that respect, I suppose it can be said that > it is not a "true" AF adaptor. Sorry to have misled you. However, I wouldn't > say that it is totally useless for an AF lens (I use it with an FA 300mm 2.8), > as it can be used in the same fashion as you described for the mf lenses. I used it with the FA* 200/2.8 last weekend. Worked fine. TTYL, DougF KG4LMZ
Re: AF TC?
> But isn't this the af adapter for mf lenses. The way I understand is that it > moves the tc element to make mf lenes "af". It does not actually pass the af > info to the lens Your understanding is correct. In that respect, I suppose it can be said that it is not a "true" AF adaptor. Sorry to have misled you. However, I wouldn't say that it is totally useless for an AF lens (I use it with an FA 300mm 2.8), as it can be used in the same fashion as you described for the mf lenses. It is my hope (and I'm sure that of plenty others) that Pentax eventually gets around to fixing such omissions in their gear line-up. I hope you find what you're looking for. - jerome
Re: AF TC?
But isn't this the af adapter for mf lenses. The way I understand is that it moves the tc element to make mf lenes "af". It does not actually pass the af info to the lens Jason Sent via wireless messaging device.
Re: AF TC?
> As far as I know, there are no pentax af tc's. And now you know differently :o) http://www.pentax.co.uk/cgi- bin/pentax.storefront/3f04b3a1007a0f482740c2d886f006a5/Catalog/1023 There's a typo on that page, it should be 1.7x, not 17.x (boy, wouldn't that be interesting). In case the page doesn't load properly, that should be the Pentax 1.7x AF adapter that you're looking at. You'll get very mixed responses with respect to how well the AF part of this TC actually works (basically you have to get it "close" to focused, and then the TC will do the rest)... but at least you now know it exists. Regards, - jerome
Re: AF TC?
As far as I know, there are no pentax af tc's. Does anyone have any 3rd party recommendations for these lenses? Jason Sent via wireless messaging device.
Re: AF TC?
Which are the best AF teleconverters for use with F 100mm macro and the FA 200mm f/2.8? The best TC for FA*200/2.8 is A2X-L, as suggested by Pentax. However, it is not AF. regards, Alan Chan _ MSN 8 helps eliminate e-mail viruses. Get 2 months FREE*. http://join.msn.com/?page=features/virus
Re: SMCP-FA 100mm f2.8 and 1.7x AF TC
Hi Shaun, On Tue, 23 Jul 2002 16:42:32 +1000, Shaun Canning wrote: > Has anyone tried using this combination? In theory it would/should provide a > 170mm f/4.76 Macro. Thoughts? I haven't tried that combination, but the 1.7X AF T/C works just fine with my Tamron 90/2.5, SMC-A 50/1.4, and SMC-A 200/4, though it gets a little "touchy" with an f/4 lens. TTYL, DougF KG4LMZ - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
SMCP-FA 100mm f2.8 and 1.7x AF TC
Has anyone tried using this combination? In theory it would/should provide a 170mm f/4.76 Macro. Thoughts? Cheers Shaun. - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
