Re: 300mm Kitlens
Yes it does have a filter like element on the mount side. I can't remove it manually. Tried a UV filter today and my impression is sharpness has improved, almost razor sharp. Focusing is very difficult. It pops in and out of focus maybe I need a Katz screen. Toine On 11 April 2010 04:36, Graydon gray...@marost.ca wrote: On Sat, Apr 10, 2010 at 04:11:27PM +0200, Toine scripsit: Thanks, I'll try that with a UV filter. I knew that some lens designs need a filter at the end of their optical path. This one doesn't have a filter thread at the end. Even when you unscrew the kmount part? I've wound up with a bizarre collection of 30.5mm filters, and interesting scars from figuring out how to screw the filter into a place that assumes either specialized tools or very thin fingers. The softness is only visible when the lens is fully extended at 2.5 meter focussing range. It has optical parts in the front and rear. The rear parts don't move during focussing. Most likely the contraption is optimized at infinity. Quite possible. I've certainly never seen the lens you've got, so I'm speaking in generalities. -- Graydon -- 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: 300mm Kitlens
On Sun, Apr 11, 2010 at 06:52:16PM +0200, Toine scripsit: Yes it does have a filter like element on the mount side. I can't remove it manually. Tried a UV filter today and my impression is sharpness has improved, almost razor sharp. Focusing is very difficult. It pops in and out of focus maybe I need a Katz screen. Katz screens are helpful, but focusing being difficult is an inherent property of catadioptric designs; the plane of focus is very flat and has no depth to speak of (most but not all of a blackbird (treating North American robins and the Eurasian blackbird as equivalent units of measurement) at 20m, plane-of-focus depth.). This is great for many applications, especially off support, but it's something of a trick for hand-held shooting. I can manage one in five shots having the plane of focus more or less where I want it handheld on a very good day with something to lean against. Some days it is more like one in 15. -- Graydon -- 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: 300mm Kitlens
2010/4/10 Toine to...@repiuk.nl: http://www.repiuk.nl/index.php/blog-mainmenu-97/126-300mm-kitlens :) Toine neato =) -- 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: 300mm Kitlens
On Sat, Apr 10, 2010 at 6:31 AM, eckinator eckina...@gmail.com wrote: neato =) It is! 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: 300mm Kitlens
Yep it arrived today. Maybe I'll try some stealthy street photography. It's a little soft for birds. Toine On 10 April 2010 13:38, frank theriault knarftheria...@gmail.com wrote: On Sat, Apr 10, 2010 at 6:31 AM, eckinator eckina...@gmail.com wrote: neato =) It is! 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. -- 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: 300mm Kitlens
On Sat, Apr 10, 2010 at 7:44 AM, Toine to...@repiuk.nl wrote: Yep it arrived today. Maybe I'll try some stealthy street photography. It's a little soft for birds. Street photography with a 300mm? :-0 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: 300mm Kitlens
Toine wrote: Subject: 300mm Kitlens http://www.repiuk.nl/index.php/blog-mainmenu-97/126-300mm-kitlens :) Toine Initially I read this as 300mm kittens and nearly sent a disgusted of Tunbridge Wells message. Luckily I restrained myself... Chris. -- 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: 300mm Kitlens
? On 10 April 2010 13:56, Chris Mitchell chris.mitch...@which.net wrote: Toine wrote: Subject: 300mm Kitlens http://www.repiuk.nl/index.php/blog-mainmenu-97/126-300mm-kitlens :) Toine Initially I read this as 300mm kittens and nearly sent a disgusted of Tunbridge Wells message. Luckily I restrained myself... Chris. -- 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: 300mm Kitlens
http://en.wikipedia.org/wiki/Disgusted_of_Tunbridge_Wells -Original Message- From: pdml-boun...@pdml.net [mailto:pdml-boun...@pdml.net] On Behalf Of Toine Sent: 10 April 2010 14:14 To: Pentax-Discuss Mail List Subject: Re: 300mm Kitlens ? On 10 April 2010 13:56, Chris Mitchell chris.mitch...@which.net wrote: Toine wrote: Subject: 300mm Kitlens http://www.repiuk.nl/index.php/blog-mainmenu-97/126-300mm-kitlens :) Toine Initially I read this as 300mm kittens and nearly sent a disgusted of Tunbridge Wells message. Luckily I restrained myself... Chris. -- 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. -- 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: 300mm Kitlens
On Sat, Apr 10, 2010 at 01:44:24PM +0200, Toine scripsit: Yep it arrived today. Maybe I'll try some stealthy street photography. It's a little soft for birds. It looks like it's missing its full-pass neutral density filter; many of the catadioptric lenses seem to assume there will be a filter, so if you (for some inexplicable reason) don't want to make things dimmer, you need to stuff a full-pass piece of glass in there. Don't know if this applies to the particular lens, but the picture sure looks like what my Rokinon 800/8 did before I got a full-pass neutral density filter for it. It's now quite sharp, if I manage to get the focus-plane-like-a-microtome where I want it. -- Graydon -- 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: 300mm Kitlens
On Sat, Apr 10, 2010 at 07:52:17AM -0400, frank theriault scripsit: On Sat, Apr 10, 2010 at 7:44 AM, Toine to...@repiuk.nl wrote: Yep it arrived today. Maybe I'll try some stealthy street photography. It's a little soft for birds. Street photography with a 300mm? Good for isolating faces. -- Graydon -- 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: 300mm Kitlens
Aha! Now I'm hurting my brain what the words 300mm kittens would trigger in a letter to the newspaper. On 10 April 2010 15:25, Chris Mitchell chris.mitch...@which.net wrote: http://en.wikipedia.org/wiki/Disgusted_of_Tunbridge_Wells -Original Message- From: pdml-boun...@pdml.net [mailto:pdml-boun...@pdml.net] On Behalf Of Toine Sent: 10 April 2010 14:14 To: Pentax-Discuss Mail List Subject: Re: 300mm Kitlens ? On 10 April 2010 13:56, Chris Mitchell chris.mitch...@which.net wrote: Toine wrote: Subject: 300mm Kitlens http://www.repiuk.nl/index.php/blog-mainmenu-97/126-300mm-kitlens :) Toine Initially I read this as 300mm kittens and nearly sent a disgusted of Tunbridge Wells message. Luckily I restrained myself... Chris. -- 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. -- 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: 300mm Kitlens
Thanks, I'll try that with a UV filter. I knew that some lens designs need a filter at the end of their optical path. This one doesn't have a filter thread at the end. The softness is only visible when the lens is fully extended at 2.5 meter focussing range. It has optical parts in the front and rear. The rear parts don't move during focussing. Most likely the contraption is optimized at infinity. On 10 April 2010 15:38, Graydon gray...@marost.ca wrote: On Sat, Apr 10, 2010 at 01:44:24PM +0200, Toine scripsit: Yep it arrived today. Maybe I'll try some stealthy street photography. It's a little soft for birds. It looks like it's missing its full-pass neutral density filter; many of the catadioptric lenses seem to assume there will be a filter, so if you (for some inexplicable reason) don't want to make things dimmer, you need to stuff a full-pass piece of glass in there. Don't know if this applies to the particular lens, but the picture sure looks like what my Rokinon 800/8 did before I got a full-pass neutral density filter for it. It's now quite sharp, if I manage to get the focus-plane-like-a-microtome where I want it. -- Graydon -- 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: 300mm Kitlens
On Sat, Apr 10, 2010 at 04:11:27PM +0200, Toine scripsit: Thanks, I'll try that with a UV filter. I knew that some lens designs need a filter at the end of their optical path. This one doesn't have a filter thread at the end. Even when you unscrew the kmount part? I've wound up with a bizarre collection of 30.5mm filters, and interesting scars from figuring out how to screw the filter into a place that assumes either specialized tools or very thin fingers. The softness is only visible when the lens is fully extended at 2.5 meter focussing range. It has optical parts in the front and rear. The rear parts don't move during focussing. Most likely the contraption is optimized at infinity. Quite possible. I've certainly never seen the lens you've got, so I'm speaking in generalities. -- Graydon -- 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.
