Re: Lens rear caps - Pentax vs. non-Pentax (Question)
On 1/18/2011 1:49 AM, David Mann wrote: On Jan 18, 2011, at 9:46 AM, John Graves wrote: In the FWIW department, Leica bayonet caps go on any which way. It is not a REQUIREMENT that the Leica name be oriented correctly. But fellow Leicaphiles WILL notice. A bit like the correct way to position a tyre on a bicycle. If it has a logo or label on it, position it over the valve. Makes it slightly easier to find the valve, and bike snobs will see that you value good workmanship. Dave If you can't find the valve stem on a bicycle wheel... -- Where's the Kaboom? There was supposed to be an Earth-shattering Kaboom! --Marvin the Martian. -- 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.
Lens rear caps - Pentax vs. non-Pentax (Question)
The rear lens cups for Pentax and Tokina lenses are made so that can be attached in all three angular orientations (corresponding to the three tabs). I have a Tamron lens (70-300) that has a cap that is polarized, and can only be attached in one position. Just recently I discovered that several Sigma lenses come with the same sort of rear caps. So, the question is why do they polarize the cap? It makes it so much more inconvenient to put the cap on with one hand... Any insights? Thanks, Igor -- 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: Lens rear caps - Pentax vs. non-Pentax (Question)
On Jan 17, 2011, at 13:59, Igor Roshchin wrote: The rear lens cups for Pentax and Tokina lenses are made so that can be attached in all three angular orientations (corresponding to the three tabs). I have a Tamron lens (70-300) that has a cap that is polarized, and can only be attached in one position. Just recently I discovered that several Sigma lenses come with the same sort of rear caps. So, the question is why do they polarize the cap? It makes it so much more inconvenient to put the cap on with one hand... Yes, I have an official Tamron rear cap with this defect. I have put a big bright white line on the bottom of the cap which I can use to line up visually with the red dot. It helps, but is still a pain in the rear! I have NO insight as to why they do this. -Charles -- Charles Robinson - charl...@visi.com Minneapolis, MN http://charles.robinsontwins.org http://www.facebook.com/charles.robinson -- 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: Lens rear caps - Pentax vs. non-Pentax (Question)
So, the question is why do they polarize the cap? It makes it so much more inconvenient to put the cap on with one hand... I have NO insight as to why they do this. I'd bet it's a patent issue of some sort, but I don't know either. John -- http://www.jacelio.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: Lens rear caps - Pentax vs. non-Pentax (Question)
In the FWIW department, Leica bayonet caps go on any which way. It is not a REQUIREMENT that the Leica name be oriented correctly. Front caps just snap into the lens. John Graves WA1JG jh.gra...@verizon.net John Celio wrote: So, the question is why do they polarize the cap? It makes it so much more inconvenient to put the cap on with one hand... I have NO insight as to why they do this. I'd bet it's a patent issue of some sort, but I don't know either. John -- http://www.jacelio.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: Lens rear caps - Pentax vs. non-Pentax (Question)
On Mon, 17 Jan 2011 14:59 -0500, Igor Roshchin s...@komkon.org wrote: The rear lens cups for Pentax and Tokina lenses are made so that can be attached in all three angular orientations (corresponding to the three tabs). I have a Tamron lens (70-300) that has a cap that is polarized, and can only be attached in one position. Just recently I discovered that several Sigma lenses come with the same sort of rear caps. So, the question is why do they polarize the cap? It makes it so much more inconvenient to put the cap on with one hand... Any insights? I don't know about the Tamrons but I have a couple of Sigma caps that are designed to fit both the Pentax KPA and Sigma SA mounts. There's a mark on the cap to indicate where you should line up the cap for each mount, so they will only attach in the one location (unless you modify the cap by cutting off some of the plastic tabs). Maybe the Tamron caps are also designed for two different mounts. Cheers Brian ++ Brian Walters Western Sydney Australia http://lyons-ryan.org/southernlight/ -- -- http://www.fastmail.fm - A no graphics, no pop-ups email service -- 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: Lens rear caps - Pentax vs. non-Pentax (Question)
Igor Roshchin The rear lens cups for Pentax and Tokina lenses are made so that can be attached in all three angular orientations (corresponding to the three tabs). I have a Tamron lens (70-300) that has a cap that is polarized, and can only be attached in one position. Just recently I discovered that several Sigma lenses come with the same sort of rear caps. So, the question is why do they polarize the cap? It makes it so much more inconvenient to put the cap on with one hand... Any insights? On the rear cap department, Pentax is still better than Sigma Tamron. As a result, as soon as I buy one of those lenses (bought two Sigmas over the last years) I replace the odd rear cap with a Pentax or generic (unmarked) one. That fixes the problem once and forever. Continuing struggling with a polarized cap is just nonsense to me, whichever their reason for doing that. Dario -- 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: Lens rear caps - Pentax vs. non-Pentax (Question)
From: Igor Roshchin The rear lens cups for Pentax and Tokina lenses are made so that can be attached in all three angular orientations (corresponding to the three tabs). I have a Tamron lens (70-300) that has a cap that is polarized, and can only be attached in one position. Just recently I discovered that several Sigma lenses come with the same sort of rear caps. So, the question is why do they polarize the cap? It makes it so much more inconvenient to put the cap on with one hand... Any insights? With the Sigma lenses it's because Sigma uses a K-mount bayonet that's rotated 120 deg for their own lens mount. I don't know why the polarized rear lens cap matters, because standard Pentax rear lens caps fit Pentax mount Sigma lenses. But, I don't know if Pentax rear caps would fit Sigma mount lenses, because I don't have any Sigma mount lenses. Do the polarized Tamron caps indicate another position for another brand's mount? I've got one Tamron lens, so I've probably got a Tamron rear lens cap around somewhere, but I expect it's relegated to my junk drawer back in Raleigh. I'm trying to replace all my rear lens caps with a specific Pentax rear lens cap. Pentax made a rear lens cap that looks like a hat with a brim and those are the best fitting rear lens caps I've ever found for Pentax K-mount lenses, whoever the manufacturer is. http://preview.tinyurl.com/4m8ulxb They don't seem to jar loose like other rear lens caps do. Only problem is it's kind of expensive to replace all of your rear lens caps with the good ones and I haven't quite managed to afford it yet. It's another one of those things I always look for whenever I find a still operating independent camera store - do they have old Pentax rear lens caps stashed away? I've been able to get them 3 for $10 that way instead of paying $11.00 apiece for them. - No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1191 / Virus Database: 1435/3385 - Release Date: 01/16/11 -- 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: Lens rear caps - Pentax vs. non-Pentax (Question)
2011/1/17 John Sessoms jsessoms...@nc.rr.com: Pentax made a rear lens cap that looks like a hat with a brim and those are the best fitting rear lens caps I've ever found for Pentax K-mount lenses, whoever the manufacturer is. http://preview.tinyurl.com/4m8ulxb Glad I'm not the only one with an Asahi/Pentax rear cap habit =) Cheers Ecke -- 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: Lens rear caps - Pentax vs. non-Pentax (Question)
On 17 January 2011 14:59, Igor Roshchin s...@komkon.org wrote: The rear lens cups for Pentax and Tokina lenses are made so that can be attached in all three angular orientations (corresponding to the three tabs). I have a Tamron lens (70-300) that has a cap that is polarized, and can only be attached in one position. Just recently I discovered that several Sigma lenses come with the same sort of rear caps. So, the question is why do they polarize the cap? It makes it so much more inconvenient to put the cap on with one hand... Any insights? Thanks, Igor Enjoying the 24mm then? Heh he heh :-) I'll say one thing for Sigma and Tamron caps: They're annoying, but they lock up damn well. I've bought 3rd party rear caps that won't latch on to Sigma lenses (but work OK on Pentax branded ones), so there's a 1/4mm difference in there somewhere that annoys the hell out of me. In the end, I just use Sigma caps for my Sigma lenses and curse while putting them on. —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: Lens rear caps - Pentax vs. non-Pentax (Question)
On Jan 18, 2011, at 9:46 AM, John Graves wrote: In the FWIW department, Leica bayonet caps go on any which way. It is not a REQUIREMENT that the Leica name be oriented correctly. But fellow Leicaphiles WILL notice. A bit like the correct way to position a tyre on a bicycle. If it has a logo or label on it, position it over the valve. Makes it slightly easier to find the valve, and bike snobs will see that you value good workmanship. Dave -- 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.
