jlancasterd Posted October 3, 2006 Share #1 Posted October 3, 2006 Advertisement (gone after registration) Did anyone who attended Photokina think to ask whether it is possible to get the 6-bit coding applied to screw-thread lenses that have been fitted with screw-bayonet adapters? Quote Link to post Share on other sites More sharing options...
Advertisement Posted October 3, 2006 Posted October 3, 2006 Hi jlancasterd, Take a look here Coding bayonet-adapted screw-thread lenses. I'm sure you'll find what you were looking for!
cbretteville Posted October 3, 2006 Share #2 Posted October 3, 2006 John, Leica's has published list of lenses they offer coding for, they are all M-lenses no LTMs. They'd run out of numbers, 6 bits can only do 64 numbers and I expect they want to save some for future use. There are some 30 odd lenses on that list already from the 70's and up to today and they write that some of the M-lenses as far back as 1963 can be coded, but dosen't list any as far back as that. - Carl Quote Link to post Share on other sites More sharing options...
wparsonsgisnet Posted October 3, 2006 Share #3 Posted October 3, 2006 If they were to do this, I would think that you'd have to have an adapter for every screw lens. Don't the dots go on the bayonet fitting? Quote Link to post Share on other sites More sharing options...
jlancasterd Posted October 3, 2006 Author Share #4 Posted October 3, 2006 If they were to do this, I would think that you'd have to have an adapter for every screw lens. Don't the dots go on the bayonet fitting? Yes - the dots do go on the bayonet fitting - that's why I wondered if it might be possible to code some of the 1960s LTM lenses that were also produced in bayonet form by coding the adapter. Quote Link to post Share on other sites More sharing options...
wparsonsgisnet Posted October 3, 2006 Share #5 Posted October 3, 2006 John, this is a fun question. I believe you can email Leica about this. Anybody know the email address for a question like this? Quote Link to post Share on other sites More sharing options...
tobey bilek Posted October 9, 2006 Share #6 Posted October 9, 2006 I think we should all wait until it is decided by real photographers if it is necessary at all. Quote Link to post Share on other sites More sharing options...
wparsonsgisnet Posted October 9, 2006 Share #7 Posted October 9, 2006 Advertisement (gone after registration) When real photographers decide what's necessary I'll be able to sleep late. Quote Link to post Share on other sites More sharing options...
tobey bilek Posted October 18, 2006 Share #8 Posted October 18, 2006 The current issue of LFI explains it all. The are two metering cells, internal and external(blue dot). The camera figures the difference in light and therefore knows the f stop in use. Software then is able to adjust vignetting based on the the lens in use and f stop. It never over corrects. Smaller stops do not need correction. Large stops can be done manually after the fact. Therefore you need not code the lenses unless the software gets all screwed up not getting a lens code. There are programs that can correct vignetting after the fact, photoshop and PTLens for two. I use PTLens and it is just a matter of moving a slider and deciding the middle point of where there correction is to start, It takes less than a minute. PTLens cost $15. It also does lots of other stuff like correction zoom lens distortion and perspective correction. Comes in both plug in and stand alone. You get both for $15. Quote Link to post Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.