pgk Posted July 4, 2017 Author Share #21 Posted July 4, 2017 Advertisement (gone after registration) You need to adjust the 'relative' position of one group to another (such as with a floating group), but I can't remember how it fixes the issue as focus and aperture are independent of each other. I used to know why... Some manufacturers gave it names like CRC (Close Range Correction) which again deals with optical performance optimisation as the lens focuses closer - in essence a floating rear group similar to the FLE. But if I remember correctly, the difference between pre-FLE and FLE is essentially mechanical in that the rear group moves rearwards in the later lens as it focusses closer. I assume that part of the problem is focus shift and that the rear group moving compensates for this as focal length increases when the lens extends as it is used at closer distances. No doubt with more complex and larger lens designs and the use of electronics it will be possible to build even better optimising/correcting lenses in the future. In the meantime both my Summiluxes seem to produce very acceptable images .... Quote Link to post Share on other sites More sharing options...
Advertisement Posted July 4, 2017 Posted July 4, 2017 Hi pgk, Take a look here In praise of the 35mm Summilux aspheric pre-FLE at f/2.8 - focus shift?. I'm sure you'll find what you were looking for!
Stein K S Posted July 5, 2017 Share #22 Posted July 5, 2017 No problem with mine in any practical situation. I actually find this lens to ¨deliver¨ the most consistens quality of all my Leica lenses. While I have a couple of other favourite lenses, this 35 I will always keep! 1 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.