S
Stu :)
Guest
Before I set upon one of my Canonet QL17's with my tool kit, I thought I might ask first...
The front lens element suffers from years of being cleaned and has a small collection of wipe marks. So I've decided to remove all the 'glass', strip off the current multi-coating, clean all the lenses in an ultrasonic bath with 10% Sodium Hydroxide and second IPA bath, then rise well in DI water. Then coat both sides of the front element and maybe one side of the rear element with a new multi coating and apply a hard coat (anti-scratch... to a point) to front of the front element.
...Also to add another spanner to the works, this going to be a test run for my even worse 50 year old Leica 50mm/2 Summicron.
Now I'm ok with disassembling and reassembling the lenses and the strip and cleaning process is an industry standard. What I'm concerned with is the possible changes to the optics. Would non-Canon/Leica MC on the lens have a noticeable effect? Or is it going only show up if one blow’s up part of the image more than necessary? Like those technical large format lens/heavy handed Zeiss books that blow up 1x1cm part of an 8x10 negative to a 20x20 print and get all mathematically excited over the different effects: in other words, would a B&W 16x12 print from 35mm negative look the same?
Thoughts? Anybody done this before???
Stu 🙂
The front lens element suffers from years of being cleaned and has a small collection of wipe marks. So I've decided to remove all the 'glass', strip off the current multi-coating, clean all the lenses in an ultrasonic bath with 10% Sodium Hydroxide and second IPA bath, then rise well in DI water. Then coat both sides of the front element and maybe one side of the rear element with a new multi coating and apply a hard coat (anti-scratch... to a point) to front of the front element.
...Also to add another spanner to the works, this going to be a test run for my even worse 50 year old Leica 50mm/2 Summicron.
Now I'm ok with disassembling and reassembling the lenses and the strip and cleaning process is an industry standard. What I'm concerned with is the possible changes to the optics. Would non-Canon/Leica MC on the lens have a noticeable effect? Or is it going only show up if one blow’s up part of the image more than necessary? Like those technical large format lens/heavy handed Zeiss books that blow up 1x1cm part of an 8x10 negative to a 20x20 print and get all mathematically excited over the different effects: in other words, would a B&W 16x12 print from 35mm negative look the same?
Thoughts? Anybody done this before???
Stu 🙂
