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Old 05-29-2019   #41
BenCviolin
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Has anyone had success in DIY repair of the white spots ?
I was thinking (as mentioned earlier in this thread) of cutting (using a grinder) the metal crimp which holds the front element in place.
I have two of these lenses, both same problem.
Another lens I have is Kowa Six 55 f3.5, which has Schneideritis too, same metal crimp which holds front element in place.

Thing is, if the metal crimp is ground off (very) carefully then the front element should just pop out for cleaning, and then it could be rehoused.
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Old 05-30-2019   #42
kuuan
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Hi Ben, ^ right!
Schneideritis on my copy was rather severe:


Minolta M-Rokkor f2.8/28mm
by andreas, on Flickr

IQ was impacted, specially handling of highlights and looking hazy


Untitled
by andreas, on Flickr, Ricoh GXR M


grandpa
by andreas, on Flickr, Sony A7


therefore I decided to clean the front glass, in the end used cerium oxide. The glass looks quite clean now
( if anyone wants I shall take and show a photo of the lens after cleaning )

Handling of highlights is a bit improved, still critical but it's not "blooming" as much. A few samples:


traditional weaving
by andreas, on Flickr, Sony A7



Untitled
by andreas, on Flickr, Sony A7

colors, generally, are "special", a bit weird, but striking too. Not sure if I like them, would say that depends on the subject.


traditional coffee farmer house
by andreas, on Flickr, Sony A7

strong highlights are still quite problematic:


Phương Quỳnh
by andreas, on Flickr, Sony A7

not only the white points, after cleaning with cerium oxide, entire coating must be gone.
- If anybody knows of a service that does coating for rel. little money please be so kind and let me know

here all the photos that I have taken with this lens: https://www.flickr.com/photos/kuuan/...57644175227413
first to be seen photos taken 'after' cleaning, the last 15 or so 'before'

cheers, andreas
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