28mm exhibits bizzare habit

[venchka]

Lens Doctor Diagnosis

Lens Doctor Diagnosis

I took the lens to the repair shop. Quick answer: fungus. "The horror" A legacy of disuse and a lifetime in New Orleans. :bang:

My repair man is optimistic that the affliction can be repaired. I took all of my other lenses out of their cases or bags and spread them out on a well ventilated shelf.

Thanks again for all of your help.

 

[peter_n]

Wow. Good luck! Thanks for posting back...

 

[Ronald M]

Look at the negs with a 50mm lens as a loupe. If they look ok, the scanner operator lingered too long on some frames and caused the neg to pop.

I the negs are bad, I would look for something changing like a loose element.

Outside chance the film is not always flat in camera. Humidity will cause this if you change lenses.

My money is on the scanner.

 

[venchka]

Different bodies, different film, same results

Different bodies, different film, same results

Look at the negs with a 50mm lens as a loupe. If they look ok, the scanner operator lingered too long on some frames and caused the neg to pop.

I the negs are bad, I would look for something changing like a loose element.

Outside chance the film is not always flat in camera. Humidity will cause this if you change lenses.

My money is on the scanner.

3 more pictures to illustrate why I know the lens is at fault. I do agree that an element may be loose or out of alignment. That possibility is being checked while the lens is apart to try to rid the interior of fungus.

#1 Water: Komura 28mm, Canon VI-T, HD 200 film
#2 Deck: Nikkor 50mm, Canon VI-T, HD 200 film
#3 Dragonfly: Leica 50mm DR Summicron, Leica M5, Ultra 100 film

The water scene and deck scene were from a roll of film I shot in April-May. The water scene was my first clue that I had a problem with the Komura 28mm lens. The picture of my deck was taken with a Nikkor 50mm f:1.4 lens. Canon VI-T body. Same roll of film. Same weekend.

The rusty dragon fly picture is from the recent roll of film. The same roll of film as the first pictures at the beginning of this thread. 50mm DR Summicron, M5 body.

The only pictures from both rolls that show any flaws are the ones taken with the 28mm Komura. So far in this thread I have offered examples from 3 different lenses, two bodies & two seperate rolls of film. I concluded that there is something wrong with the Komura lens. I am optimistic that the problem can be corrected. A replacement will be very expensive.

Thanks again for everyone's help.

 

[John Robertson]

I had a similar problem with a new 28mm Ricoh lens in LTM (the same one as in the GR 1, in 2001. Drove me nuts, I took it back to the place I bought it from, turned out it was a partial balsam separation of two cemented elements. Looking through the lens I could not see the problem, but their engineer had come across the situation before and recognised the fault. I replaced it with the 28mm Ultron, which has been fine. might be worth letting an engineer look at it.

 

[venchka]

It's back!

It's back!

I got the lens back yesterday afternoon. Quick turnaround-in late Monday, ready Thursday after lunch. I love my repair man! Complete disassemble, a shot of Roundup , and my fungus greenhouse looks like a new lens again. Hopefully it works as good as new. Film at 11.

 

[venchka]

It was just crudy!

It was just crudy!

The lens that is. It appears to have cleaned up real nice.

These are the after pictures. My version of the brick wall sharpness test.

Also, my first roll of BW400CN. The jury is still out.

 

[back alley]

i'd say it cleaned up pretty good.
joe

 

[peter_n]

Yep it looks good! You are lucky that it wasn't fungus.