goinggreynow
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Morning all
Any help very much appreciated.
I have a rather splendid & uncommon (or it used to be splendid) Petri 28mm F2 lens on a Pentax mount.
I bought it with some other Pentax bits afew years ago and put it in the cupboard. Went to use it and noticed some fungus/dirt and so sent it off for a professional clean.
In the post, on the way back to me, the front element was smashed. Completely unuseable.
Given that Petri lenses are not 'ten a penny', my digging revealed that Cosina probably made the lens and it may be a re-badged Cosinon-W. I cannot be sure though.
My plan (if it can be called that) is to see if I could pick up a broken/dusty/for repair Cosina and use it as a donor for the front element.
My problem is I have no idea if the Petri/Cosinon connection is correct and whether it has to be a F2 donor lens or whther I could get away with a F2.8 (much more common).
Common sense tells me that the F2 front element will be larger in size than a F2.8 but now I'm starting to question myself.
Are there any fellow member who have a Cosina/Cosinon-W 28mm lens and would be willing to measure the diameter of the front glass - from the inside of the retaining ring (or beauty ring - whatever its called)?
If the internal width is about the same as mine, then I may just take a punt one one at auction.
Thanks for any help.
Any help very much appreciated.
I have a rather splendid & uncommon (or it used to be splendid) Petri 28mm F2 lens on a Pentax mount.
I bought it with some other Pentax bits afew years ago and put it in the cupboard. Went to use it and noticed some fungus/dirt and so sent it off for a professional clean.
In the post, on the way back to me, the front element was smashed. Completely unuseable.
Given that Petri lenses are not 'ten a penny', my digging revealed that Cosina probably made the lens and it may be a re-badged Cosinon-W. I cannot be sure though.
My plan (if it can be called that) is to see if I could pick up a broken/dusty/for repair Cosina and use it as a donor for the front element.
My problem is I have no idea if the Petri/Cosinon connection is correct and whether it has to be a F2 donor lens or whther I could get away with a F2.8 (much more common).
Common sense tells me that the F2 front element will be larger in size than a F2.8 but now I'm starting to question myself.
Are there any fellow member who have a Cosina/Cosinon-W 28mm lens and would be willing to measure the diameter of the front glass - from the inside of the retaining ring (or beauty ring - whatever its called)?
If the internal width is about the same as mine, then I may just take a punt one one at auction.
Thanks for any help.
