Fixed the Cosmicar 8mm

ahuyevshi

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Not bad at all.....

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ahuyevshi

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Feb 9, 2010
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Same exact lens... Grinded the hell out of the mount with dremel.... for 30 bucks I really didn't take too many precautions... Apparently as Kai pointed out the aperture marking being perpendicular to the hotshoe is way off... This thing needed to turn 1/2 turn further.. As such the aperture marking is directly the bottom.

The shot above was 3 seconds at F/11

Here is a pic of the lens

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wilson.c

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Mar 1, 2010
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Ouch! for the lens!! I just lost out on a 25mm last night on evilbay. Think it went for $49. I was looking for around $20-30 range. I would have taken it to my trusty machinist to help me cut down the edges. Be glad they did not use stainless steel in those days ;-)
 

PeterB666

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Jan 14, 2010
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Peter
Is that a cropped and doctored image. Hard to believe no vignetting from a 8mm c-mount lens.

P.S. I have never seen a cut-down job with as much 'character' as that.
 

ahuyevshi

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It's cropped of course... Lol ;) You should see what I can do with a clutch :)

Out of camera.. only cropped.. You get reasonable 1600x1600 shots.. Which are fine for 5x5 prints... I wouldn't go any higher...

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cosinaphile

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Dec 26, 2009
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new york city
impressive , i do alot of dremel modifications but never a c mount lens , i used a dremel to modify my case with a 90 mm contax g mount len and to make an ebony grip also to remove stubborn lenses from 110 minolta zoom cameras , etc do you have a pic uncropped, im curious how much larger youve made the image circle with the deeper recessing vs the images in the other thread
 

laptoprob

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Jan 28, 2010
Messages
52
So how wide does it compare to? Taking the vignetting in account? I have a 12,5 Meopta something, produces almost a full round circle. A rectangular cutout would be like 24mm Iirc. That's why square is a good way to use these lenses.
 

ahuyevshi

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Feb 9, 2010
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Berkeley, CA
Cosina, I'll upload some tonight... I set the camera to 6x6 and there wasn't much to crop.. Given the 6x6 is just digital crop anyway... I'll take a full size tonight for comparison..

Laptopprob, I honestly don't know.... Even in what's in view I't still seems wider than my CV 15mm...
 

ahuyevshi

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Feb 9, 2010
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Berkeley, CA
This thing is Stupid Wide in the available fov... I was standing across the street was able to get a 30 story building.. Will post tonight
 

kai.e.g.

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Dec 15, 2009
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Friuli-Venezia-Giulia, Italy
Well done!! I knew you'd get there eventually. The rear end of your lens is... how can I put this gently and diplomatically? Oh, I know: Butt Ugly!! :rofl: But who cares what it looks like back there; you never see it while it's mounted, and the fantastic image results speaks loudly!
 
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