Just got a couple CCTV lenses: a Computar and Canon

ronbot

Mu-43 Regular
Joined
Apr 27, 2010
Messages
98
Finally got some CCTV lenses and adapter; a Computar 12.5mm F1.3 and Canon 12.5-75mm F1.8. Here they are with the Panny 20mm for reference:
View attachment 148117
View attachment 148118

Here are sample shots to show the vignetting of both lenses using a 16x9 aspect ratio.
First, the Computar:
View attachment 148119

Next, the Canon 12.5mm:
View attachment 148120

Finally, the Canon at 75mm:
View attachment 148121

More sample pictures from the CCTV lenses at different aspect ration here.

The Computar had to be modified to be able to screw all the way into the adapter.

The Canon hasn't been modified, but it seems like it needs a quicky with Mr. Dremel to be able to focus to infinity at the wide end. Then again, maybe it is just the way it is as there is no focusing issue past the wide end and towards the tele end.

Despite the vignetting on both lenses, I'm having fun experimenting with them. At $25 each, can't really complain. Actually, the Computar is currently my widest and brightest lens, so I'm happy with it.
 

Krang

Mu-43 Veteran
Joined
Feb 19, 2010
Messages
202
That's pretty decent for a 12.5mm c-mount. Still a bit too much vignetting for me though…

I assume that the sample images are all aperture wide open?
 

JoepLX3

Mu-43 Top Veteran
Joined
Jun 13, 2010
Messages
509
Location
Japan
That's pretty decent for a 12.5mm c-mount. Still a bit too much vignetting for me though…

I assume that the sample images are all aperture wide open?
Nice shots and good question.
- How about comparison shot of widest vs most narrow aperture at both 12.5 & 75 mm?
 

ronbot

Mu-43 Regular
Joined
Apr 27, 2010
Messages
98
I assume that the sample images are all aperture wide open?
Totally forgot to mention it, but all shots were taken at F2.8 actually.

How about comparison shot of widest vs most narrow aperture at both 12.5 & 75 mm?
I'll post additional pictures when I can.
 

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