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11-13-2011, 02:30 PM   #1
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Sample images taken with C-mount lenses

If you have any, please share. I saw a lot of talk of adapters as well as photos of C-mount lenses mounted on Q cameras, but no sample images. Are they usable or do they just look cool on the camera?

11-13-2011, 03:27 PM - 1 Like   #2
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A guy named Ken aka nkenji is trying various lenses on various Pentax bodies, among which two C-mount lenses on his Pentax Q:

- P. Angenieux 8-64mm f/1.9
- Kodak Cine Ektar 15mm f/2.5

His gallery: Flickr: nkenji's Photostream. You can download 2,048 x 1,536 jpegs.

An easier way to access directly to the pictures taken with these two lenses (but linked pictures are 1,024 x 768):

Bagues adaptatrices pour Pentax Q - Angenieux 1/2 and Bagues adaptatrices pour Pentax Q - Angenieux 2/2 for the Angenieux and Bagues adaptatrices pour Pentax Q - Kodak Cine Ektar for the Kodak

In addition, DCWatch have reviewed various C-mount (and D-mount) lenses with the Q:

- (Pentax) Cosmicar 6mm f/1.2
- Kern Paillard Switar 25mm f/1.4 RX
- P. Angenieux 75mm f/2.5
- (Pentax) Cosmicar 9mm f/3.4 (pinhole lens)

The review (in Japanese):
PENTAX Q‚ƒ}ƒEƒ“ƒgƒAƒ_ƒvƒ^[‚ŽŽ‚iƒ€[ƒr[ƒJƒƒ‰ƒŒƒ“ƒY•ҁj - ƒfƒWƒJƒWatch. You can download full size jpegs.

Another way to access directly to the pictures taken by DCWatch, with comments in French (maybe easier to read than trying to decipher Japanese?): Bagues adaptatrices pour Pentax Q - DCWatch and C-mount lenses and the four subsequent posts. The links provided (click on thumbnails) lead to the full size jpegs.
11-13-2011, 08:55 PM   #3
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Here's some I posted form a Kern Palliard 1.6

https://www.pentaxforums.com/forums/pentax-q-forum/164053-pentax-q-kern-swita...-1-6-lens.html
11-13-2011, 11:43 PM   #4
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Thanks. I wish the aperture used for each shot would be available. I am wondering what the IQ of C lenses is wide open. So far, the most impressive results I've seen from lenses mounted on the Q were from K mount lenses. Was looking at the specs of one C mount lens and they were claiming it's designed to produce great results even on <gasp> 1.6MP sensors - yes, 1.6, not 16. Obviously, this isn't the kind of statement that generates confidence in using these lenses on a 12MP sensor.

11-15-2011, 12:50 AM   #5
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This isn't my summary, but I feel pretty much the same:

Lens Porn!: Pentax Q and C-mount Lenses = A predictable disappointment!
11-15-2011, 01:33 AM   #6
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Well, i think one must be prudent with general statements.
In my opinion the Pentax 16/1.4 and the Navitar 50/0,95 give quite acceptable results as soon as stopped down a bit (respectively f/2.8 and f/2). They happen to give "soft lenses effects" wider, which is not unpleasant either...
05-23-2013, 06:38 AM   #7
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This was taken with the Q10 and the very common (at least, on eBay) 25mm f/1.4 C-mount lens. I don't think the quality is at all bad for a lens that cost less than 30 pounds including the adapter. Certainly not a neutral, high image-quality lens, but good enough and with a character to it.



Last edited by NeilGratton; 05-23-2013 at 06:48 AM.
05-23-2013, 07:05 AM   #8
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QuoteOriginally posted by Laurentiu Cristofor Quote
I am wondering what the IQ of C lenses is wide open.
That really depends on the lens more than the mount. I'd say that I've not seen any lens that does conventional IQ (sharpness, contrast, distortion) better on the Q than the 01 prime, however, if you are considering Image Qualia, the unique characteristics of particular lenses, then there is a lot to explore with C (and D) mounts. What one might want from a 'character' lens is a very personal thing, so I don't really know what to recommend. However, many machine vision c mounts allow for narrow depth of field at reasonable distances, and the potential for extremely close range focusing (say a few centimeters). Old cine lenses often have pleasing bokeh and flattering 'softness' and low contrast. Maybe not what one wants for a shot, but they have the kind of character that you can't really replicate in post processing starting with a more 'perfect' image.

I wouldn't be too worried about how many megapixels the specs of a lens mentions. For new ones, just look for the ones labeled 'high definition'. I don't think anybody writes spec sheets with megapixel / sensor size ratios like the Q has.

Another thing is that many C mounts are easier to handle manually than the Q lenses.

All the pix in this post were shot with various C mounts: https://www.pentaxforums.com/forums/pentax-q/172196-lets-share-shots-q-143.html#post2340578


Last edited by verdigris; 05-23-2013 at 07:10 AM.
05-23-2013, 07:30 AM   #9
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Not quite a C-Mount, this one is a Kodak Ekton SVS Zoom Lens 9~27mm f/2.0
I was unable to identify the original bayonet mount, possibly it is a NASA mount.
The aperture was orinally controlled by the camera, so for now I have just fixed it at about f/5
I made an M43 mount for it on the lathe. The lens does not cover M43, its circle is about 16mm
Would that cover the Q?

This quick shot in the dull light today 21 mm and f/5 iso 640 1/20 sec with shake reduction on, a tungsten lamp is on the side.
Cropped so there is not too much vignette showing.
Attached Images
View Picture EXIF
E-PL1  Photo 
05-23-2013, 04:41 PM   #10
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The Schneider Kreutznach Cinegon 1:1.9/11,5 is quite nice but a bit clumsy and heavy. Still fun to use though!
Schneider Kreuznach 1.9/11.5 Cinegon c-mount - a set on Flickr
05-30-2013, 01:02 PM   #11
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While none of the C-mounts I've used has quite matched the 01 Prime, they've certainly been better than the 02 zoom, and honestly some of the C- and D-mount lenses have been sharper than even the SMC Takumar 50mm 1.4 (M42). See this 25mm Cosmicar, for example, or the Takumar 1.4 versus a Bausch & Lomb 50mm C-mount. Or my favorite D-mount for sharpness, the Elgeet 38mm. The whole set of Q lens tests is at Q Lens Tests - a set on Flickr

The key to doing well with cine lenses, I think, is to avoid the cheap ones sold for security cameras, and go for classic 8mm/16mm movie film lenses.
06-07-2013, 10:20 AM - 1 Like   #12
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QuoteOriginally posted by Travis Butler Quote
While none of the C-mounts I've used has quite matched the 01 Prime, they've certainly been better than the 02 zoom, and honestly some of the C- and D-mount lenses have been sharper than even the SMC Takumar 50mm 1.4 (M42).
Something you're not taking into account with the basic test shot your using is that all of these lens are designed with different 'sweet spot' focal ranges. It's not reasonable to expect a SMC tak 50 mm 1.4 (normal lens) to be as sharp at infinity as a quality cine telephoto like the elgeet 36 mm. The tak's best range is within 10 feet or so.

Trying to outdo the sharpness/contrast IQ the 01, or get similar quality on the cheap with c-mounts (and d mounts) is not likely to happen. But you can get pretty well close, and with improved features in other ways. Such as better low light performance, narrower DoF, or closer minimum focusing distance. There is also the huge range of character or qualia differences between lenses. With quality cine lenses the Q is a pretty good as a digital 16 mm / 8 mm movie camera replacement so long as you're not considering all organic qualities of film and alternate processing, but are rather just going for a 'classic movie look.'

Here is a link to a bunch of adapted lens images I prepared to share. I'm not going to point out what lens it what image, but just wanted to provide a wide view of the kinds of images that are uniquely possible with adapted lens that emphasis the character differences in real photos rather than test shots.

Adapted lens pictures

Just click on the image to continue.
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