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Help me ID the lens - Pentax/Cosmicar 25mm f1.9
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PostPosted: Mon Nov 19, 2012 8:45 pm    Post subject: Help me ID the lens - Pentax/Cosmicar 25mm f1.9 Reply with quote

Bought this one described as "Lens for m4/3". It turned out to be a c-mount on c->m4/3 adapter. The top of the lens has been cut off, to turn it into a true pancake (total height is about 2cm). This also got rid of any ID's. Judging by FOV it's 25mm f1.9 lens. Aperture ring closely resembles Contax G in style. 5 bladed clickless aperture f1.9-f16, original MFD was 60cm, after modification it's about 30cm. Does anyone have any idea what it was?


#1

#2


Last edited by fermy on Mon Jan 27, 2014 8:01 pm; edited 1 time in total


PostPosted: Mon Nov 19, 2012 10:42 pm    Post subject: Reply with quote

Now that is a wierd one. Smile


PostPosted: Mon Nov 19, 2012 11:19 pm    Post subject: Reply with quote

Looks like this is Cosmicar http://www.mu-43.com/f17/cosmicar-tv-25-1-9-c-mount-lens-location-usa-ships-usa-can-35353/
See here its 50mm sibling Click here to see on Ebay


PostPosted: Mon Nov 19, 2012 11:27 pm    Post subject: Reply with quote

Bingo! I already have a couple of 1.9/25mm Cosmicars, but they are different style:


The optics is probably the same though, as both have deeply recessed front element.


PostPosted: Mon Nov 19, 2012 11:40 pm    Post subject: Reply with quote

Ooh, a Pentax, I wonder if it will cover a NEX sensor?


PostPosted: Mon Nov 19, 2012 11:52 pm    Post subject: Reply with quote

Not completely. There is a very slight vignette on m4/3 sensor, slightly larger one on NEX. I'll snap a sample picture on NEX to show the coverage.


PostPosted: Tue Nov 20, 2012 7:25 pm    Post subject: Reply with quote

Looks like a sawed-off C-mount lens. Where did you find it? Very Happy


PostPosted: Tue Nov 20, 2012 8:25 pm    Post subject: Reply with quote

Yep, sawed off Cosmicar 1.9/25. Found it on German ebay.


PostPosted: Wed Nov 21, 2012 5:56 am    Post subject: Reply with quote

not much evidence left to go on...


PostPosted: Fri Nov 23, 2012 1:58 am    Post subject: Reply with quote

To me the pictures that dimitrigo linked to are very convincing, especially coupled with matching speed and FL and very deeply recessed front element (similar to many 50mm macros). Personally, I have no doubts now that it's Cosmicar 1.9/25mm.

Here are some sample pictures on NEX and EPL-1. First NEX:

#1 Wide open or close to it


#2 NEX, uncropped.


#3 Crop of the above


#4 NEX, uncropped



#5 Crop of the above


#6 NEX, uncropped


Now EPL-1 on a truly gloomy autumn day. The light was awful.

#7 EPL-1, uncropped. Vignette is almost nonexistent.

#8

#9 EPL-1, ISO 2000


Edit: re-uploaded the images lost in the server crash.


Last edited by fermy on Tue Oct 14, 2014 1:31 pm; edited 1 time in total


PostPosted: Fri Nov 23, 2012 2:09 am    Post subject: Reply with quote

the cropped from NEX is really nice


PostPosted: Mon Jan 27, 2014 7:58 pm    Post subject: Reply with quote

These days whenever I get my hands on NEX, it is immediately confiscated by the subject of this photo. So I keep this Cosmicar as a body cap, because it's light, cheap and has a recessed front element. Ohh yeah, and it can take pictures too Wink ...