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04-16-2011, 09:30 AM   #1
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Casio 50/2 K-mount lens - anyone knows?

Hi all, has anyone ever seen this lens? I bought it today at a flea market and was amazed because I never knew Casio ever made SLRs yet alone in the K-mount. Am not on my computer right now so I cannot post pictures but the thing seemed really sharp wide open. On par with my F50/1.4 at the same aperture (2)

04-16-2011, 01:07 PM   #2
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Please post a picture of it. Appears to be pretty rare.
04-17-2011, 12:46 AM   #3
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ok, I cannot connect the sd card from my DSLR to the computer, so I snapped a few cell phone pictures, hopefully of sufficient quality.





04-17-2011, 01:08 AM   #4
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The design points to a Cosina-made lens.

Interesting name variation. So there should be a Casio SLR also?

04-17-2011, 01:15 AM   #5
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Well, my extensive googling revealed several people mentioning having a casio SLR but nothing really specific, camerapedia doesn't know either. Cosina, will look into that, already have the revuenon 55 1.2 which has the same lettering. I was also looking at rikenons in the lens database and they look similar.

EDIT: Having looked at the lens database, it definitely seems to be Cosina made. The only difference being not having the small sphere on the right side of the aperture ring. (What is it anyway? keep seeing it on a lot of pentax lenses).

However, contrary to the one review there, it seems very sharp wide open (need to review on the computer screen to be sure, but from the camera's display, it certainly looks sharp)

Last edited by atiratha; 04-17-2011 at 01:21 AM.
04-17-2011, 03:11 AM   #6
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There was a Casio SLR called the RF2. It was sold with a 50mm f2 lens possibly the one that Atiratha picked up. The Casio Exilim series compacts also had Pentax lenses. Quite possibly its a rebadged Pentax lens that he has, similar to the samsung ones. The RF2 appears to be exceedingly rare as is the lens.
04-17-2011, 03:46 AM   #7
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Thanks Selar! Picking up your trail, I also found the RF3 camera to exist. Seems they were indeed k-mount. Good to know. How this lens in its almost mint condition wound up on a flea market in Czech Republic (Casio probably wasn't sold here during the cold war) is a puzzle to me.
04-17-2011, 04:33 AM   #8
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Casio RF-2 – Isti's Blog

This blog post shows pictures of the RF2 with your lens mounted on it. No contacts on your lens or the body. Could it be the M 50/2 in disguise?

04-17-2011, 04:52 AM   #9
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That was my though too, the coatings look similar, the body design, however points more to Cosina. I snappet a few more snapshots and must add that apart from this lens being amazing wide open, it actually doesn't get any better than this, only the DOF increases and corners improve, whereas the reviews of M50 suggest it being soft wide open.
04-17-2011, 11:15 AM   #10
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Sooo, I imported my yesterday's comparison shot with F50/1.4 and very surprisingly, the Casio beats it at the same aperture (F2)

The Pentax exhibits lots of various fringing issues and the resolution seems on par (no tripod, exact shot couldn't be made). Please note that the focus point is probably slightly different so there are places where pentax is better and places where casio is better.

see the comparison

Nevertheless, the casio yields impressive resolution wide open, seems to be a real gem!
04-17-2011, 12:22 PM   #11
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The cosmetics on the Casio RF-2 camera body look the same as some Chinon manual focus K-mount camera bodies. Chinon made their own (well-regarded) lenses, but I haven't compared the cosmetics of that Casio lens with the equivalent Chinon yet...
04-17-2011, 01:03 PM   #12
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Blown margins.....hate scrolling.....

In the future, please use the [imgwide] tag.
04-17-2011, 02:26 PM   #13
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QuoteOriginally posted by selar Quote
Casio RF-2 Isti's Blog

This blog post shows pictures of the RF2 with your lens mounted on it. No contacts on your lens or the body. Could it be the M 50/2 in disguise?
No, the focus ring turns the "wrong" way.
04-18-2011, 01:05 AM   #14
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QuoteQuote:
EDIT: Having looked at the lens database, it definitely seems to be Cosina made. The only difference being not having the small sphere on the right side of the aperture ring. (What is it anyway? keep seeing it on a lot of pentax lenses)
The sphere is the tactile equivalent to the red dots. Line up the bump with the lens release to mount the lens without looking.:ugh:
04-18-2011, 01:07 AM   #15
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Wow, thanks for that info, I never realized it could be for this purpose. Too bad, they don't do it anymore
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