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Cosina Cosinon Auto 50mm F1.7

Reviews Views Date of last review
2 26,420 Mon August 24, 2015
Recommended By Average Price Average User Rating
100% of reviewers $12.50 9.00
Cosina Cosinon Auto 50mm F1.7

Cosina Cosinon Auto 50mm F1.7
Cosina Cosinon Auto 50mm F1.7

M42 mount
Auto-manual switch for aperture.
49mm filter threads.
Made in Japan
Mount Type:
Price History:

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New Member

Registered: November, 2013
Posts: 8

1 user found this helpful
Lens Review Date: August 24, 2015 I can recommend this lens: Yes | Price: $15.00 | Rating: 9 

Pros: excellent sharpness
Cons: very small CA's, some few flare wide open
Sharpness: 10    Aberrations: 9    Bokeh: 8    Handling: 8    Value: 9    Camera Used: k200 kx   

O/+ against the light some few flare wide open

+++ sharpness from f5.6 to 8 excellent because of 6/4 element construction

+/++ very small CA's wide open, disappearing if stopped down a few

++ nice color rendition

an excellent performer at very low costs

Highly recommended 8.5 points
Junior Member

Registered: January, 2013
Posts: 28

2 users found this helpful
Lens Review Date: June 20, 2013 I can recommend this lens: Yes | Price: $10.00 | Rating: 9 

Pros: Amazing Bokeh! Pretty sharp and excellent build quality!
Cons: Has CA issues wide open.
Sharpness: 8    Aberrations: 7    Bokeh: 10    Handling: 10    Value: 10   

This was my first vintage prime, picked it up along with a STL 1000 body for $25 shipped. (I've seen the lens sell by itself for $5-10 on ebay)

Cosina, the most underrated camera manufacture out there! They make bloody Carl Zeiss and Leica Voigtlander lenses for crying out loud but nobody knows!

They also made lenses and bodies for other manufactures like Nikon, Canon, Epson and Vivitar, yet they received no credit.

Onto the lens, this one is the older single coated M42 mount version. (not to be confused with the multi coated K mount version)

Pretty fast at F1.7, really awesome bokeh! It will even swirl it under the right conditions.

I was offered $200 once for this lens and turned it down(I should have taken it because copies of this pop up all the time on ebay)

It's decently sharp at f/1.7, but really sharp at 2.8.

Suffers from chromatic aberrations when shooting in direct sunlight(fixable in post), by F/4 it's mostly all gone.

Aperture is only rounded wide open, by 2.8 the six sides are noticeable.

Build quality is really similar to the modern Voigtlanders lenses they make for the Leica system, the numbers and focus ring look identical on some lenses!

Awesome feel and very nicely weighted

Great starter lens if you want to get into manual focus primes, I'm glad it was my first!

NOTE: lens was tested on a crop digital body(Canon 10D), have no clue how the edges perform on a full frame or on film.

UPDATE: since this review was written I have used it on a 7D and it performed just as nice, I also used it on a full frame 35mm EOS film body. It's even more stunning when used on full frame!

Did run into a problem, the mirror hit it when used at infinity. Not enough to make a big issue but it does hit it, I rarely ever use a 50mm at infinity so this was not a huge problem for me. (literally only used my lens at infinity once this whole entire year to give you a clue)

1.7 samples

Rocky by AlexxxCorona, on Flickr

Gigi by AlexxxCorona, on Flickr

Untitled by AlexxxCorona, on Flickr

Jonny Sniper by AlexxxCorona, on Flickr

With a Vivitar M42 2x teleconverter(still wide open):

Vivitar 2X1 test shot by AlexxxCorona, on Flickr

Reversed for macro at F8/F16(cant remember exactly):

Spider by AlexxxCorona, on Flickr

Full flick set with this lens:

Check out my blog!
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