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Cosina MC Cosinon-W 24mm f2.8

Reviews Views Date of last review
2 28,065 Wed July 9, 2014
Recommended By Average Price Average User Rating
100% of reviewers $40.00 9.00
Cosina MC Cosinon-W 24mm f2.8

There is more than one cosina 24mm. This review page is for the Cosinon-W, which with a black anodised mount (needs sanding to enable green button stop-down metering) seems to be an earlier version.

Cosina MC MACRO 24mm reviewed here.

49mm/ filter thread,
5 aperture blades,
weight 166 gr,
anodized aluminium bayonet
Mount Type: Pentax K
Price History:

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New Member

Registered: February, 2012
Posts: 15

1 user found this helpful
Lens Review Date: July 9, 2014 I can recommend this lens: Yes | Price: $30.00 | Rating: 9 

Pros: Inexpensive, sharp from wide open, compact
Cons: Focus ring a bit lumpy, no A setting.
Sharpness: 10    Aberrations: 9    Bokeh: 8    Handling: 8    Value: 10    Camera Used: Samsung GX20, Pentax K-x   

If you want to know what this lens looks like, see - just imagine 35 replaced with 24 on the vanity ring.

The handling characteristics of the two lenses likewise is identical down to the slight 'stickiness' when I try to start moving the focus ring.

Green button metering works on the GX-20, but is useless on the K-x, because the (metal) mount is anodised. I am not inclined to attack the mount with sand paper to fix this. On the K-x, I use the 'Sunny 16' rule first off, and then consult the histogram.

Colours and contrast are good, there is little distortion, and there is a little bit of CA. Bokeh, when there is any, lacks character, but doesn't offend.

The lens isn't resistant to flare. Using a hood all the time (I use a collapsible rubber) helps, but if the sun is in the frame the captured image is likely to be useless.

The lens is sharp wide open, and gets sharper stopped down, in the centre and the corners. There can be a little bit of fringing. I don't notice any distortion.

I think the Cosina has a slight edge in sharpness over the Tamron 17-50mm f2.8 Zoom at any aperture, though the differences are slight. However, the Tamron Zoom copes much better with flare, shows no fringing, and its colours are more pleasing. At f8, I find there is little to choose between the Cosina, the Tamron 17-50mm f2.8, and the Tamron SP 24-48mm f3.5-3.8

I find the Tamron 01B 24mm f2.5 to be, in comparison:
  • More easily focused; the difference between f2.5 and f2.8 makes a big difference to me in the brightness of the view finder.
  • Much nicer to handle; the Tamron focus ring is perfectly damped.
  • Markedly bulkier; 55mm filters versus 49mm, and the Tamron prime is scarcely smaller than the Tamron SP 24-48mm f3.5-3.8 zoom
  • Less sharp in the corners when I pixel-peep.
I have also compared the Cosina to the SUN YS-24 f2.8, and the Tokina TX 24mm f2.8 Mark 2, and at f8 I get obviously better results with the Cosina in the corners. Recommended.
Junior Member

Registered: March, 2012
Posts: 37

2 users found this helpful
Lens Review Date: February 20, 2013 I can recommend this lens: Yes | Price: $50.00 | Rating: 9 

Pros: cheap, light, small, sharp, low distortion
Cons: cheap, not very durable construction, flare
Sharpness: 8    Aberrations: 8    Bokeh: 8    Handling: 7    Value: 9   

Perhaps a bit underrated lens. Usual cheap Cosina build; aluminium + plastic. No-fuss design really, looks like 1000 other similar lenses and handles so too.

Optical price-performance is really good, compared to Tamron 24mm f:2.5, this one is sharper, with less distortion and flare.

At f:2.8, corners are a bit softer than the center, while that center portion is very good. Stopping down improves things as usual, at f:8 it's very sharp corner-to-corner.

There's some CA, but quite low I'd say.. + NO ghosting/highlight "glow" (the Tamron for example, glows quite a lot @ f:2.5-2.8). Overall, a very nice "street" lens, can still be said to be wide-angle on APS-C (about 37mm equivalent on Pentax).
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