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Sigma 18mm F2.8 in m42 mount, some test pics
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PostPosted: Fri Aug 27, 2010 2:13 pm    Post subject: Sigma 18mm F2.8 in m42 mount, some test pics Reply with quote
Got this lens recenly from ebay, just of curiousity.

The apperture wouldn't close after F8. Had to repair it. Succeded, but couldn't do anything about a small defect - the blades wouldn't make a perfect hexagon with appertures f16-f22, which btw can affect sharpness and distorsion level.

While testing the lens I discovered that at F2.8 it's very soft (can be used for soft effect though) and serious vingetting in the corners.
It's also quite a good performer at f4-f8.
The bokeh is nice and pleasant for a 3rd party lens, but no sample here.

At the time I don't rly need such a wide lens and decieded to sell it.

Made a test, which could be usefull for others.

Shot with eos 550d (T2i) using a tripod. Just RAW->Jpeg conversion in Capture one, no resize.

Focusing on the house being built

@F2.8: http://kvolkov.com/img/lenses/Sigma_18mm_f2.8_m42/F2.8_Sigma_18mm_f2.8_m42.jpg

@F4: http://kvolkov.com/img/lenses/Sigma_18mm_f2.8_m42/F4_Sigma_18mm_f2.8_m42.jpg

@F5.6: http://kvolkov.com/img/lenses/Sigma_18mm_f2.8_m42/F5.6_Sigma_18mm_f2.8_m42.jpg

@F8: http://kvolkov.com/img/lenses/Sigma_18mm_f2.8_m42/F8_Sigma_18mm_f2.8_m42.jpg

@F11: http://kvolkov.com/img/lenses/Sigma_18mm_f2.8_m42/F11_Sigma_18mm_f2.8_m42.jpg

@F16: http://kvolkov.com/img/lenses/Sigma_18mm_f2.8_m42/F16_Sigma_18mm_f2.8_m42.jpg


And some pictures of the lens:
http://kvolkov.com/img/lenses/Sigma_18mm_f2.8_m42/Sigma_18mm_f2.8_m42_1.jpg
http://kvolkov.com/img/lenses/Sigma_18mm_f2.8_m42/Sigma_18mm_f2.8_m42_2.jpg
http://kvolkov.com/img/lenses/Sigma_18mm_f2.8_m42/Sigma_18mm_f2.8_m42_3.jpg
http://kvolkov.com/img/lenses/Sigma_18mm_f2.8_m42/Sigma_18mm_f2.8_m42_4.jpg
http://kvolkov.com/img/lenses/Sigma_18mm_f2.8_m42/Sigma_18mm_f2.8_m42_5.jpg
http://kvolkov.com/img/lenses/Sigma_18mm_f2.8_m42/Sigma_18mm_f2.8_m42_6.jpg


PostPosted: Fri Aug 27, 2010 3:07 pm    Post subject: Reply with quote
Looks like a winner after looking at some of the samples which are as large
as a king size bedsheet. Wink


PostPosted: Fri Aug 27, 2010 4:53 pm    Post subject: Reply with quote
Katastrofo wrote:
Looks like a winner after looking at some of the samples which are as large
as a king size bedsheet. Wink


For it's price definetly yes! Around 90 euros.


PostPosted: Tue Aug 31, 2010 10:16 am    Post subject: Reply with quote
Also the lens has very nice bokeh.

Here's the fullsize sample:
http://s50.radikal.ru/i128/1008/ec/ed9a4c25d833.jpg




PostPosted: Wed Sep 01, 2010 3:24 pm    Post subject: Reply with quote
wide angle + shallow dof looks amazing!
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