photo sharing and upload picture albums photo forums search pictures popular photos photography help login
Type your message and click Add Comment
It is best to login or register first but you may post as a guest.
Enter an optional name and contact email address. Name
Name Email
help private comment
mike earussi | profile | all galleries >> Galleries >> sigma_70mm_macro_test_on_sd15 tree view | thumbnails | slideshow
f2.8
f2.8		 f3.2
f3.2		 f3.5
f3.5		 f4
f4
f5.6
f5.6		 f8
f8		 f11
f11		 2x center crop test.jpg
2x center crop test.jpg
2x mag extreme right corner 70mm macro lens test.jpg
2x mag extreme right corner 70mm macro lens test.jpg		 f2.8
f2.8		 f3.2
f3.2		 f3.5
f3.5
f4
f4		 f5.6
f5.6

comment | share
mike earussi13-Jul-2012 04:57
The reason the exposure is the same in all the night shots was because I also wanted to see what the effect varying the exposure (via changing the f stop) would have on the sky and buildings.
mike earussi13-Jul-2012 04:45
The first test is for field flatness.

The second test provides information on two different characteristics of the 70 macro:
1. at what aperture the star pattern forms, and
2. purple fringing around bright lights, which seems to be gone by f5.6.
Type your message and click Add Comment
It is best to login or register first but you may post as a guest.
Enter an optional name and contact email address. Name
Name Email
help private comment
click on thumbnails for full image