Got my fisheye yesterday!

Started Jan 19, 2013 | Discussions thread
clengman
Senior MemberPosts: 1,297Gear list
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Re: Got my fisheye yesterday!
In reply to stefano888, Jan 19, 2013

stefano888 wrote:

It is a very nice lens!

In the second pic you write "f/3.5 inverted" and then in the 4th pic "f/5.6 inverted".

What do you mean with "inverted": upside down?

I think your copy is sharp...

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stefano-italy

The "inverted" photos are a quick test that I've seen Detail Man and Anders recommend to check for lens asymmetry. Take one photo with the camera upright and another photo of the same scene without changing focus holding the camera upside down. Then compare sharpness in the corners. Any problem with collimation of the lens elements will show up as a lack of sharpness in opposite corners in the two photos.

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Olympus PEN E-PL1 Olympus M.Zuiko Digital ED 14-42mm 1:3.5-5.6 Olympus M.Zuiko Digital ED 40-150mm 1:4-5.6 Rokinon 7.5mm 1:3.5 UMC Fisheye CS +4 more
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