Wollensak EXWA 6" f/12.5 Image circle

What is the image circle for this particular lens? It's uncoated.

See http://www.cameraeccentric.com/html/...lensak_15.html . Claims 100 degrees.

Thanks. Sorry for my ignorance, but 100degree of a 6 1/4 inch is ehhhh, how big in mm?

379mm (aproximately)

Can you teach me how to calculate?

PM me your email address, i have a spreadsheet someone was kind enough to post either here or on APUG.

Image circle radius is the base of a right-triangle with a height equal to the focal length and so the tangent of half the angle of view is equal to one-half the image circle divided by the focal length.

I have one, but it does not cover 8x10 well at all. Even closed down all the way the corners on 8x10 are soft and dark. Might just be my lens because others seem to not generate the same complaints. I am going to use it on my 5x7 where I think it will shine.

Vaughn

I have the f9.5 version. Are there any significant differences between the two?

My f/12.5 covers 8x10 just fine stopped down.