5 x 7" negative coverage

[Ole]

Ole, what is the diagonal of an exposed 5 x 7" negative, 205 or 210 mm?

205mm, according to Schneider. I use "about 210mm" since I use both 5x7" and 13x18cm film, frequently on the same day. 210-ish is close enough - see my prevoious post(s).

[Ole]

http://www.bruraholo.no/Cameras/Angulon/

There. That's my "Angulon shootout".

Remember that these shots were done partly to illustrate the difference between the three parameters: Image Circle, Illumination circle, and illumination falloff. So they show a lens which is said to barely cover 4x5" straight on with no movements at small apertures, used on a much larger film size.

Notice that the illumination falls off from the center out (the images get darker), yet there is some image all the way into the corners. But the sharp image ends a little bit in from the corners, showing that the circle of illumination is much larger than the image circle in this case.

A center filter will even out the illumination, giving more even exposure across the field. But the circle of illumination may actually get smaller, since the filter might vignette a little bit of the extremem ends of the circle of illumination. The image circle will be little if at all affected.

[pkbench]

Ole, how might I see thoise images? Thanks CL

[Ole]

Click the link, and click the thumbnails on the new page. Each image opens in a new window.

[pkbench]

Sorry, I just noticed the link.