Seeking lens info

eSPhotos · Jun 22, 2011

How can you tell the image circle size of a lens?
I am in the market for a LF lens for 4x5 view camera that I am planning to build.
Are there web sites for lens specs?

Also, what would be the ideal image circle for the 4x5 with a 15 degree max shift.
Thanks

Dan Fromm · Jun 22, 2011

There are many lists posted on the 'net. Here's one: http://graflex.org/lenses/lens-spec.html And here's a Google query that will find many: http://www.google.com/search?q="lar...fficial&num=100&lr=&ft=i&cr=&safe=images&tbs=

There are many many lenses so all of the lists are incomplete. Many are compilations of manufacturers' claims published in catalogs. These are often, especially for older lenses, exaggerated, sometimes greatly exaggerated.

Shift is measured in linear units (miles, yards, feet, inches, ...), tilt in degrees. Which do you mean?

Whiteymorange · Jun 22, 2011

This might be helpful.

eSPhotos · Jun 22, 2011

Thanks Dan for the sites. A few bookmarked.

Re shift, I was referring to angle of offset. 15 degrees of a 150mm FL is equal to approx 40mm (1.5 inches) up/down.

Based on simple calculation, I need a lens that covers 8" x 4" rectangular coverage or 9" (230mm) image circle.
Does this sound right?

eSPhotos · Jun 22, 2011

Whiteymorange said:
This might be helpful.

Thanks

mjs · Jun 22, 2011

Most of us just check the lens specification tables at www.largeformatphotography.info

On the front page, scroll down.

Mike

Seeking lens info

eSPhotos

Dan Fromm

Whiteymorange

eSPhotos

eSPhotos

mjs

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