8" is about 200mm so look for lenses with image circle around 200mm. There is a chart here with most info you will need: http://www.largeformatphotography.info/lenseslist.html
8" is about 200mm so look for lenses with image circle around 200mm. There is a chart here with most info you will need: http://www.largeformatphotography.info/lenseslist.html
It's a linear relationship.
The IC diameter at 1:1 (life-size image) is twice that at infinity focus.
It also varies with aperture, getting smaller as the aperture gets larger (smaller f/number).
The IC you find on lens datasheets is usually three stops down from wide open, i.e. f/16 for an f/5.6 lens.
- Leigh
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