Seen one of these lenses in barrel. Focal length of 3 1/4", but the max aperture was only f16. Anyone have any information as to what optical design it follows, a Protar perhaps?
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Seen one of these lenses in barrel. Focal length of 3 1/4", but the max aperture was only f16. Anyone have any information as to what optical design it follows, a Protar perhaps?
Yes, Protar Ser. V.
What sort of coverage in degrees to calculate image circle? Good for 4x5 or not?
Neil, you really ought to treat yourself to a copy of A Lens Collector's Vade Mecum.
The VM says 110 degrees at f/32, ought to cover 4x5. If you're looking at the one on eBay.co.uk, I want it too even though the coverage would be wasted on my little cameras.
A rough guide is that 105 degrees is three times the focal length. So that little 80mm lens should cover 240mm - or 5x7" with a little bit of movements!