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View Full Version : 138mm lens which is sharpest aperture


robc
4-Dec-2006, 08:12
if you have a 138mm lens, which aperture do you consider to be its absolute sharpest ignoring dof.
Bill_1856
4-Dec-2006, 08:16
Do you mean 135mm?
robc
4-Dec-2006, 08:31
close enough, I cant put all focal lengths up.
Walter Calahan
4-Dec-2006, 08:58
What does it matter? Sharpness is only a tool for translating one's vision to paper.

What if you have an f/4.5 lens?
Bill_1856
4-Dec-2006, 10:41
I asked because, frankly, I don't know of ANY 138mm LF lenses.
Jim Galli
4-Dec-2006, 11:02
I asked because, frankly, I don't know of ANY 138mm LF lenses.

Bausch & Lomb made a 139mm Tessar in the '50's. It's sharpest aperture was f7.2 so I couldn't vote.
Dan Fromm
4-Dec-2006, 11:05
138/4.5 Graphic Raptar. But what its for is anyone's guess.
fotographis
4-Dec-2006, 13:31
I have a 135mm Schneider Xenotar which is pretty sharp edge to edge even wide open at f/3.5, it only gets better stopped down. The lens seems to excell at around
f/11 or f/16. This has long been my favorite all around lens for 4x5.