Schneider Companon S 50mm 2.8
Can someone tell me the optimum aperture setting for the Schneider Companon S? I did a search,but didn't come up with the answer.
I usually find the mid point works the best. Unless you have a very curled neg that won't lay flat.
Mine is best at f 8, but I have seen others best at f5.6 and one or two at f11. You will need to run your own tests to be sure.
[FONT=Comic Sans MS]Films NOT Dead - Just getting fixed![/FONT]
Welcome to APUG!
I've always found 2 or 3 stops to be optimum for sharpness.
I mostly use 3.
My own 50 2.8 Componon S seems to work best at 5.6 and a 1/2. In other words, half way between 5.6 and 8.
I figured this out by printing a series of prints from the same negative at different stops and magnifications.
The sharpest to the eye, and the best look, came from the above setting.
You should though, do your own tests of your own lens.
Sponsored Ad. (Subscribers to APUG have the option to remove this ad.)
My own test is to put a negative with some normal densities and focus at full aperture using a grain magnifier. Once your grain is correctly in focus, close the lens and watch the grain becoming first sharper and then fuzzier. I use the stop at which the grain is sharper, which is f5.6 on my El-Nikkor 50mm f2.8.
Using film since before it was hip.
"One of the most singular characters of the hyposulphites, is the property their solutions possess of dissolving muriate of silver and retaining it in considerable quantity in permanent solution" — Sir John Frederick William Herschel, "On the Hyposulphurous Acid and its Compounds." The Edinburgh Philosophical Journal
, Vol. 1 (8 Jan. 1819): 8-29. p. 11
My APUG Portfolio
Thanks guys. I'll give it a try. I've been using F11, but will make some comparisons. The results have been acceptable, but I may not be getting the best out of the lens.
I'm sure that I'll have lots of questions as I get back to the darkroom after a long hiatus. It's very calming and I love the sense of anticipation. It's a real cure for the instant world we live in. Maybe it's my age, 59, but I have no interest in jumping through photoshop hoops to make an acceptable B & W print. I use computers throughout the day, but prefer my ipod, a little single malt and much better darkroom equipment than I could have afforded as a young man. One difference, of course, is that I no longer stay up to 3 or 4 in the morning printing.
The two 50 S lenses I've had were best at f/8. They were evaluated using glass carriers in aligned 4x5 enlargers at 16X. Print corner sharpness and acutance were compared. The exposed pieces of paper from the corner of a 16x20 easel were marked on the back with the aperture and lens used, all developed together, and examined without reference to the code on the back. The high magnification was chosen to decrease the carrier to lens distance revealing off-axis aberrations and any coverage problems. On axis and at low magnifications, almost any lens will perform well.
I would say it depends on how flat your negative is in the carrier. If it is a glass carrier, it should be flat, and you should get optimal results stopping down by one or two stops.
Originally Posted by Macwax
If you're not taking your camera...there's no reason to travel. --APUG member bgilwee
A couple more points: First, testing with a grain focuser might or might not produce the same results as testing with actual prints. For one thing, grain focusers don't generally tell you much about edge sharpness. There might also be effects in your visual perception that result from the decreased brightness as you close down the aperture, but those wouldn't be the same as what the paper "sees." Thus, although the grain focuser may produce a useful "quick-and-dirty" test, I wouldn't rely on it if you want to determine the very best aperture to use. (There was another recent thread on this topic, though, and my position isn't the only one, so do a search if you want to find other viewpoints.)
Second, the differences between most of the apertures on a high-quality lens like your Componon are likely to be slim. I don't own a Componon, but tests with my two best lenses (an EL Nikkor f/2.8 and a Vega-11U f/2.8) reveal little in the way of differences in center sharpness except at both of the extreme ends of the aperture range, where it drops off. Edge sharpness tends to increase with smaller apertures until close to the very smallest aperture, and this effect is a bit more pronounced, but still not huge except at the widest aperture. Overall, you'll probably be fine for any but the largest enlargements or most nit-picky criteria at anywhere from f/4 or f/5.6 up to f/11 or possibly even smaller. Of course, if you've got some time to spare there's no reason to not perform the tests to determine what's the absolute best aperture....