Schneider center filters

[Dean Wilmot]

Hi all, with the Schneider centre filters 3, 3a, 3b and is there much difference in effective use on the 65/75/90 and 47mm Schneider lenses they are recommended to be used on since they all seem on paper to be very similar and could just one be bought To service all the lenses noted?

With the 3c which has exposure correction of 2 stops and recommended for 47mm could it also in reality be used to service the 65/75 and 90 lenses as well? Thanks

[Dan Fromm]

Since you're a new arrival here you may not be aware of the forum's resources. One of them is "the list," http://www.largeformatphotography.info/forum/showthread.php?138978-Where-to-look-for-information-on-LF-(mainly)-lenses. It is a set of links to catalogs, articles on lenses and much more. It has a link to my article on center filters. Read the article.

[Drew Wiley]

The 90 and 120 SA's need 1-1/2 stops of correction, so no, it would be different from the 47 CF. Remember, these specs are in reference to the lens being
stopped down, typically to at least f/16 or f/22 working aperture, depending.

[Dan Fromm]

Drew, Schneider made three ranges of w/a lenses -- Angulon, Super Angulon and Superangulon XL -- with different coverages and different recommended center filters. None for the plain A. In addition, 47 mm Super Angulons came with two different filter threads. Guessing is a poor substitute for looking things up, especially since the original post in this discussion was somewhat, um, vague about which lenses it is about.

[Drew Wiley]

I specifically stated, "SA", Dan, not prior Angulon or later XL. I apologize if that was not duly apparent.

[chassis]

I use the Schneider center filter IIIb with the Super Angulon XL 58/5.6 and a Nikkor-SW 75/4.5 and enjoy the result. I give 2 stops more exposure; the Schneider documentation calls for 1.5 stops more exposure.

The 58 SAXL has noticeable, and unacceptable to me, falloff without the center filter. I have not tried the Nikkor-SW 75 without the filter.

A Nikkor-SW 120 with no center filter makes acceptable images for me.

Have a search of this site, there are multiple threads that cover this, such as this one: http://www.largeformatphotography.info/forum/showthread.php?139776-Lens-light-fall-off-test-results

[Drew Wiley]

I have the Nikkor 90/4.5 and use the Schneider 82mm IIIb on it with perfect illumination correction (at the recommended 1-1/2 stop). I don't like the look of even b&w shots without it, although I originally bought this combination for color chromes, where the effect of falloff is even worse. I also used this same filter on a 120 SA for the same reasons.

[Dean Wilmot]

Thanks guys, esp Dan for your invaluable info. Dan to clarify on page 9 of your CF for large format info the super Angulon 8/90mm can be used both with the 3a and 3b center filter is that correct? Whilst the 47mm XL can be used with the 3c and the 3b is that correct too?

[Dan Fromm]

Dean, that's what Schneider says.

[Dean Wilmot]

Great thanks Dan

[Daniel Unkefer]

https://farm2.staticflickr.com/1978/45637947901_26ff92d59a_z.jpg (https://flic.kr/p/2cwSpUH)Small Super Angulon Collection (https://flic.kr/p/2cwSpUH) by Nokton48 (https://www.flickr.com/photos/18134483@N04/), on Flickr

I have two of the older Schneider Center Filters for the chrome Super Angulons. One is marked "Schneider-Kreuznach Center-Filter 8/65" and the other is marked "Schneider-Kreuznach Center-Filter 8/75". Shown with my collection of chrome Super Angulon F8 lenses on Sinar Norma boards.

I'd like to have one for my 47mm F8 Super Angulon. That takes a 40.5mm filter. Has anyone here ever seen one? I buy one if I could find it.

I've thought of using the 65/8 Center filter, with a step-down ring to 40.5mm. Might have to try that.

[Dan Fromm]

Dan, go to the list and read my article on center filters.

Short answers, ain't no 40.5 mm CF. Use the thinnest step ring you can. Test both the 65/8 and 75/8 CFs. If you read the article you'll see -- check product #s -- why I suggest testing the 75.