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Thread: Center Filter & Extra Wide Filter Question

  1. #11

    Re: Center Filter & Extra Wide Filter Question

    JPlomley, Thanks for posting that. I'm surprised to hear that a slim mount would vignette, does it do it at all apertures? Before you sell the 55 you might want to try a B&W Extra wide filter, which is made more like a center filter. The extra wides are basically a step up ring with a larger filter all in one unit. The center filter on your 55 is most likely a 67mm to 86mm, right? An extra wide filter for that would be 86mm to 105mm front threads. You could add a cheap 86 to 105 step up and see if that vignettes, before buying anything expensive. Maybe wrap some electrical tape (cut to the correct height) around the inside of the 105mm part, or something else, to simulate the added height and thickness of a filter mount and do some tests. You might find that a regular filter will work on the step-up ring. But, if a filter 3mm thick is vignetting, a step-up ring might add too much height and thickness where it attaches to the C.F. threads too. Hope you find a solution to that vignetting.

    I just ordered a B&W extra wide filter (6-8 weeks special order) for my 90mm with C.F. I hope it works for 5x7, if it doesn't I'll at least have plenty of room to move when I use it for 4x5. I'll definitely post when I have a chance to test it.

    Here's a link to an extra wide polarizer so you can see one.
    http://www.bhphotovideo.com/c/produc...an_Linear.html

    I'm curious about you using a polarizer on such a wide lens, what kind of subject matter are you using it for? I've been thinking about getting one for my 90 & 65mm, but have read that they are of limited use with wides.

    How do you like the IIIB C.F. on the 55? The IIIB corrects 1.5 stops, but according to the Linos (Rodenstock) website the recommended filter for the 55 corrects 2.5 stops. I just bought a IIIB for my Nikkor 65. From what I understand the IIIB works on the 47xl too, as well as the 80xl, 90/f8, and 110xl. It seems like it's the C.F. to own, since it is compatible with so many lenses.

    Tony

  2. #12

    Re: Center Filter & Extra Wide Filter Question

    Tony, you have discovered the joys of a digital era. Most filters now at B&H are special order, basic things like 81EF's and 81B's that used to be common stock in all sizes are now an outrageous wait. I hear you on the SUR from 86 to 105, but I thought if a polarizer at 3mm thick vignettes, then I need a real thin SUR. I will look into a Heliopan and see what I can find. I have a 105 warm tone polarizer (KR 1.5 from B+W) which would do the trick. The reason I sort of avoided this is that the 55mm is already in a 7mm recessed lensboard on an Arca with a 110mm front standard. Putting a 105mm filter on the 55mm will block my ability to set aperture/shutter speed.

    I will only use the polarizer on the ultra wide to eliminate surface glare off rocks etc when I hike the canyons in Zion this fall.

    The IIIb CF corrects very efficiently the light fall off on the 55 Grandagon. Not perfect, but more than acceptable given the cost differential between the Rodenstock recommended filter ($600 at B&H) and the IIIb (used in LN condition for $200, new about $360). I found opening up 1.3 stops as opposed to 1.5 stops was optimal on the Grandagon. The IIIb is not recommended for the 47XL (I believe it is the IIIc you want), but is for the 58mm and the other lenses you mention. Having said that, I have read from owners of the 47XL that the IIIb does a more than adequate job of evening out illumination.

    Thanks for the tips. Looking forward to your results.

    Jeff

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