shannaford
10-Nov-2008, 03:36
Hi all - reaching out for your collective wisdom once again, this time on a B + W 110 3.0 ND filter. My question is not so much about the filter (as I've pretty much decided this is the best option for a 9-10 stop ND that I'm after) but more as to the best size to get.
At present I have a 75mm Rodenstock lens with 58mm front thread and a 150mm rodenstock with 49mm front thread.
So, given concerns about vignetting on the wide angle lens etc should I just buy a 58mm filter and get a step ring for fitting it to the 150mm lens?
I know, I know, this may not fit any future lenses, and I may be looking at a telephoto when finances allow. But here's my cunning plan - is it possible/sensible to mount this filter to the back of a lens if it doesn't fit on the front element? I am currently borrowing a 360mm Tele xenar, and it looks like it would be no prob fitting this filter to the back of the lens with a step ring.
Should I perhaps be buying an even larger filter (72mm? suggestions?) as future insurance and using a step-up ring on the 75mm lens as well?
At first I thought something like the Lee or Hitech system would be the obvious answer, but they don't make ND filters this dark, which means I'd be stacking them, and I don't really want to do that.
I've been doing my head in going over all the possible combinations/possible problems with each and figure I'm not the first person to confront this one - be very grateful for your experiences/thoughts.
With thanks,
Scott.
At present I have a 75mm Rodenstock lens with 58mm front thread and a 150mm rodenstock with 49mm front thread.
So, given concerns about vignetting on the wide angle lens etc should I just buy a 58mm filter and get a step ring for fitting it to the 150mm lens?
I know, I know, this may not fit any future lenses, and I may be looking at a telephoto when finances allow. But here's my cunning plan - is it possible/sensible to mount this filter to the back of a lens if it doesn't fit on the front element? I am currently borrowing a 360mm Tele xenar, and it looks like it would be no prob fitting this filter to the back of the lens with a step ring.
Should I perhaps be buying an even larger filter (72mm? suggestions?) as future insurance and using a step-up ring on the 75mm lens as well?
At first I thought something like the Lee or Hitech system would be the obvious answer, but they don't make ND filters this dark, which means I'd be stacking them, and I don't really want to do that.
I've been doing my head in going over all the possible combinations/possible problems with each and figure I'm not the first person to confront this one - be very grateful for your experiences/thoughts.
With thanks,
Scott.