Nikon rear-mount bayonet filter, ND options?

babowc

Is there any option for an ND filter on the rear mount bayonet of something like a 16mm 2.8 fisheye?

I've been googling and came up empty.
It'd sure be great for something like a FE beach shot with a long exposure..
Has anyone heard of such thing?

ziggy53

Here's one solution:

http://www.magic-filters.com/tips/dslr_fit.html

Be aware that a rear-mounted filter can throw off critical focus, but that's usually not a problem for ultra-wide and fisheye lenses.

For the gel material itself, Kodak apparently still produces some optical-grade ND gel sheets:

http://www.bhphotovideo.com/c/product/549036-REG/Kodak_8645541_3_x_3_Neutral.html

http://www.bhphotovideo.com/c/search?Ntt=Optical+Gelatin&N=0&InitialSearch=yes&sts=ma&Top+Nav-Search=

babowc

Yikes, the Kodak is a bit too rich for my blood..
I will be ordering from Lee filters and attempt to rig something on one of my spare filters!
Thanks for the idea, ziggy!

babowc

By the way..
If I stacked two ND 0.9 filters on top of each other, would it effectively make ND 1.8 (6 stops)?

ziggy53

babowc wrote: »

By the way..
If I stacked two ND 0.9 filters on top of each other, would it effectively make ND 1.8 (6 stops)?

Yes, you can stack filters but I believe that you will see more optical degradation stacking rear filters than stacking the larger front filters. I believe that you are correct in your arithmetic and resulting ND value.

babowc

Great!
I will experiment with the 0.9ND (3 stops) and go from there..
since a CP filter consumes 2 stops..

babowc

So I got some ND filter sheets and experimented.

It looks decently promising!
I will post up the results after returning from my trip!