How To Add An ND filter To The Impossibly Curved Rokinon 8mm F2.8 Fisheye Lens

Jun 1, 2014

Udi Tirosh

Udi Tirosh is an entrepreneur, photography inventor, journalist, educator, and writer based in Israel. With over 25 years of experience in the photo-video industry, Udi has built and sold several photography-related brands. Udi has a double degree in mass media communications and computer science.

How To Add An ND filter To The Impossibly Curved Rokinon 8mm F2.8 Fisheye Lens

Jun 1, 2014

Udi Tirosh

Udi Tirosh is an entrepreneur, photography inventor, journalist, educator, and writer based in Israel. With over 25 years of experience in the photo-video industry, Udi has built and sold several photography-related brands. Udi has a double degree in mass media communications and computer science.

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We mentioned the Rokinon 8mm f2.8 several times on the blog as being a great lens for its price. One thing that is kinda hard to do with this lens is use filters. This is both because the curvature of the lens extends beyond the filter thread and also because of the shape of the petals of the built in lens hood.

This makes it practically impossible to place an ND filter on such lens. The folks at CheesyCam just shared a sweet hack using a Rosco ND gel and some blue tack. The trick is to place the gel at the back of the lens rather than in the front of the lens as we usually do. For ND CheesyCam uses the 3404 gel from the Rosco cinegel sample book, which cuts 3 stops off, and placed it using some blue tack.

Even zoomed in at 400% I was actually quite surprised that the gel almost did not introduce any softness.

[Adding ND Filter Gel on Rokinon Fisheye Lens to Block Light via CheesyCam]

P.S. You can use a similar hack with the Rokinon 8mm f2.8 to shoot infra red photos.

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Udi Tirosh

Udi Tirosh

Udi Tirosh is an entrepreneur, photography inventor, journalist, educator, and writer based in Israel. With over 25 years of experience in the photo-video industry, Udi has built and sold several photography-related brands. Udi has a double degree in mass media communications and computer science.

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4 responses to “How To Add An ND filter To The Impossibly Curved Rokinon 8mm F2.8 Fisheye Lens”

  1. Tim Wong Avatar
    Tim Wong

    Nice to know, looks like it’ll work for my sigma 8-16.

  2. Khwaja Faraz Avatar
    Khwaja Faraz

    and the 14mm 2.8? if it were to be used with a speedbooster on the BMPCC?

  3. AlisonM Avatar
    AlisonM

    I was doing the same thing a couple of weeks ago but used a chopped up bit of floppy disk – lots of softness and long exposures but the results were quite effective.

  4. TJ Avatar
    TJ

    Did the same maybe last year in fact. I just don’t use a tape, but I simply tuck in the edges of the filter in the circular groove around the back element. The problem is though, as you said, avoiding fingerprints. Also, the ability to work quick and fast. If you are using a car in moving from one place to another, it would be better to do the job inside (specially if there is some wind outside) and then move out, otherwise it might be a great mess to work “outside” trying to fit the filter in.