Gel filters are very common in square form, rarely being used in circular form. These are thin flexible sheets of plastic which must be held in rigid frames to prevent them from sagging.
No gel filter slot, either.
Caps top
Samyang 14mm f/2.8 with factory caps. enlarge.
Now we consult a gel filter catalogue or swatch book (as noted above, available from theatrical lighting shops) and see what the closest filter to a +130 mired shift is.
1) Picolite with Fresnel spot attachment and blue gel filter
2) Striplite 60 with a turquoise gel filter on the right side
3) Pulso Spot 4 with 150mm spot attachment
4) Small cardboards to limit the amount of white light falling on ...
The next morning I stuck a 50 CC red gel filter to the rear element of my 17-35 mm zoom, detached my flashes and arms and set off on a 4 m dive.
Rosco The Strobist Collection, Strobist 55 Piece Cinegel Filter Kit with Lumiquest Gel Filter Holder, 1.5" x 3.25" to fit most Shoe Mount Strobes
Canon EF 24mm f/1.4L II USM AutoFocus Wide Angle Lens - USA ...
Nikon groups two SB-R200 remote flashes with a lot of accessories such as little flash stands, diffusers, gel filters, etc. into an R1 Wireless Close-up Speedlight System.
Close-focus distance: Very very close, at just under 1 inch from the lens. The lens is capable of focusing inside the dome port.
Angle of view: 180 degrees diagonal angle of view
Filters: Gel filters accepted at the rear of the lens ...
 See also: Gel, Photograph, Image, Filter, Camera
  
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