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Singh-Ray 77mm Vari-N-Duo Polarizing Variable Neutral Density Filter (Thin Ring)

BH #SIVNDPT77 • MFR #RT-90
Singh-Ray
Singh-Ray 77mm Vari-N-Duo Polarizing Variable Neutral Density Filter (Thin Ring)
Key Features
  • Neutral Density with Warming
  • Adjust Density From 2-2/3 - 8 f/ Stops
  • Thinner Mount
  • Made With Glass
The Singh-Ray 77mm Vari-N-Duo Polarizing Variable Neutral Density Filter gives you the incredible benefits of two filters in one. With this unique glass filter, you can not only slow down the action but add in the effects of a warming polarizer.
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Singh-Ray RT-90 Overview

The Singh-Ray 77mm Vari-N-Duo Polarizing Variable Neutral Density Filter gives you the incredible benefits of two filters in one. With this unique glass filter, you can not only slow down the action but add in the effects of a warming polarizer.

Heretofore, when photographers wanted to create this effect, they had to "stack" filters on the lens - a sure ticket to vignetting. Now, this all-in-one system permits you to carry one filter to achieve the desired results. Please note that Singh-Ray thin mount filters do not have a front thread.
Additionally - the design of the Vari-N-Duo Filter may introduce irregularities when used with very wide angle lenses, especially on full-frame cameras. Adjust your focal length and reduce the filter density setting until the irregularities disappear.

Front Min/Max density ring lets you adjust density from 2-2/3 to 8 f/stops - greatly extends exposure times
Polarization is easily controlled by rotating the ring just behind the Min/Max ring
The glass LB Warming Polarizer reduces glare from sky, water, wet rocks, and other reflective surfaces
Filter thread on front ring of Standard mount lets you add either a Mor-Slo 5-stop Solid ND Filter or a Cokin holder for ND Grad Filters

Singh-Ray RT-90 Specs

Filter TypeVariable ND with Circular Polarizer, Warming
Density0.8 (2.6-Stop) to 2.4 (8-Stop)
Circular Size77 mm Filter Thread
Front Accessory Thread / BayonetUnthreaded
CoatingsNone
Physical FeaturesSlim
Filter MaterialGlass
Packaging Info
Package Weight0.255 lb
Box Dimensions (LxWxH)4.9 x 4.6 x 1.15"
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question

Hi, this is probably a stupid question, but i was wondering if the 2 filters that comprise the vari-n-duo can be screwed apart and used separately, or if they can only be used together. Thanks!
Asked by: Anonymous
It is not possible to separate the filters into two filters.
Answered by: Yos O.
Date published: 2018-08-27

question

Has anyone use this with Canon 5D mark 3 and 28-300mm lens, is there vignetting at 28mm?
Asked by: Quoc M.
I ordered this filter and tested on my Canon 5d III and 28-300mm lens, there is a dark vignetting issue clearly visible up until a little past the 50mm mark, so not usable on my equipment. I would say it is made for a crop frame camera.
Answered by: Quoc M.
Date published: 2018-08-27
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