The Sensei PRO 55-52mm Aluminum Step-Down Ringfrom Sensei PRO 55-52mm Aluminum Step-Down Ringpermits the use of 52mm threaded filters on lenses with 55mm filter threads. It has large side knurls to provide a more textured grip when mounting or removing it from a lens. This step-down ring features a lightweight aluminum alloy construction with a corrosion-resistant, matte black, hard-anodized finish for durability and minimizing reflections.

Use 52mm Filters on 55mm Lens    Knurled Sides for Firmer Grip    Matte Black Finish Minimizes Reflections    Corrosion-Resistant Hard-Anodized Finish

Related Questions and Answers

Q: 1. Any idea as to whether this SDR will fit an Opteka 0.3x fisheye 52mm onto a Canon GL2 with 58mm threads?

A: Yes,it will fit.

Q: 2. What is the difference between this one and SESDR7767 which is the same brand but doesn’t have “pro” in the name?

A: The Pro has knurled edges for a better grip and corrosion resistant aluminum alloy.

Q: 3. Does this filter allows to use a 67mm filter on 52mm lenses?

A: This will actually do the opposite- this allows you to use a 52mm filter on a 67mm lens. Instead, you will want the 52-67mm step up ring: http://bhpho.to/1clCmra

Q: 4. My email was wrong. Is this a 52mm female thread? to a 48mm male thread?

A: The Sensei 52-48mm Step-Down Ring has female 48mm threads on the front of the ring to allow you to connect a filter with 48mm male threads to the step-down ring. The back of the step-down ring has 52mm male filter threads which will screw into the 52mm female filter threads on the front of your lens.

Q: 5. Is the description backwards? This looks like it allows one to use a 72mm filter on a 67mm lens. Why would you use a filter that is smaller than the lens?

A: The description is correct; a step-down ring allows you to use smaller filters on larger-diameter lenses. There are a few reasons as to why, for example, to save on the cost of buying filters again if you already own a lot of them in the smaller size. Also, if the lenses have a very narrow field-of-view, the visible vignette might not be significant and not influence the photo that much.

Q: 6. Can you stack these? I have a 58-77 but I want to convert it to an 82mm. Can I buy a 77mm to 82mm and stack it with the 58mm to 77mm?

A: You can do that, but vignetting is possible on a wide-angle lens--this 58-82mm adapter ring is a better idea: https://www.bhphotovideo.com/c/product/1443406-REG/sensei_surpa_5882_pro_58_82mm_step_up_ring.html

Q: 7. How can I use an 82mm filter on a 77mm lens?

A: A step down ring can be used but will cause vignette issues. We do not suggest doing so.

Q: 8. Does the difference in thread sizes cause noticeable vignetting on wider focal lengths?

A: Very possibly, yes, it depends on the focal length of the lens, how wide it is. It always best to get a larger filter if possible. Putting a smaller filter, especially on a wide angle lens, is a recipe towards vignetting.

Q: 9. hey i have a Tamron 20-40 2.8 77mm Aspherical lens that has a bubble to it, and i want to step down to a 72mm, could this fit on my tamron which is Aspherical? thanks

A: That is a step down ring. If your lens has a 77mm filter thread it will fit and allow you to use 72mm filters on it. Note that stepping down you will get vignette.

Q: 10. Are there any side effects (vignetting, i think is the term used) when using the smaller 77mm filters on the larger 82mm lens?

A: Hi again Steve, just received your reply. I did not consider going to a full frame camera. Throwing that into the mix especially with a 24-70 lens I think pretty much would cause vignetting. Going from an 82mm down to a 77mm equals about one-quarter inch that would equal a one-eighth inch reduction on each side of the filter's rim. I would expect you'll get a lot of vignetting. One consideration is that the Sensei 82-77 step-down ring is not really expensive and if it caused too much vignetting you're not out a lot of money for the ring itself. I buy that brand, as they work very well and at a low cost. I would say to start saving for 82mm filters; I think you'll fine more vignetting than you'll want to deal with, especially going to a full frame camera and that lens.