The Movcam 144:90mm Step-Down Ring for Clamp-On MatteBoxes lets you mount 90mm lenses onto 144mm clamp-on matteboxes -- the kinds without a thread on their rear adapter.

The ring is split along a point of its diameter to flexibly widen and mount a mattebox. (A locking pin on the side of the mattebox securely tightens the ring in place.)

Split Ring for Clamp-On MatteBoxes

Related Questions and Answers

Q: 1. Can this lens be used on M-3?

A: Yes. Absolutely. You can use any Leica M-mount lens on your M3 from the 1950's to date including this one. This is one of the best features of the M system. Enjoy!

Q: 2. what is the inside diameter MM or cm,of this collar??

A: This product is designed specifically for the Sony FE 24-240mm f/3.5-6.3 OSS Lens, B&H # SO2424035F. It will have the proper dimensions specifically to fit that lens, which has an outer diameter of 80.5mm.

Q: 3. Is it telescopic like macro elmar 90m f4?

A: The barrel on the Voigtlander 90mm f/2.8 Apo-Skopar (Black) will move in and out as you focus.

Q: 4. The 55mm filter ring inside my lens broke in a fall. It appears to be a small ring that threads into the lens barrel and also serves as a stop to prevent the integrated hood from sliding off. WHERE can I purchase this replacement part?!

A: It would be best to contact Leica directly by calling 1- 800 222 0118.

Q: 5. Is this 6-bit? Thx

A: Yes Leica Macro-Elmar-M 90mm f/4 Lens is 6 bit.

Q: 6. When will this be available for Canon 5D MKIV? Also, can I do macro shots with it?

A: Thank you for your interest in Sigma products. This lens is only available for Sony E and L mount mirrorless cameras. Please look at the Sigma 105mm for Canon https://www.bhphotovideo.com/c/product/806377-REG/Sigma_258101_105mm_f_2_8_EX_DG.html?sts=pi&pim=Y or Sigma 70mm F2.8 for Canon https://www.bhphotovideo.com/c/product/1393480-REG/sigma_70mm_f_2_8_dg_macro.html?sts=pi&pim=Y. Both lenses are compatible with your Canon 5D camera

Q: 7. Where is it made?

A: The Voigtlander 90mm f/2.8 Apo-Skopar (Black) is made in Japan.

Q: 8. I just received this lens but noticed that Lightroom is not applying a profile to it. I'm shooting it with an Leica M10-R. Any suggestions on how I can go about doing this?

A: Here in Adobe website it does not list that lens as supported unfortunately. Another option would be a third party company that would make a lens profile as a plug in that you could add in Lightroom but doing a google search I don't see any. Another option would be to fix any distortions manually in the software. https://helpx.adobe.com/camera-raw/kb/supported-lenses.html

Q: 9. Is this lens compatible with the Leica macro-adapter-m for macro work?

A: The Voigtlander 90mm f/2.8 Apo-Skopar (Black) is compatible with the Leica Macro-Adapter-M.

Q: 10. Can this lens be used on sl2 with an m-l adapter with no issue?

A: Yes, this Leica APO-Summicron-M 90mm f/2 ASPH Lens can be used with a Leica M to L adapter on the SL2 without issues.