This EOS Lens Adapter for 2" EFW Filter Wheel allows the use of full-frame Canon EOS lenses with the ZWO Electronic Filter Wheel and ASI cooled astronomy cameras. The adapter has an EOS bayonet on the lens side and an M54 x 0.75 thread on the EFW side. It is compatible with all ZWO Pro cooled cameras with APS-C or larger sensors. The adapter is not compatible with EF-S or mirrorless lenses.

Use Full-Frame EOS Lenses with EFW    For Select ZWO Cooled Astronomy Cameras

Related Questions and Answers

Q: 1. Another vendor reports that the safety of the Seestar solar filter is uncertain. Does B&H have any information on this?

A: There are no safety issues involving the ZWO Seestar S50 50mm f/5 All-in-One Smart Telescope, to our knowledge.

Q: 2. Manzell (1/1/2012) said that the Viltrox has the electrons c contacts, but does the autofocus work with this mount adapter?

A: Viltrox EF-EOS M Lens Mount Adapter for Canon EF or EF-S-Mount Lens to Canon EF-M Mount Camera supports auto-focus.

Q: 3. Hi, I was looking for adapter for my canon m50 camera and I saw this adaptor is cheaper than original canon brand, what is difference between canon manufacture and your brand name, does it affect quality of the video or picture if I use non original canon adaptor ? Thanks,

A: This Viltrox EF-EOS M Lens Mount Adapter for Canon EF or EF-S-Mount Lens to Canon EF-M-Mount Camera would have the same functionality in mind as the original Canon version. There are no negative effects reported with the use of this adapter.

Q: 4. Would this work on Canon M50 Mark ii with a Sigma 55-200mm lens?

A: Yes, the Viltrox EF-EOS M Lens Mount Adapter for Canon EF or EF-S-Mount Lens to Canon EF-M-Mount Camera will work with the Canon EOS M50 Mark II Mirrorless Camera (B&H # CAEM502B), though using the Sigma Zoom Normal-Telephoto 55-200mm f/4-5.6 DC Autofocus Lens for Canon Digital EOS (B&H # SI5520045CAF) may cause the edges of the image to vignette.

Q: 5. Is this compatible with the Canon R5?

A: At this moment the Canon PL to RF Lens Mount Adapter for EOS C400 we can only say works with the Canon C400 Cinema Camera. An alternate idea for the Canon R5 is listed below. Wooden Camera Pro Lens Mount Adapter for ARRI PL-Mount Lens to Canon RF-Mount Camera BH #WO268600 • MFR #268600 Metabones Lens Mount Adapter for ARRI PL-Mount Lens to Canon RF-Mount Camera BH #MEMBPLEFRBT1

Q: 6. are these wheels compatible with Steadicam Stand from Tiffen?

A: No, the Kupo 8" Pneumatic Wheel with Square Speed Adapter (Set of 3) is not compatible with a Steadicam stand from Tiffen.

Q: 7. Is the tripod mount removable?

A: Yes, this has a detachable tripod foot.

Q: 8. Are the references to time in the App all based on Chinese time?

A: The time is based on your smartphone and location when using the ZWO Seestar S50.

Q: 9. Does the Seestar track comets?

A: The ZWO Seestar S50 50mm f/5 All-in-One Smart Telescope (BH # ZWSSS50 ) can spot a comet, but it cannot track it.

Q: 10. I know I need wi-fi to download app. Do I still need it to operate telescope, "in the field"? IE a no wi-fi location?

A: The ZWO Seestar S50 50mm f/5 All-in-One Smart Telescope does not need Wi-Fi when in use. It can communicate with your smartphone or tablet using Bluetooth.