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100% Alpha Cellulose Material    Barium Sulphate Coating    Basis Weight: 350 gsm    Thickness: 14.6 mil    Opacity: 100%    Whiteness: 104%    Moderate OBA Content    Acid Free & Calcium Carbonate Buffered    Instant Drying & High Water Resistance    Surface Finish: High Gloss

Related Questions and Answers

Q: 1. Does it come with a lens hood?

A: Yes, the Canon EF 17-40mm f/4L USM Lens comes with the lens hood.

Q: 2. Will this lens work with Canon Rebel EOS XSI?

A: Yes, this lens is compatible with the Canon Rebel XSi.

Q: 3. Does the electronic aperture control work with the BM Pocket 6k?

A: Yes, the electronic apertures can be driven using a BM pocket unit. Just keep in mind that the following BM unit is power hungry.

Q: 4. Is the focus ring on this lens mechanically connected to the inner workings or does the camera have to be turned on with the shutter button partially pressed to adjust focus manually?

A: There is a AF/MF switch on the lens. When it's on AF you have to press shutter half down to Auto Focus. When it's on manual, there's a ring right before the Zoom ring that you rotate to achieve focus.

Q: 5. I have a canon 60d and in the future would like to upgrade to a fullframe camera. Would an Canon Extension Tube EF 25 II benefit me to get the wide angle lens ?

A: The Extension Tube EF 25 II is designed for lenses of 50mm and above, it will not work with this lens which is a 17-40mm. That being said it is a great wide angle lens that you can use on your 60d now and it is also compatible with Full Frame Canon Cameras like the 5D Mark IV and 6D for when you upgrade in the future.

Q: 6. Will this work with Canon RP?

A: Not directly, no. The Canon EF-S 17-85mm f/4-5.6 IS USM Lens is designed for use on Canon DSLR cameras that use the EF-S lens mount. The Canon EOS RP Mirrorless Digital Camera uses the Canon RF lens mount. As such, you would need a lens mount adapter such as the Canon Mount Adapter EF-EOS R, B&H # CAMAEFRF, or the Vello Auto Lens Adapter for Canon EF/EF-S Lens to Canon RF-Mount Camera, B&H # VELAECRCEF, to use the above lens on the EOS RP. Do note that the Canon EF-S 17-85mm f/4-5.6 IS USM Lens is designed for cameras that use the smaller APS-C sensor, while the Canon EOS RP Mirrorless Digital Camera uses a full-frame sensor. As such, you would have to use the [Cropping/Aspect Ratio] under the Shooting Menu in the camera's menu ​set to the 1.6x crop mode to use the lens on your camera. If you use the full-frame setting, you will get a large, dark vignette around the edge of the frame where the lens' smaller imaging circle blocks light from illuminating the pixels on the outer edge of the larger full-frame sensor.

Q: 7. The lens efs 17-85 fits on canon 6D mark II

A: No it will not. EF-S lenses don't fit on Full Frame/EF bodies.

Q: 8. Is this compatible with a 1DC?

A: This lens is not compatible with the Canon EOS 1DC.

Q: 9. is this Canon EF-S 17-55mm zoom compatible with the Blackmagic 6K Pro? all the functions?

A: Yes, the 17-55mm f/2.8 is fully compatible with the Blackmagic 6K Pro.

Q: 10. What lens adapter should I use for a Canon C70 with this lens...? The ef-eos r 0.71x isn't compatible with this lens...

A: To use the Canon EF-S 17-55mm f/2.8 IS USM Lens on the Canon EOS C70 Cinema Camera (RF Mount) you need this adapter, https://bhpho.to/2wL8wZY.