topic Re: rf 600mm f4 in EF & RF Lenses

RF600mm F4 L IS USM Aperture Blades Visible

paprika_pm — Sat, 04 Mar 2023 15:28:36 GMT

Hi there. I just received my new RF 600mm F4 lens from Canon shop and I wonder if the aperture blades should be visible when lens is off camera? Is that normal? I own array of Canon lenses in EF mount including 800mm prime and none of them have aperture blades visible when lens is powered off. Is that a RF mount thing? Please advise me on the subject as this is is my first RF lens.

Re: rf 600mm f4

deebatman316 — Sat, 04 Mar 2023 01:20:51 GMT

Yes ALL RF Mount lenses stop down the aperture to the smallest aperture when the camera is OFF. This is to protect the image sensor. I am not sure if the same thing happens with adapted EF glass.

-Demetrius

Current Gear: EOS 5D Mark IV, EF 16-35mm F/2.8L III USM, EF 24-70mm F/2.8L II USM, EF 50 F/1.8 STM, EF 85mm F/1.8 USM, EF 70-200mm F/2.8L IS III USM, 470EX-AI & 600EX II-RT

Retired Gear: EOS 40D & Sigma 17-50mm F/2.8 EX DC OS HSM

Re: rf 600mm f4

paprika_pm — Sat, 04 Mar 2023 03:09:25 GMT

Thank you. I'm concerned how easy would it be to damage it. Let's say you drive on unpaved road while lens is powered down ( a lot of vibrations happening ) or moving in and out of your vehicle.

Re: rf 600mm f4

deebatman316 — Sat, 04 Mar 2023 03:19:18 GMT

My friend owns owns the RF trinity of lenses (15-35mm F/2.8, 24-70mm F/2.8 and 70-200mm F/2.8) along with the 50mm F/1.2 and the 85mm F/1.2 prime lenses. She's never had a problem with ANY of her lenses breaking due to vibration. In a moving vehicle on bumpy pavement.

-Demetrius

Current Gear: EOS 5D Mark IV, EF 16-35mm F/2.8L III USM, EF 24-70mm F/2.8L II USM, EF 50 F/1.8 STM, EF 85mm F/1.8 USM, EF 70-200mm F/2.8L IS III USM, 470EX-AI & 600EX II-RT

Retired Gear: EOS 40D & Sigma 17-50mm F/2.8 EX DC OS HSM