EOS

[Waddizzle]

“Communication with the camera should be the same for APS-C and FF lenses, shouldn't it? Otherwise, FF lenses wouldn't work on APS-C cameras, but they all do.”

You can tell when I am typing on the iPhone. LOL.

The RF lens adapter tells the EOS R to use crop mode when an EF-S lens is used. The Rokinon cannot tell the camera to use crop mode.

[sarahbaileywv]

That's not accurate. It works fine on my 80D unless you try to lock up the mirror- then the shutter will not close. But yes, definitely not satisfied with the $1200 rf lens at this point. May need calibrated or something- haven't messed too much with it since I mostly keep a 35 mm on there. :-)

[Waddizzle]

It should work on the 80D because it has a crop sensor. The problem arises when you use it on a full frame body. You see the full image circle.

As far as hitting the mirror goes, that should not be happening with the 80D. The R has no mirror to hit.

[Waddizzle]

“ It works fine on my 80D unless you try to lock up the mirror- then the shutter will not close. “

You need to press the shutter twice. Once to raise the mirror. And a second time when you are ready to hire the shutter.

[sarahbaileywv]

Not hitting the mirror- just saying if I lock up the mirror for astrophotography as I do with all my other lenses to avoid the vibration of it closing- you cannot take a photo - if I do not lock mirror up- it takes pics just fine (on the 80 D). For the EOS R- there is 0 functionality for the rokinon lens.

[sarahbaileywv]

nope- it absolutely will not shutter no matter how many times you press it. If you do not lock up the mirror it works fine. The rokinon is fully manual lens and is the only one that will not enable me to use the lock mirror function for astroshots.

[Waddizzle]

It should fire the shutter on the 2nd shutter press. If it fires the shutter without lockup, but not when do that is a problem.

I use a Rokinon 14mm on 6D using lockup. I also use the shutter timer delay, too. I take photos of the Moon the same way.

[ebiggs1]

nope- it absolutely will not shutter no matter how many times you press it. If you do not lock up the mirror it works fine. The rokinon is fully manual lens and is the only one that will not enable me to use the lock mirror function for astroshots.

Which camera is this? The Roknion has no contacts unless it has AF confirm. It can not talk to the camera.

[Waddizzle]

Canon M Series Mirrorless cameras have menu setting that you must enable to use a fully manual lens. You must enable “fire shutter without a lens.”

I am sure the R would have a similar setting. Check the 80D menus for a similar setting when you use lockup.

[Wandalynn]

I love my R! I also have a 6d/II, which I really like too but the R has a lot of advantages over it IMO. One thing I love about the R is the touch and drag focusing, enabling me to move around the focusing point on the LCD screen while I'm looking through the viewfinder. I love that I can use all of my EF as well as my EF-S lenses on the R. I love the EF-to-R adapter with the control ring--it's definitely worth the extra expense. You can customize the function of the control ring, like you would with an RF lens. I have mine set to EV. I love that I can magnify the image I'm shooting through the viewfinder so I can fine-tune focusing manually. I love the FV mode which allows me to use either auto or manual settings for aperture, shutter speed, ISO or EV. And of course, I love the quality of the photos. I haven't had very good luck with the Multi-function Bar because I kept accidentally engaging it so I disengaged it. If you've been a Canon DSLR user, be prepared to have to learn some new things (like how to use the touch-and-drag) and to decide how you want to set up your camera because the R is the most customizeable camera that Canon has made to date.