Mark IV and Rokinon Issue

Setting up last night for a MW shot and when I hit the "Q" button I get this Foo thing and I cannot get rid of it to set the aperture. Is the lens dead? All was not lost as my Zeiss 21mm got me the shot.
Rokinon 14mm 2.8 manual lens

IMAGE LINK: https://flic.kr/p/Km4u​yR

The lens is a manual lens, you set the aperture using the aperture ring on the lens, and focus manually as well. There is no electronics to control the aperture remotely with the camera. That F00 is showing you that the lens isn't reporting any aperture value at all to the camera.

Could be you need to change a setting in menu to "allow" exposure without lens.

Yes I know that and the shot was way underexposed for my settings. Never noticed the Foo on the screen on previous outings.

He wasn't restricted from taking a shot or setting the other parameters to control his exposure, it sounds like he expected to set the aperture from the Q screen. There might be a newer version of the 14mm with an AE chip but the most that will do is report the aperture ring setting back to the camera as the lens' maximum aperture so that the camera can help with the other 2 parts of the exposure triangle.

Does your version have the AE chip? If not, then you always had F00, and you have to control the exposure settings yourself to get the perfect exposure, the camera won't really be able to do a great job in determining shutter speeds and/or ISO.

This is what I remember from their 85mm and 135mm lenses anyways. I had to take control of the camera with those lenses, basically in M mode. I know it tries to get the other elements correct, but I never seemed to get a proper exposure, and had to set shutter/ISO to compensate.

Non chip and I figured it out...............oper​ator error caused by old age and damn it was dark out there, LOL

Here is a previous old post, perhaps there are some things there too that might help in the future.
https://photography-on-the.net …/showthread.php​?t=1443868

I really like the Rokinon/Samyang line, but I see they are starting to dabble into the AF space, etc. This means I probably should pick up some manual primes while they are available because in a few years, their newer lenses will cost what Sigma used to cost without the ART designation.

TeamSpeed wrote in post #18659774
Here is a previous old post, perhaps there are some things there too that might help in the future.
https://photography-on-the.net …/showthread.php​?t=1443868

I really like the Rokinon/Samyang line, but I see they are starting to dabble into the AF space, etc. This means I probably should pick up some manual primes while they are available because in a few years, their newer lenses will cost what Sigma used to cost without the ART designation.

Thanks for the help!

F00

TeamSpeed wrote in post #18659770
He wasn't restricted from taking a shot or setting the other parameters to control his exposure, it sounds like he expected to set the aperture from the Q screen. There might be a newer version of the 14mm with an AE chip but the most that will do is report the aperture ring setting back to the camera as the lens' maximum aperture so that the camera can help with the other 2 parts of the exposure triangle.

Maybe due to English not being my first language but I wasn't able to conclude that much from the op.

Edit
On Sony and fuji, in addition to not seeing (obviously) the aperture you need to enable Shutterrelease without lens.

Like I said the Zeiss got the shot.

IMAGE LINK: https://flic.kr/p/28VH​Kfu

The Rokinon lens, and any other fully manual lens, although not reporting an aperture value will still work in both Program and Aperture priority modes, since as far as the camera is concerned ƒ/0.0 is actually a valid aperture setting. The camera just works on the assumption that the lens has a selectable aperture range of ƒ/0.0 to ƒ/0.0. If it has a chip it just works as if that value is the only selectable one. So in P mode it can only select the one aperture setting, and must control the exposure with the shutter speed and potentially the ISO depending on settings. Av is pretty much the same, you can only select the one aperture value, and the camera controls the exposure as normal. Green Box/Creative Auto modes should also work OK like this too.

The only exposure mode that won't work with a manual aperture lens on a Canon DSLR is Tv, since the camera is restricted to a single aperture value. I suppose that if you have a camera with OK AutoISO, but no EC control in Manual with AutoISO, you could use a manual lens and Tv with AutoISO to do the same thing with EC.

I'm really surprised that the majority of DSLRs and other advanced cameras make it so hard to use fully manual non reporting lenses, especially the "mirrorless" ones, where manual aperture rings make no difference to the brightness observed for focus. IIRC Nikon and Pentax pretty much remove access to the camera's light metering functionality with fully manual lenses, let alone auto exposure modes. No need for anything other than mounting the lens, and ensuring you have the required exposure mode set.

Alan

BigAl007 wrote in post #18660321
The Rokinon lens, and any other fully manual lens, although not reporting an aperture value will still work in both Program and Aperture priority modes, since as far as the camera is concerned ƒ/0.0 is actually a valid aperture setting. The camera just works on the assumption that the lens has a selectable aperture range of ƒ/0.0 to ƒ/0.0. If it has a chip it just works as if that value is the only selectable one. So in P mode it can only select the one aperture setting, and must control the exposure with the shutter speed and potentially the ISO depending on settings. Av is pretty much the same, you can only select the one aperture value, and the camera controls the exposure as normal. Green Box/Creative Auto modes should also work OK like this too.

The only exposure mode that won't work with a manual aperture lens on a Canon DSLR is Tv, since the camera is restricted to a single aperture value. I suppose that if you have a camera with OK AutoISO, but no EC control in Manual with AutoISO, you could use a manual lens and Tv with AutoISO to do the same thing with EC.

I'm really surprised that the majority of DSLRs and other advanced cameras make it so hard to use fully manual non reporting lenses, especially the "mirrorless" ones, where manual aperture rings make no difference to the brightness observed for focus. IIRC Nikon and Pentax pretty much remove access to the camera's light metering functionality with fully manual lenses, let alone auto exposure modes. No need for anything other than mounting the lens, and ensuring you have the required exposure mode set.

Alan

It's not hard to use a manual lens on Sony and Fuji. You just allow it to release Shutter without lens once and for all and be done with it.

I use manual lenses on my Canon bodies without issue. Manual aperture, manual focus; it hasn't been THAT long since there was no other choice.