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Rokinon 14mm F/2.8 Lens Constant Underexposure - HELP!

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TinyT24

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Hi All!

So this is probably the dumbest post, but I simply cannot figure out a way to get my new manual Rokinon 14mm F/2.8 wide angle lens to work. I have a Nikon d610 body and have used manual lenses before but not on this specific body. I added the lens in the Non-CPU lens data (I put it at 15mm focal length since there is not a 14mm option). I put in aperture priority under FControls, and of course have the camera in manual mode.

I cannot find an answer anywhere though as to why I cannot get the exposure to properly adjust. No matter where I point the lens, how I adjust the focal ring and aperture ring, the image is ALWAYS underexposed. The meter will not get even close to the 0 and just remains on the negative side. The lens is focusing though no problem, so I do not think it needs to calibrated or anything.

I am starting to wonder if there is an error with the lens or the body - both are new. If anyone has ANY recommendations for this I would greatly appreciate all the help I could get. I have been waiting weeks to use this lens and it has been two days now of me trying to figure out how to get it to expose properly.

Thanks!
 
TinyT24 said:
Hi All!

So this is probably the dumbest post, but I simply cannot figure out a way to get my new manual Rokinon 14mm F/2.8 wide angle lens to work. I have a Nikon d610 body and have used manual lenses before but not on this specific body. I added the lens in the Non-CPU lens data (I put it at 15mm focal length since there is not a 14mm option). I put in aperture priority under FControls, and of course have the camera in manual mode.

I cannot find an answer anywhere though as to why I cannot get the exposure to properly adjust. No matter where I point the lens, how I adjust the focal ring and aperture ring, the image is ALWAYS underexposed. The meter will not get even close to the 0 and just remains on the negative side. The lens is focusing though no problem, so I do not think it needs to calibrated or anything.

I am starting to wonder if there is an error with the lens or the body - both are new. If anyone has ANY recommendations for this I would greatly appreciate all the help I could get. I have been waiting weeks to use this lens and it has been two days now of me trying to figure out how to get it to expose properly.

Thanks!
Click to expand...
Did you also add the aperture when you added the Non-CPU lens data & is it displaying properly (or does it say something like "F1" or "F0"?)

Make sure that the lens is actually selected in the menu where you set it up. If not, the camera knows this lens exists, but it doesn't know it's attached! :)

Also, make sure that the camera is set up to use the non-cpu aperture ring. It's under the abcdef menu, under f (controls) -> customize command dials -> aperture ring and toggling this to aperture ring. This shouldn't make a difference, but who knows? This basically tells the camera to use the lens' aperture ring to select the aperture, and not the command dial.

Also, what type of metering are you using? Some metering modes can be a bit finicky because they can rely on certain info from the lens (like distance info), and the camera may default to center weighted metering or something. Also, how's your exposure comp looking?
 
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Hi,

Why did you add the lens in non CPU lens data ?

I just bought one (altough I have a Nikon D750 and not the D610). Just set the aperture to 22, hooked it to my camera and worked immediatly.

No need to do anything else.

have you tried it in normal mode (withtout specfying non cpu data) ?
 
ccarrier said:
Hi,

Why did you add the lens in non CPU lens data ?

I just bought one (altough I have a Nikon D750 and not the D610). Just set the aperture to 22, hooked it to my camera and worked immediatly.

No need to do anything else.

have you tried it in normal mode (withtout specfying non cpu data) ?

--
Claude Carrier
Click to expand...
Which lens do you have? It sounds like you actually may have a CPU-lens--especially if you can alter the aperture from your camera's dial (instead of just the aperture ring), which it sounds like you can. Nikon designed CPU lenses with an aperture ring to be able to set to the smallest aperture and be controlled by the camera body. :)

The OP has a lens that has no electronic communication with the camera at all.

You can see a great example on this site . If you have something that looks like that on your lens, it's a CPU lens. :)

Nikkor_CPU07.jpg
 
Last edited:
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ccarrier said:
Hi,

Why did you add the lens in non CPU lens data ?

I just bought one (altough I have a Nikon D750 and not the D610). Just set the aperture to 22, hooked it to my camera and worked immediatly.

No need to do anything else.

have you tried it in normal mode (withtout specfying non cpu data) ?
Click to expand...
 
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