I leave for Germany and Switzerland on Monday, I just received a Samyang 24mm 1.4 I have it on my camera Nikon D7200 here is my problem. On the display on top where it shows F Stop there are two EE flashing, and it will not take a picture, this is a manual lens so I expected an error but wasn't expecting it not to take a picture I have it set to manual mode and I have the camera switched from AF to Manual, what am I doing wrong?
Need help before Monday
- Thread starter OldSoul
- Start date
MartinCornwall
Senior Member
Just checked the same lens on my D7100 and it works fine in Manual mode.
I will try it again.
Martin, you are correct it does work in manual mode, thank you for pointing that out.
Bob Blaylock
Senior Member
On the D3x00 and D5x00 models, any “non-CPU” lens (that is, any lens that does not communicate electronically with the camera) can only be used with the camera in Manual mode.
I believe that the D7x00 models have a mechanical AI linkage, which the D3x00 and D5x00 models do not, which I would assume allows it to work more fully with non-CPU, AI lenses.
Am I correct in inferring that your Samyang lens is completely non-electronic?
according to Rokinon maker of Samyang lenses you set the fstop on the lens to f22 and leave it, to change the fstop after that you use the command dials on the camera so it is comunnicating with the lens somehow not sure if this answers your question but this is how it was explained to me.
salukfan111
Senior Member
It depends what you set up on your mirror. I don't need to minimize arperture and lock it on my camera because I don't want it to work that way.
The lens has to be set at minimum aperture for lenses that have a CPU. There is a mechanical prong on the lens and it will not sit properly if the minimum aperture is not set on the lens. For non CPU lenses there is no such problem.
When you fit the lens it will open the aperture to full extent (say F2.8 if it is a 2.8 lens, F1.4 if it is a 1.4 lens) so that maximum light is available. You cane verify this by looking down the lens from the front, before and after it is attached to the body.
For lenses with CPU, when taking the shot, the aperture is closed mechanically. The body knows how much to move the linkage to get the aperture dialed in.
For non CPU lenses on D3xxx and D5xxx, the body has no idea of the maximum aperture hence it cannot determine how much to move the linkage to get the desired aperture. So the mechanical linkage will just move the linkage as far as it can go. Setting the aperture value in the lens, limits the movement of the linkage to the set aperture on the lens.
OT
This mechanical linkage for setting the aperture harks from the old days, when the cameras were purely mechanical. The mounted lens would be fully open, and stop down ;only when the shutter was fired; to the set value.
When you fit the lens it will open the aperture to full extent (say F2.8 if it is a 2.8 lens, F1.4 if it is a 1.4 lens) so that maximum light is available. You cane verify this by looking down the lens from the front, before and after it is attached to the body.
For lenses with CPU, when taking the shot, the aperture is closed mechanically. The body knows how much to move the linkage to get the aperture dialed in.
For non CPU lenses on D3xxx and D5xxx, the body has no idea of the maximum aperture hence it cannot determine how much to move the linkage to get the desired aperture. So the mechanical linkage will just move the linkage as far as it can go. Setting the aperture value in the lens, limits the movement of the linkage to the set aperture on the lens.
OT
This mechanical linkage for setting the aperture harks from the old days, when the cameras were purely mechanical. The mounted lens would be fully open, and stop down ;only when the shutter was fired; to the set value.
Bob Blaylock
Senior Member
Originally, this linkage wasn't even for setting the aperture. It was just so that the camera could open the aperture all the way, when viewing, and then release it to close down to the aperture set on the lens' aperture ring when taking the picture.
On any non-G lens, when the lens is not mounted on a body, the aperture will be closed to whatever is set on the ring. Pushing this linkage upward will open the aperture, and releasing it will allow it to close down again. The earliest Nikon SLRs only did that much; when viewing, the linkage was pushed all the way up, opening the lens to its widest aperture; and when taking a picture, it was released, allowing the lens to close down to the aperture that was set on the ring.
It was with the AI-S development that this linkage was calibrated and made linear, so that it could be used by the camera body to control the aperture in an accurate manner.
And of course, with the G lenses, which have no aperture ring, this linkage becomes the only way to control the aperture.
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