Full Manual Lenses, does anyone have experience with Rokinon/Samyang? Exposure Issue

Started 7 months ago | Questions thread
michaeladawson
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Re: Full Manual Lenses, does anyone have experience with Rokinon/Samyang? Exposure Issue
In reply to MRM4350, 7 months ago

MRM4350 wrote:

When a lens is mounted on the camera it will be at maximum aperture (f/2.8). It stops down to the selected aperture when the photo is taken (or the DOF preview is pressed). With a manual lens you can only shoot in 'A' (aperture priority), or 'M' modes, and you must select the aperture using the aperture ring on the lens, the camera cannot select the aperture.

It depends on what you mean by "manual lens".  Most people mean manual focus lenses.  Manual focus lenses can either be chipped or not chipped.  A chipped lens will allow the aperture to be controlled by the camera, you do not have to use the aperture ring.  You can choose whether to use the aperture ring or the camera command dial by a setting in the custom menus.

Most of the new Samyang / Rokinon lenses for Nikon mount coming out these days have a CPU chip in them and can have the aperture controlled by the camera (set aperture ring to f/22) or by the aperture ring.

The exposures indicated by the camera in the two cases seem correct.  That is to say, if the camera said f/2.8 at 1/25s and the exposure came out correct then f/22 at 3s seems like the correct reading.  So the most obvious question then becomes "did the aperture blades close when you pressed the shutter?" This is easy enough to test.  Simply set the lens to f/22 and look into the lens when you press the shutter.  It should be easy to see the aperture blades close.

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Mike Dawson

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