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Sony Alpha 7 CR does not allow to change aperture and EV

Sheth

By Sheth,
in Sony Alpha Full Frame Cameras

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Sheth Newbie

Sheth

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Hi, I bought sony 7cr and Sigma 24-70f2.8 DG-DN II Art lens and Samyang  35mm F1.8 FE . Both lens when set on M mode, Av and Ev are locked and value does not change while turning assigned dials.  What is the reason for this?

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Cameratose Rising Star

Cameratose

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Both of those lenses have a manual aperture mode.

The Sigma's aperture ring will allow you to change aperture manually with the ring, or when set to 'A', you can use the camera's dials.

The Samyang has a switch that allows you to select focus or aperture with the focus ring. 

Based on your very brief description, it sounds like your lenses are set in aperture.   

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XKAES Experienced

XKAES

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In Manual exposure mode, you select the aperture and shutter speed.  Any auto-exposure feature is turned off, of course.  That should be explained in the user manual.

Depending on your camera, the EV scale in the viewfinder will indicate how far off your settings are from the meter's suggestion.

Also depending on your camera, you can shift the aperture and shutter speed in combination by pressing the AE LOCK button and rotating one of the control dials.

Again, you'll need to review your user manual for details..

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Cameratose Rising Star

Cameratose

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On 8/23/2024 at 6:18 PM, Sheth said:

Both lens when set on M mode, Av and Ev are locked and value does not change while turning assigned dials.  

 

2 hours ago, XKAES said:

In Manual exposure mode, you select the aperture and shutter speed.  Any auto-exposure feature is turned off, of course.  That should be explained in the user manual.

 

He's saying that when in M, the dials don't work.  

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FunWithCameras Community Regular

FunWithCameras

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1 hour ago, Cameratose said:

 

He's saying that when in M, the dials don't work.  

And they are explaining that the aperture dial on the camera won't work if the lens's aperture ring is set to a position other than A - that explains the aperture dial not working.

The other dial mentioned was Ev - if we assume that Ev was meant to be Ec = Exposure Compensation, then we have an explanation for that dial not working. Exposure Compensation does not work in Manual mode because Ec is modifying the values that auto-exposure comes up with, and Manual mode doesn't have auto-exposure.

Fair enough?

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Cameratose Rising Star

Cameratose

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9 hours ago, FunWithCameras said:

And they are explaining that the aperture dial on the camera won't work if the lens's aperture ring is set to a position other than A - that explains the aperture dial not working.

The other dial mentioned was Ev - if we assume that Ev was meant to be Ec = Exposure Compensation, then we have an explanation for that dial not working. Exposure Compensation does not work in Manual mode because Ec is modifying the values that auto-exposure comes up with, and Manual mode doesn't have auto-exposure.

Fair enough?

Well, no, I was explaining that. The other comment said to use the dials, he said the dials aren't working.

I am not assuming anything, no idea what the OP meant by EV not working, could be auto ISO for all we know. 

Fair enough? 

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Cameratose Rising Star

Cameratose

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Where are you guys getting that the camera is operating correctly?

"Both lens when set on M mode, Av and Ev are locked and value does not change while turning assigned dials."

If you can't change the settings with the dials, something is wrong. I shoot in manual 100% of the time and have full control over the camera. If you cannot change the Av (Aperture Value) with the aperture dial, something is wrong. 

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Cameratose Rising Star

Cameratose

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On 8/29/2024 at 6:28 AM, Pieter said:

The aperture ring on the lens needs to be set to A(utomatic), otherwise the Aperture dial on the camera won't work.

Correct for the Sigma, the Samyang has a switch that has to be in the correct position. See my first post.  

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