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Shutter speed "changes"
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Jul 28, 2023 01:48:38   #
kb6kgx Loc: Simi Valley, CA
 
I was outside the other night trying to photograph the Moon. I would take my shot, and then lower the camera down to check the image on the screen. As I'm lowering the camera, I hear and feel a "kerchunk". Probably something in the lens which, I hope, is normal? I then noticed that the shutter speed had changed from what I had it set at. This happened multiple times, sometimes to a higher speed, sometimes to a lower speed. I definitely did NOT rotate the control wheel.

Camera is a Nikon D7100 and the lens is the Nikon 70-300mm f4.5-5.6G ED-IF (the FX version).

Is this something I should be sending in to Nikon to have them look at or is this a normal thing?

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Jul 28, 2023 02:01:36   #
User ID
 
kb6kgx wrote:
I was outside the other night trying to photograph the Moon. I would take my shot, and then lower the camera down to check the image on the screen. As I'm lowering the camera, I hear and feel a "kerchunk". Probably something in the lens which, I hope, is normal? I then noticed that the shutter speed had changed from what I had it set at. This happened multiple times, sometimes to a higher speed, sometimes to a lower speed. I definitely did NOT rotate the control wheel.

Camera is a Nikon D7100 and the lens is the Nikon 70-300mm f4.5-5.6G ED-IF (the FX version).

Is this something I should be sending in to Nikon to have them look at or is this a normal thing?
I was outside the other night trying to photograph... (show quote)

Sounds like some sort of shutter speed safety override of your setting. You can likely immitate your moonshot working conditions indoors at night and figger it out. Seriously doubting any malfunction.

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Jul 28, 2023 02:26:00   #
kb6kgx Loc: Simi Valley, CA
 
User ID wrote:
Sounds like some sort of shutter speed safety override of your setting. You can likely immitate your moonshot working conditions indoors at night and figger it out. Seriously doubting any malfunction.


Thanks. I might just take it to my local camera shop -- yes, we still have one of those! -- and see what he says about it.

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Jul 28, 2023 04:54:51   #
riderxlx Loc: DFW area Texas
 
kb6kgx wrote:
I was outside the other night trying to photograph the Moon. I would take my shot, and then lower the camera down to check the image on the screen. As I'm lowering the camera, I hear and feel a "kerchunk". Probably something in the lens which, I hope, is normal? I then noticed that the shutter speed had changed from what I had it set at. This happened multiple times, sometimes to a higher speed, sometimes to a lower speed. I definitely did NOT rotate the control wheel.

Camera is a Nikon D7100 and the lens is the Nikon 70-300mm f4.5-5.6G ED-IF (the FX version).

Is this something I should be sending in to Nikon to have them look at or is this a normal thing?
I was outside the other night trying to photograph... (show quote)


What happens when you raise the camera back up to the position that you were shooting the moon it did it switch back or did it change and adjust to the new light setting. Just curious that’s what I would do.
Bruce.

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Jul 28, 2023 07:19:37   #
Real Nikon Lover Loc: Simi Valley, CA
 
That is a weird deal. Do you observe and lens focus breathing in the photos? I had something similar happen on a DSLR a few years ago and as I recall, it was the mirror movement when I was using the "MUP" setting. What you describe definately sounds mechanical.

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Jul 28, 2023 07:52:27   #
Bultaco Loc: Aiken, SC
 
Are you using manuel setting?

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Jul 28, 2023 08:00:47   #
sueyeisert Loc: New Jersey
 
Are you using an auto setting or total manual? If totally manual the shutter speed won’t change.

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Jul 28, 2023 08:02:58   #
Longshadow Loc: Audubon, PA, United States
 
sueyeisert wrote:
Are you using an auto setting or total manual? If totally manual the shutter speed won’t change.

Ahhh, yea.
Gonna be lotsa guesses with so little information...

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Jul 28, 2023 08:33:25   #
mikeroetex Loc: Lafayette, LA
 
kb6kgx wrote:
I was outside the other night trying to photograph the Moon. I would take my shot, and then lower the camera down to check the image on the screen. As I'm lowering the camera, I hear and feel a "kerchunk". Probably something in the lens which, I hope, is normal? I then noticed that the shutter speed had changed from what I had it set at. This happened multiple times, sometimes to a higher speed, sometimes to a lower speed. I definitely did NOT rotate the control wheel.

Camera is a Nikon D7100 and the lens is the Nikon 70-300mm f4.5-5.6G ED-IF (the FX version).

Is this something I should be sending in to Nikon to have them look at or is this a normal thing?
I was outside the other night trying to photograph... (show quote)
. The ker-chunk is probably VR turning off. As for shutter speed, sounds like you are in (P) program mode. Or (A) Aperture mode and SS is changing when you point at a differently lighted scene.

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Jul 28, 2023 08:56:52   #
alberio Loc: Casa Grande AZ
 
Longshadow wrote:
Ahhh, yea.
Gonna be lotsa guesses with so little information...


That's how I get most things done 🙃🙃🙃

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Jul 28, 2023 09:05:19   #
Orphoto Loc: Oregon
 
Yet another guess, bracketing is engaged.

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Jul 28, 2023 09:55:48   #
larryepage Loc: North Texas area
 
kb6kgx wrote:
I was outside the other night trying to photograph the Moon. I would take my shot, and then lower the camera down to check the image on the screen. As I'm lowering the camera, I hear and feel a "kerchunk". Probably something in the lens which, I hope, is normal? I then noticed that the shutter speed had changed from what I had it set at. This happened multiple times, sometimes to a higher speed, sometimes to a lower speed. I definitely did NOT rotate the control wheel.

Camera is a Nikon D7100 and the lens is the Nikon 70-300mm f4.5-5.6G ED-IF (the FX version).

Is this something I should be sending in to Nikon to have them look at or is this a normal thing?
I was outside the other night trying to photograph... (show quote)


What did your captured image look like? What shutter speed did you think you were using?

Nikon offers Long Exposure Noise Reduction on at least some models. I don't know if the D7100 has it. But if it does, and if you have it turned on, the camera will take a second exposure just like your intended one, except without opening the shutter. There's a mirror clunk and everything else, just no open shutter. The idea is that it will identify any "hot pixels" and remove them from the original exposure.

I can't imagine that you would be needing exposures long enough to invoke this for the moon, but give it a check. And I'd suggest turning it off if it's turned on. It's not likely needed.

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Jul 28, 2023 10:48:42   #
kb6kgx Loc: Simi Valley, CA
 
sueyeisert wrote:
Are you using an auto setting or total manual? If totally manual the shutter speed won’t change.


Manual.

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Jul 28, 2023 10:52:56   #
wdross Loc: Castle Rock, Colorado
 
kb6kgx wrote:
I was outside the other night trying to photograph the Moon. I would take my shot, and then lower the camera down to check the image on the screen. As I'm lowering the camera, I hear and feel a "kerchunk". Probably something in the lens which, I hope, is normal? I then noticed that the shutter speed had changed from what I had it set at. This happened multiple times, sometimes to a higher speed, sometimes to a lower speed. I definitely did NOT rotate the control wheel.

Camera is a Nikon D7100 and the lens is the Nikon 70-300mm f4.5-5.6G ED-IF (the FX version).

Is this something I should be sending in to Nikon to have them look at or is this a normal thing?
I was outside the other night trying to photograph... (show quote)


I don't know how your camera is setup, but mine will change the setting when it hits a limit. Being that you are shooting at night, it could have hit a limit (ISO and/or aperture) and "forced" the camera to change shutter speed.

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Jul 28, 2023 11:02:01   #
srt101fan
 
kb6kgx wrote:
Manual.


Full Manual?

Or did you have Auto ISO on?

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