Iso setting on D7000 - Forums

Topic starter

Feb 28, 2025

Hi, I recently attempted my very first AP with my new Az-eq6. Also first time with equatorial mount and my D7000 connected to a skywatcher ED80. Prior to this, I tested my D7000 with a lens attached, to get back into using it. It was set on manual, bulb and iso 1600. I changed nothing before attaching to scope. However after taking 90 x 60 second images of my chosen first target, Andromeda galaxy, the exif data from D7000 is telling me the images were taken at iso 100! Based on your experience, can anyone tell me what's going on, and is it obvious from looking at the individual NEF file, if it was actually iso 100 or 1600? The exif also says I used a 28 mm lens, and I know that's wrong!

Thanks

Mark

andrea tasselli

Frequent contributor

Feb 28, 2025 · Edited: Feb 28, 2025

Nikons are (nearly) ISO-less so shooting at low ISO doesn't matter that much. If the camera doesn't find a lens to comunicate with I find that sometimes the last setting used somehow goes in although I can't recall this happening with the D7000.I'd expect that at ISO 100 the backgroiund would be pretty dim and the opposite if you were shooting at ISO 1600. BTW, I'd recommend to stick to ISO 200 with the D7000.

Dhiraj Patil

Feb 28, 2025

A couple of thoughts come to my mind:-

1) Try again and see if it records ISO 100 in RAW Image?

2) How does Histogram of the current image look like?

3) Probably share raw image?

Monty Chandler

Feb 28, 2025

For most dslr's I think iso800 is considered unity.

Astroplantfish

Topic starter

Feb 28, 2025

A couple of thoughts come to my mind:-

1) Try again and see if it records ISO 100 in RAW Image?

2) How does Histogram of the current image look like?

3) Probably share raw image?

Thanks. I'll try and send one of the NEF files over later.

Well Written Respectful

Astroplantfish

Topic starter

Feb 28, 2025

A couple of thoughts come to my mind:-

1) Try again and see if it records ISO 100 in RAW Image?

2) How does Histogram of the current image look like?

3) Probably share raw image?

Thanks. I'll try and send one of the NEF files over later.

Hi, I did some more processing tonight. Used Sequator for stacking 90 lights which may or may not have been iso 100. 11 darks, then Affinity Photo 2. I am very inexperienced with processing, but managed to produce this. Would this help to determine original iso of each of the 90 subs?

Dhiraj Patil

Feb 28, 2025

A couple of thoughts come to my mind:-

1) Try again and see if it records ISO 100 in RAW Image?

2) How does Histogram of the current image look like?

3) Probably share raw image?

Thanks. I'll try and send one of the NEF files over later.

Hi, I did some more processing tonight. Used Sequator for stacking 90 lights which may or may not have been iso 100. 11 darks, then Affinity Photo 2. I am very inexperienced with processing, but managed to produce this. Would this help to determine original iso of each of the 90 subs?

Hi

You shared JPG version. Are all 90 subframes in .JPG or you shot RAW format (.NEF) . NIKON D7000 or any Nikon RAW will have extension .NEF. If all original data (90 subframes) in JPG, that might explain.

What is the following MENU item set on your camera. I also highlighted NEF (RAW).

Astroplantfish

Topic starter

Feb 28, 2025 · Edited: Feb 28, 2025

A couple of thoughts come to my mind:-

1) Try again and see if it records ISO 100 in RAW Image?

2) How does Histogram of the current image look like?

3) Probably share raw image?

Thanks. I'll try and send one of the NEF files over later.

Hi, I did some more processing tonight. Used Sequator for stacking 90 lights which may or may not have been iso 100. 11 darks, then Affinity Photo 2. I am very inexperienced with processing, but managed to produce this. Would this help to determine original iso of each of the 90 subs?

Hi

You shared JPG version. Are all 90 subframes in .JPG or you shot RAW format (.NEF) . NIKON D7000 or any Nikon RAW will have extension .NEF. If all original data (90 subframes) in JPG, that might explain.

What is the following MENU item set on your camera. I also highlighted NEF (RAW).

Hi, yes it is a jpeg, but previously was a tif file which was produced from stacking 90 x 60 s FIT files, all generated from NEF files. But, the jpeg looks similar to the tif file, so I just wondered if you could tell from this whether it originated from iso 100 or 1600 NEFs?

Dhiraj Patil

Feb 28, 2025

A couple of thoughts come to my mind:-

1) Try again and see if it records ISO 100 in RAW Image?

2) How does Histogram of the current image look like?

3) Probably share raw image?

Thanks. I'll try and send one of the NEF files over later.

Hi, I did some more processing tonight. Used Sequator for stacking 90 lights which may or may not have been iso 100. 11 darks, then Affinity Photo 2. I am very inexperienced with processing, but managed to produce this. Would this help to determine original iso of each of the 90 subs?

Hi

You shared JPG version. Are all 90 subframes in .JPG or you shot RAW format (.NEF) . NIKON D7000 or any Nikon RAW will have extension .NEF. If all original data (90 subframes) in JPG, that might explain.

What is the following MENU item set on your camera. I also highlighted NEF (RAW).

Hi, yes it is a jpeg, but previously was a tif file which was produced from stacking 90 x 60 s FIT files, all generated from NEF files. But, the jpeg looks similar to the tif file, so I just wondered if you could tell from this whether it originated from iso 100 or 1600 NEFs?

Just by looking at JPG alone, One can not tell what ISO was used. Can you load .NEF in Affinity and read ISO from there? If not can you attach one RAW NEF file (middle of the sequence)?

Concise

Astroplantfish

Topic starter

Mar 1, 2025

A couple of thoughts come to my mind:-

1) Try again and see if it records ISO 100 in RAW Image?

2) How does Histogram of the current image look like?

3) Probably share raw image?

Thanks. I'll try and send one of the NEF files over later.

Hi, I did some more processing tonight. Used Sequator for stacking 90 lights which may or may not have been iso 100. 11 darks, then Affinity Photo 2. I am very inexperienced with processing, but managed to produce this. Would this help to determine original iso of each of the 90 subs?

Hi

You shared JPG version. Are all 90 subframes in .JPG or you shot RAW format (.NEF) . NIKON D7000 or any Nikon RAW will have extension .NEF. If all original data (90 subframes) in JPG, that might explain.

What is the following MENU item set on your camera. I also highlighted NEF (RAW).

Hi, yes it is a jpeg, but previously was a tif file which was produced from stacking 90 x 60 s FIT files, all generated from NEF files. But, the jpeg looks similar to the tif file, so I just wondered if you could tell from this whether it originated from iso 100 or 1600 NEFs?

Just by looking at JPG alone, One can not tell what ISO was used. Can you load .NEF in Affinity and read ISO from there? If not can you attach one RAW NEF file (middle of the sequence)?

Thank you. I tried to send a nef sub, but astrobin seems to prevent me.
Affinity Photo 2 says it's iso 100,but I never set it at that.

Wei-Hao Wang

Mar 1, 2025

Check this out on Photons to Photos. You will see that its read noise goes down from low ISO to high ISO. It stops decreasing from ISO 1006, meaning that using any ISO above 1006 will not benefit you (from the point of view of lower read noise). Although ISO 800 has a read noise that's a tiny bit higher, I would say ISO 800 is the one to use, since this number is easier to remember (and therefore to use consistently every time).

Well Written Helpful