Nikon question, please.a

[ollypenrice]

Folks, we have a guest imaging with a recent Nikon DSLR. The camera, at the moment, seems to outputting stretched data rather than linear data. Is there some way of asking it not to pre-stretch the output? He's done some Milky Way with horizon widefields which show the MW cearly straight from camera. This is alien to a CCD user like me.

Thanks,

Olly

[iksose7]

I'm not sure i understand Olly, how can you tell the image has been stretched?

I am new to the CCD game and the first thing i noticed during first light is that images were completely black (how a stacked DSLR linear image would look) where as when i used my DSLR you could at least see what i had taken a image of.

Are you expecting to see a 'black' image from the DSLR? Or am i misunderstanding.

Callum 

[happy-kat]

On page 2 post by Oddsocks about the Nikon non linear tiff converted file on 30/01/2015.

http://stargazerslounge.com/topic/234995-working-with-star-tools-–-from-nikon-d7100-to-dss-to-star-tools-–-advice/page-2

May not be of help.

[wxsatuser]

Don't know Nikons but Is it taking  jpegs instead of RAW.

[Tinker1947]

Here's a link for a Nikon 5200, Do a Text search for RAW and see what it throws up.....

In my 5200 under the Menu.camera icon there are a couple of NR buttons, check there turned off.......

https://support.nikonusa.com/app/answers/detail/a_id/18112/~/users-manual---d5200

[ollypenrice]

Thanks all. I'm sure that the images that are coming out at the moment are non linear but they are RAWs, not JPEGS. I'll have a read through the links.

Most grateful,

Olly

[Dave]

The Nikon raw files are NEF files. If he's using wide angle lenses, then he should be able to see the MW on his images. What sort of exposure are they using?

[Psychobilly]

What software are you opening the raws in?

A lot of the software seem  apply a non-linear stretch by default... but there should be a linear stretch available

[Mr Spock]

Turn off high ISO NR, set picture control to neutral and turn off Active D-lighting.

You can alter all these settings in Capture-NX if they haven't been changed in camera.

[ollypenrice]

Our guest is off exploring in the sunshine but I'll put all this before him when he's back.

I'm very grateful. Thanks.

Olly