calibration images in landscape or portrait

[alcol620]

Can anyone tell me why some darks and bias frames are seem to be taken in landscape and others in portrait? (Or this is how they show up when I display the image on my laptop screen).

[wxsatuser]

Sounds like the camera has sensed that it was'nt level for some shots.

The rotation is written to the exif data of the file.

You can set the auto rotate to off.

In the yellow menus there is the auto rotate option.

There are three settings.

Auto rotate for camera and computer

Auto rotate for just computer

And off

Hope that helps.

[alcol620]

Thanks wxsatuser

I didn't realise that the camera could sense such a thing. When taking darks, with the camera only (canon 550d) I haven't paid much attention to the position of the camera! Are you saying that the camera can sense this and I should make sure that the camera is always, say sitting on the base? Or have I misinterpreted your comments?

The setting you mention, are these in the camera?

Thanks

[wxsatuser]

Yes!

I believe the cameras know if they are level or not.

I just tried my 60Da and a slight tilt off level gives a portrait view.

Have also noticed this happens when taking lights if the camera is tilted from level on the mount.

Think if you turn off auto rotate all the images will stay landscape, you may have to experiment to see.

[alcol620]

Thanks wxsatuser

I will do that. I have just downloaded the trial copy of Pixinsight and keep getting the error message "Incompatible image geometry" and wondered if this was caused by some calibration images being rotated. However, I have removed these, so they are all consistent but still get the error message!!

Thanks again for your help.

[wxsatuser]

I saw your other post on the PI error.

Do the masters have exactly the same size as the lights?

[alcol620]

When I open properties they all have the same pixel numbers ie 5202 x 3465

I will now move the question to the other post for continuity. Thanks for your help

Regards

Alec