Image size for stacking.

[+RonC]

Last night I took 40+ images with the Canon 1100d, there size (according to DSS) was 4290 x 2856.

Just took some Flats with the same camera and there size (according to DSS) is 3906 x 2602.

DSS won't stack them because of the different sizes. What is the reason for the difference in image size and

What can I do about it?

 

Cheers

Ron

Edited August 7, 2019 by Ron Clarke
added text

[Bottletopburly]

May be a DSS error Ron , report it on the DSS forum to David partridge https://groups.io/topics

he also on on sgl as @perdrix 

Edited August 7, 2019 by Bottletopburly

[+Graham]

Did you still have the nifty 50 on the front.

Did you take the flats by increasing the shutter speed or decreasing the aperture on the lens.

If you decreased the aperture the image size will get slightly smaller.

 

[+Derbyshire Dave]

On 07/08/2019 at 20:02, Graham said:

Did you still have the nifty 50 on the front.

Did you take the flats by increasing the shutter speed or decreasing the aperture on the lens.

If you decreased the aperture the image size will get slightly smaller.

 

Didn't know about the image size changing slightly with aperture..interesting..

[+Graham]

Make logical sense.

If you reduce the aperture you decrease the diameter of light passing through the lens.

It therefore must affect the size of the image projected onto the chip.

[+RonC]

APT did the calculations, I will check next time and see what it does!!