I noticed that my Lunar images taken with a Barlowed Newtonian telescope and a Canon Rebel DSLR camera at prime focus appear to be correct-image (not up-down reversed). Any explanation for this? I don't think the Barlow lens would flip the image, so maybe the DSLR camera is doing it automatically? What would happen if the camera sensor was rotated by 180 degrees (so that the hotshoe was on the bottom and not on the top of the camera when doing Lunar observing)?
I had the largest dimension of the APS-C sensor oriented to be parallel with the optical axis of the Newtonian telescope. The image appears to be correct but does look to be slightly off-axis compared to Virtual Moon Atlas, so I am guessing that (somehow) the image is being up-down reversed (twice), but there is still a slight rotation from a correct-image (naked-eye) view since the alignment between the camera sensor and the optical axis was not likely perfectly parallel.
I figure maybe the DSLR camera is programmed to automatically flip the image from the sensor, if it is primarily designed to be used with refracting DSLR lenses which may be producing a left-right up-down reversed image? But it doesn't appear to be left-right reversed.
Edited by Nicole Sharp, 12 September 2019 - 11:58 AM.