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It is cropped, yeah, and possibly even interpolated looking closely. Looks like a fine grain filter. The native resolution is my main gripe and the one thing that turns me off buying it. I've seen talk of a version 2 with a bigger sensor, that would get me even more excited.
You can't buy one for love nor money tho', sold out everywhere.
And I'm fully aware stacking won't increase resolution but thanks for clarifying anyway. 😋
While stacking has uses for decreasing noise it will not increase resolution.
That horse head nebula looks like a really tight crop from a wider frame shot.