zerogravity
Affiliation
American Association of Variable Star Observers (AAVSO)
Wed, 03/11/2020 - 21:51
So here is a topic for discussion, so my iPhone shoots DNG format(a supposably lossless format), bulb shutter and a changeable ISO.
Would such a thing be useable for “DSLR” Photometry?
I think the way I could experiment with is find my limiting magnitude, then go through the process without publishing the results. Then maybe compare the results(I know we are not supposed to do that) to see how far out it is and if I can consistently get somewhere with it, it might be a interesting thing?
Thoughts and input?
Sure, why not. You might want to try Betelgeuze even without any additional optics.
Cheers
HB
Thats actually the star I wanted to test this on, I guess the question more or less is, even if it is somewhat consistent, would it be quality enough to submit you know
Well, if you make N (say N=5) measurements, reduce them separately, and then take the standard deviation of those values, you should get a good idea about the quality of the data, right (same for a check star)? I see no reason why you should not report a measurement (as filter Tricolor-Green if you use the green channel) if that error is ok. Care has to be taken to avoid saturation, of course.
Betelgeuze is well covered by observers, so that gives a sanity check as well from other observations.
CS
HB
Be aware of vignetting! I've just try DNG on my old IPhone 6s (through third-party app) with blank computer screen: vignetting is quite strong + one big dust spot. You should check this and use at least "flat" correction.
Best regards,
Max