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By mex
Hi all. first venture into astrophotography all exif, can any star photographers tell me what's in the bottom left hand corner,?, and any tips would be good thank's.
cheers Phil.

Tags: Specialist and abstract Astrophotography

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Jasper87 Plus
9 2.3k 158 England
9 Apr 2019 2:27PM
I'm not an astrophotographer but 30secs is far too long for 70mm unless you want slight movement in the stars! The rule of thumb is to divide the focal length of your lens into 500 and that should be your max exposure to eliminate the movement. A 16-35 f4 lens on my canon worked out at 30secs f4 and iso 6400. ie. 500/16 gave the 30secs, f4 was wide open and the Iso was adjusted to give the best result.

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mrswoolybill Plus
13 1.7k 2099 United Kingdom
9 Apr 2019 6:01PM
I'm not into astrophotography but I take it that you are asking about the strange murky shapes bottom left? Looking closely, this looks like blurred leaves and twigs. I wonder if there was a breeze and it brought some foliage briefly into the frame during the exposure?

dudler Plus
16 986 1537 England
9 Apr 2019 6:36PM
Yes, I'd say that the long exposure has picked up some branches that you may not have seen through the viewfinder.
mex 11 27 3 United Kingdom
10 Apr 2019 11:01AM
Thank, John, Dave, Moira, I didn't see any trees through the viewfinder, will be going Scotland this year so i'll have another look,
thanks again all much appreciated Phil.
paulbroad Plus
12 131 1286 United Kingdom
10 Apr 2019 2:52PM
As above, but the sky should not be brown. That is over exposure, light pollution or both.

Shoot a series of test images varying exposure.

dudler Plus
16 986 1537 England
10 Apr 2019 5:05PM
Paul's comment pushed me to do a mod, altering exposure, contrast and colour balance.

Interestingly, the branches almost disappear, the colour of stars is interesting - and the effect of the long exposure is apparent as every star is a streak, not a point.

Incidentally, beware focus. In the good old days of manual focus lenses, infinity was at the end stop. On most autofocus lenses, you can go past infinity, and blur everything. You therefore need to focus manually in live view to be sure of nailing things.

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