On Sat I started getting an error when using my Sigma 24-70mm, other lenses work fine. It seems to have a problem focussing and then gives an error about communication with the lens.
I've tried cleaning the contacts by gently wiping them with alcoholic wipes from Maplins but this has not...
Thank you.
What I meant by the second question was if I went from 1600 f/2.8 to 100 f/20 would I then have to compensate by more than 8 stops....i..e whatever the total number of stops was? Or is there a golden rule/limit? (Hopefully I haven't confused you more!)
I did a roughly calculated 5 min exposure yesterday of a tree outside my bedroom window, which I was happy with, but now I have two more questions:
1) Does the time double per stop? i.e. after 240 it is 480?
2) Does the iso and fstop need to be changed the same number of stops? Chaning the...
Thanks eeverson....couple of questions:
1) why the widest and not the smallest if details is what we are after?
2) Was ISO200 the lowest you could go to for that shot - was it not possible to adjust to ISO100?
Many thanks!
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