Astrophotography Focus With a Bahtinov Mask
Posted: Sat 24 Jun 2017, 08:32
A focussing aid for the astrophotpgraphers. Necessary, I suppose, as lenses can focus past infinity.
https://petapixel.com/2017/06/23/improv ... inov-mask/
It reminds me of when I was in Norfolk during the club's recent trip there and the moon was visible in daytime. I noticed that I could see it between some branches of a tree which were 15' - 20' feet away. However much I tried with my Fuji XF 50-140 lens, I could only get either the branches or the moon in focus. Not both at the same time. Even at f/22. Depth of field, it seems, does not extend 250,000 miles.
The shot did not work, so I forgot about all about it until now. Perhaps if I had had a tripod with me and focussed manually, I might have found a point of focus where both were sharp simultaneously. Does anyone have an explanation of why I could not get the shot with a single exposure?
https://petapixel.com/2017/06/23/improv ... inov-mask/
It reminds me of when I was in Norfolk during the club's recent trip there and the moon was visible in daytime. I noticed that I could see it between some branches of a tree which were 15' - 20' feet away. However much I tried with my Fuji XF 50-140 lens, I could only get either the branches or the moon in focus. Not both at the same time. Even at f/22. Depth of field, it seems, does not extend 250,000 miles.
The shot did not work, so I forgot about all about it until now. Perhaps if I had had a tripod with me and focussed manually, I might have found a point of focus where both were sharp simultaneously. Does anyone have an explanation of why I could not get the shot with a single exposure?