Hyperfocal methods shouldn't enter the equation at all. Trying to use
hyperfocal methods and failing will almost certainly put infinity out of
focus. Hyperfocal is for including much of the nearby foreground along
with focus all the way to infinity. Since it's only the moon you're
interested in forget the foreground and concentrate on getting infinity
correct.
Setting up for daylight infinity focus and marking the focus point
should work but if you're using a very long lens and small aperture you
need to be focusing on a target about 3 km away. Haze could be a
problem. If you put a piece of tape between the focusing ring and lens
barrel to mark infinity you could slice through the tape (carefully) and
leave it there. Then just align the two pieces of tape when you need
infinity focus.
AFAIK, there should be no way for manual exposure methods on your camera
to change ISO as well. If ISO is changing then you're doing something
else that you're unaware of.
On 10/16/2014 8:53 AM, bj@xxxxxxxxxxxxxx wrote:
Chuck wrote;
Brian didn't have a problem with exposure. His problem was poor focus
and/or possibly vibration. Practicing on a brighter moon should allow
easier practice on focus and perhaps marking the lens for infinity focus
(he says it runs past infinity). He may need some practice with live
view.
/////////////////////////
Well, yes and no.
It didn't take long for me to realise that I had to compensate for the moon
becoming less visible.
So I was constantly adjusting manual speed and ISO, checking the results as
I went along..
I used the scientific technique known colloquially as "By Guess and by God".!
(Apologies to The Maker).
I also adjusted (increased) the f-stop somewhat in order to use the
hyperfocal distance effect to make up for my supposed inaccurate ( but not
quantified) out-of-focus error. I suspect that the technique did not work.
When I looked at the ISO's actually used, as revealed by FastStone, I had
the suspicion that manual exposure adjustment on the E-3 also changed ISO
without letting me know. I did not spend much time trying to get to the bottom
of that one.
Next time, if there is one, I really will try to set up the lens focus in
daylight
and sticky-tape it in that position.
Brian
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