What you want when you focus is more precise _info_, right? :-D
If you're luckier than me you may get to see the sun again before the spot
goes over the limb. :-)
Jostein
-----Opprinnelig melding-----
From: Darren Addy
Sent: Sunday, October 26, 2014 8:20 PM
To: Pentax-Discuss Mail List
Subject: Re: PESO: Sunspot Group 2192 with K-3/Bigma
Thanks for the comments Jack & Jostein.
I tried Live View but couldn't remember how to zoom-in while in Live
View for finer focusing. Need to look it up and then do it more to get
it hammered into my "little grey cells".
:\
On Sun, Oct 26, 2014 at 2:00 PM, Jostein Øksne <[email protected]> wrote:
Darren, have you considered using LiveView and manual focus to do the fine
adjustment?
Interesting to see that Registax does a decent job of deconvoluting
slightly misfocused shots. If you used the 12 sec. self timer, the SR is
automatically turned off, I think. It does turn off with the two second
timer so I believe it would work that way with the longer timer too.
Jostein
Den 26. oktober 2014 18:44:48 CET, skrev Darren Addy
<[email protected]>:
Decided I couldn't let Sunspot Group 2192 (the largest in 24 years)
get away without trying to capture it. I slipped my home made solar
filter over the Bigma's hood and tried some captures with the K-3. I
have yet to apply the AF adjustment to this lens (but sunspots would
be an excellent way to dial it in, I think!) so I attempted it with
manual focus using an Olympus Vari-Magni attached to the viewfinder. I
still don't think I got a single frame perfectly sharp. I think I
forgot to turn off Image Stabilization. Images taken at high shutter
speed and f/9 or so. 12 second self-time was used in an attempt to
reduce vibration.
So I evaluated all the images and picked the 3 that appeared closest
to sharp and converted the DNG to TIF. Then I cropped them to 2000 x
2000 pixel squares and aligned and stacked those 3 images using the
free Registax6.
Here is a screenshot image that shows the improvement made by this
Registax6 processing.
https://www.flickr.com/photos/pixelsmithy/15609849676/
Pixel-peeping has its place in astrophotography post-processing.
:)
This was simply to get the best image to perform post-processing on.
I'm still learning to post-process solar images and so I followed the
recipe given by this guy:
http://www.perseus.gr/Astro-Tips-Solar-Process.htm
Thanks to his reducing the image twice, this results in a smaller
image than I would have liked (only 845 x 845) but I saved copies at
each step and may go back and try to adjust his process to save a
larger version.
Here is the Flickr page of the final result:
https://www.flickr.com/photos/pixelsmithy/15634739362/
Comments and criticism welcome in equal measure.
Darren Addy
Kearney, Nebraska
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