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FORUMS Photography Talk by Genre Astronomy & Celestial Talk
Thread started 14 Feb 2018 (Wednesday) 03:01
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Focusing!

 
Jocce
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Joined Jun 2012
Solna, Stockholm, Sweden
Feb 14, 2018 03:01 |  #1

So, I'm new to the Astoscape Photography.

One of the hard things is to get the focus correctly.

Right now I am using live-view and 10x magnification and trying to get the focus correct.
But this is REALLY hard when it is pitch black outside and just looking at a small single star in the live view.


So, any more tips about this?


(Using a Mark IV and Samyang 14mm/2,8)


/Jocce



Feel free to correct my English. I'm from Sweden ;)

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DesolateMirror
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Joined Oct 2015
Feb 14, 2018 05:47 |  #2

Some people focus the lens during the day and mark it with tape or just tape it in position but changes in temperature can throw that out a bit. Some focus on a bright object in the distance.

Considering the hyperfocul distance for your setup should be about 7.62 ft, focusing anywhere past that (but not past infinity, which these lenses can do) should get the stars in focus, but the lenses aren't always made with the best quality control and the focus ring can be a bit off with the measurements.

This blog recommends 10ft: http://intothenightpho​to.blogspot.com.au ...ng-rokinon-14mm-lens.html (external link)

I've never been too fussed with foreground elements being in focus so I use the liveview with the lcd brightness turned up and zoomed in all the way, you really have to point it at a big bright star or bright cluster otherwise it can be a bit painful.




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Left ­ Handed ­ Brisket
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Joined Jun 2011
The Uwharrie Mts, NC
Post has been last edited 4 days ago by Left Handed Brisket. 2 edits done in total.
Feb 14, 2018 06:15 |  #3

When trying to focus on stars, rather than slowly trying to dial it in to perfect focus, I usually like to rock back and forth between front focus and back focus. This lets me get a feel for not just where my hand will land, but what sharp focus will look like on the screen.

As said, DOF with a wide lens will be enough that I wouldn't worry about it too much. I usually don't use hyperfocal distance though unless there are foreground elements within 20 feet or so from the lens. When the main subject is the stars, it is best to push focus as close to them as possible.


PSA: The above post may contain sarcasm, reply at your own risk | Formerly he's gone before apostrophe-gate | Not in gear database: Canon 70-210 3.5-4.5, Auto Sears 50mm 2.0 / 3x CL-360, Nikon SB-28, SunPak auto 322 D, Minolta 20

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gjl711
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Deep in the heart of Texas
Feb 14, 2018 07:10 |  #4

Run tethered to a laptop running EOS Utility. It's much easier to see.


Not sure why, but call me JJ.
I used to hate math but then I realised decimals have a point.
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Jocce
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Joined Jun 2012
Solna, Stockholm, Sweden
Feb 14, 2018 07:50 |  #5

gjl711 wrote in post #18563477 (external link)
Run tethered to a laptop running EOS Utility. It's much easier to see.

But a lot more work to bring out in to the woods...


/Jocce



Feel free to correct my English. I'm from Sweden ;)

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