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FORUMS Photo Sharing & Visual Enjoyment Astronomy & Celestial 
Thread started 31 Dec 2009 (Thursday) 21:07
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The Official Shoot the Moon Thread

 
Inspeqtor
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Jul 14, 2022 23:16 |  #7456

MalVeauX wrote in post #19404604 (external link)
Hi,

Image scale is the relationship of the focal length and pixel size. Just know that a smaller instrument with a short focal length and a big pixel sensor will have a course image scale, ie, it will be lower resolution, forgiving on seeing conditions, and not ideal for sampling (recording resolution relative to the airy disc). Your 600mm with a 2x TC on big pixels is fine, it will be limited by the 95mm aperture but ultimately limited by the atmospheric seeing for the real resolution potential. Don't worry about it.

Your 90D has 3.19um pixel size, so it will sample visible spectrum (RGB) critically from F12 to F17, so anything in that range will be a good choice. Anything faster (F8, F5.6, F4, etc) will just undersample on your pixel size (lose resolution). Anything slower than F17 will just waste light. Your 600mm at F6.3 with a 2x TC is F12.6 (F13). I would just leave it at F13 (wide open, don't stop down your focal-ratio). If you stop down your focal-ratio in camera, you're closing the iris and masking your 95mm aperture (the actual size of the opening to your lens). So the ideal use of your 150-600 F6.3 is wide open, do not stop down aperture, with a 2x TC for your pixel size.

5ms (milliseconds). I explained it was 1/200s in traditional camera fraction exposure times right after I wrote it.

Your FPS is in video, don't try to do it in still images. You'll just kill your shutter mechanism faster trying to do hundreds or thousands. You don't take still images. You enable video and record video at the fastest FPS it can record at (30 FPS, 60 FPS, 120 FPS, etc). And adjust exposure time to a short value like 1/200s (5ms) so that you freeze motion and seeing as things move.

Gain is your digital ISO. So just turn up your ISO on a typical d/m-SLR.

If you're not familiar with AS!3, there's tutorials on YouTube and lots of resources, its free and highly used. The quality graph displays after you analyze a video of frames and it will weight each frame based on contrast from best to worst and give you a quality graph based on that so you know how many frames are higher contrast relative to the rest so you can choose a more logical amount of frames to align and stack keeping the high contrast ones and not the poor ones. Basically look at the graph after it analyzes it and select how many frames (% or hard value) that have the highest quality weight, such as above 50% or above 75%, etc. It will be few frames. This is why you need many.

Yes, Handbrake is free. It's a video transcoding software. You may need it if your capture file container from your camera is not a typical RAW container (AVI, SER, etc). I know a lot of cameras use MOV and other stuff that may not be read properly by software like AS!3.

You can manually hand track the moon while recording video no problem. Even with an Alt-az mount. It's super easy with a slow motion control manual mount. A tracking mount of course does this for you. But it's not necessary. You can do it with a traditional tripod too, just let the moon drift in the FOV as long as you can. Take video at high FPS while it drifts in your FOV. Do it a few times going for lucky images when seeing moments are good.

Very best,

Thank you Martin! I think I am ok with what you wrote down to "You can manually hand track the moon while recording video no problem."

I believe you are saying to "manually move the "tracking" of the moon while in video mode which will make the video jump quite a bit I believe. The mount I use and love is my Manfrotto 410 Geared Head. I had never heard of an Alt-as mount. I googled it which they seem to be made for Telescopes which I do not own.

I really not am into doing video work, but I am willing to give it a try to get a better more sharp single image. is it possible to change the FPS rate of video?

I would think to make a video of the moon at 1200mm without moving the camera I would only get 2-4 minutes before the moon goes outside the live view of my camera. Should I try using my Geared Head to move the tracking of the moon in my live view?

Thank you very much!


Charles
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MalVeauX
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Jul 15, 2022 06:48 |  #7457

Inspeqtor wrote in post #19404637 (external link)
Thank you Martin! I think I am ok with what you wrote down to "You can manually hand track the moon while recording video no problem."

I believe you are saying to "manually move the "tracking" of the moon while in video mode which will make the video jump quite a bit I believe. The mount I use and love is my Manfrotto 410 Geared Head. I had never heard of an Alt-as mount. I googled it which they seem to be made for Telescopes which I do not own.

I really not am into doing video work, but I am willing to give it a try to get a better more sharp single image. is it possible to change the FPS rate of video?

I would think to make a video of the moon at 1200mm without moving the camera I would only get 2-4 minutes before the moon goes outside the live view of my camera. Should I try using my Geared Head to move the tracking of the moon in my live view?

Thank you very much!

Hi,

Yes you can move the setup and hand track the moon while shooting video. It will jump around. Then stabilize and drift again. Your Manfrotto tripod is an alt-az mount. Your lens is a refractor, no different really from a telescope, just more complicated with focus motors.

On your 90D you just need to look at your options for video. It looks like you can do 120 FPS but at 1080p and you can do 60 FPS for 4k. So try your 4k setting at 60 FPS. Go as long as you can.

2-4 minutes is a lot of time. Go for it. Think about it, at 4 minutes operating at 60 FPS you would have 14,400 frames to work with. And yes, using a tripod that has any sort of smooth or mechanical movement is better than hand tracking.

Very best,


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Inspeqtor
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Jul 15, 2022 07:02 |  #7458

MalVeauX wrote in post #19404730 (external link)
Hi,

Yes you can move the setup and hand track the moon while shooting video. It will jump around. Then stabilize and drift again. Your Manfrotto tripod is an alt-az mount. Your lens is a refractor, no different really from a telescope, just more complicated with focus motors.

On your 90D you just need to look at your options for video. It looks like you can do 120 FPS but at 1080p and you can do 60 FPS for 4k. So try your 4k setting at 60 FPS. Go as long as you can.

2-4 minutes is a lot of time. Go for it. Think about it, at 4 minutes operating at 60 FPS you would have 14,400 frames to work with. And yes, using a tripod that has any sort of smooth or mechanical movement is better than hand tracking.

Very best,

Thank you!


Charles
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Capn ­ Jack
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Jul 15, 2022 18:27 |  #7459

Moon setting Borrego Springs




  
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jgoetz4
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Jul 16, 2022 09:41 |  #7460

Shot this Thursday night at work. Thanks for looking :)
Jim


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Inspeqtor
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Jul 16, 2022 10:39 |  #7461

jgoetz4 wrote in post #19405153 (external link)
Shot this Thursday night at work. Thanks for looking :)
Jim
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Hosted photo: posted by jgoetz4 in
./showthread.php?p=194​05153&i=i129616315
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That looks REALLY good Jim!!


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Post edited 27 days ago by jgoetz4.
     
Jul 16, 2022 11:23 |  #7462

Inspeqtor wrote in post #19405172 (external link)
That looks REALLY good Jim!!

Thanks Charles. Where I'm working in Baltimore, there are usually Hawks and Falcons sitting on top of the light poles. None Thursday night, but the sky was exceptionally clear, so I took advantage of it :)
Jim


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Jul 19, 2022 21:20 |  #7463

Early morning hand held shot.

P.


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mikeeagle
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Jul 20, 2022 05:43 |  #7464

Pagman wrote in post #19406609 (external link)
Early morning hand held shot.

P.
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great shot of the moon!!


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Jul 20, 2022 10:37 |  #7465

mikeeagle wrote in post #19406693 (external link)
great shot of the moon!!


Thank you kindly my friend.

P.


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Aug 01, 2022 22:22 as a reply to  @ Pagman's post |  #7466

Shot early yesterday evening

IMAGE: https://live.staticflickr.com/65535/52257497423_9cddf23d65_b.jpg
IMAGE LINK: https://flic.kr/p/2nBP​kmT  (external link) moon (external link) by Marc (external link), on Flickr



  
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Aug 01, 2022 23:03 as a reply to  @ Raikyn's post |  #7467

Lurking at this thread reminds me so much about this month's moon phase. I'm glad I came here.


Maybe the world can still look beautiful tomorrow...
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Aug 03, 2022 23:23 |  #7468

IMAGE: https://photos.smugmug.com/Misc/Lens/Canon-400L-IS-III/i-89St6Zf/0/33003ffc/X2/20220803-Canon%20EOS%20R5-CR5_0821-X2.jpg

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Aug 04, 2022 12:41 |  #7469

Another picture taken at work last night, using the RP & 24-240, looking WB on Rt 40 @ I-695. Thanks for looking :)
Jim


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Aug 05, 2022 13:26 |  #7470

Just messing around in post with this one.

P.


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The Official Shoot the Moon Thread
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