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FORUMS Photo Sharing & Visual Enjoyment Astronomy & Celestial 
Thread started 08 Jul 2020 (Wednesday) 10:02
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Comet C/2020 F3 Neowise

 
Nogo
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Post edited over 1 year ago by Nogo.
     
Jul 24, 2020 11:03 |  #121

bradman11 wrote in post #19098267 (external link)
Using Canon EOS R. Not the greatest. How do you make the starts sharper?
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Your lack of sharpness is not due to the EOS R. It is due to using a longer lens at a slow speed. Look at the stars, they are all elongated. To get sharper with that length of lens, you either have to use a tracking mount or use a faster shutter speed. If you use a faster shutter speed, you can stack images to get more detail. Looking at the image again, it is possible that you bumped the camera or the shutter causes movement. That can be dealt with using a remote release and or shutter lockup.

That or just be happy with the image. If you don't plan to take a lot of astro type photos, do you want to spend hundreds or thousands of dollars to get a little sharper image?


Philip

  
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Post edited over 1 year ago by bradman11.
     
Jul 24, 2020 11:06 as a reply to  @ Nogo's post |  #122

Thanks for the comment. I'm happy with it for some back yard shooting but will try suggestion in the future.


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Nogo
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Post edited over 1 year ago by Nogo.
     
Jul 24, 2020 11:14 as a reply to  @ bradman11's post |  #123

I edited my comment as you were posting your last one. Looking at your image it is likely that you or the shutter "bumped" your camera as taking the shot. If you bumped it, a remote shutter could help. It it was due to shutter slap, do a little research into that, there are methods to stop that.

Also, there is another trick that astro photographers use. Make the shot a little longer than you plan to use. Then put a flat colored black item in front of the lens. Remove it and cover it up afterwards in such a way that it object works as a "shutter." That will remove all chance of camera movement if you have a rock steady tripod.


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Jul 24, 2020 11:52 |  #124

bradman11 wrote in post #19098267 (external link)
Using Canon EOS R. Not the greatest. How do you make the starts sharper?
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Hosted photo: posted by bradman11 in
./showthread.php?p=190​98267&i=i8966
forum: Astronomy & Celestial

Hi bradman11,
To make stars sharper it is not a camera responsibilities. Your camera is great. To make stars sharper you need to eliminate Earth rotation. It is not in human power and much easier to rotate your camera in opposite direction to stop picture moving in camera's frame. People invented so called a tracker which compensates Earth rotation. Even cheap one does good job. Also, you can shorten up camera exposure time and boost ISO as much as noise not destroying the image. In term of focusing on stars: I use home made Bahtinov mask in front of the lens. It is quite easy to make: http://astrojargon.net​/maskgenerator.aspx (external link)
Good luck on your sky shooting efforts and clear sky.




  
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Jul 24, 2020 12:08 |  #125

Last night Thur 7/23 very clear skies - this was 11:20pm.
I used the 50mm f1.4 prime lens @ ISO1600, 4 sec exposure & stopped down to f1.8 for sharpness.
Bonus: Meteor came across also near the comet :)

Side bar: This Canon f1.4 prime has always given me some chroma issues for night imaging ...
I did adjust in post but still shows purple cast where should be pure white :(


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Jul 24, 2020 12:40 as a reply to  @ Slagrim's post |  #126

Great info. Thanks for the feedback.


Canon 1D X ii, 7D, EOS R, 24-70 2.8, 70-200 2.8, 28-135, 100-400

  
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Jul 24, 2020 18:36 |  #127

I went out last night to the Laguna Mountains, east of San Diego, to shoot the Neowise comet for the last time. I was able to catch some of the Starlink satellite train passing by the comet. Fun catch. :-)

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Jul 24, 2020 18:59 |  #128

Thought I would through mine into the mix. First time using the star adventurer, 10 images stacked in PS.


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Jul 24, 2020 20:55 |  #129

First time shooting Astronomy stuff. Carrizo National Monument in CA. was my location.


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Post edited over 1 year ago by Scrumhalf. (2 edits in all)
     
Jul 24, 2020 22:09 |  #130

bradman11 wrote in post #19098274 (external link)
Thanks for the comment. I'm happy with it for some back yard shooting but will try suggestion in the future.


Use the 400 or the 500 rule.

Exposure time = 400/(FL × C)

where C is the crop factor.

So, if you are shooting at 200 mm on a full frame camera, then you don't want your exposure time to be more than 2 sec.

Before you start shooting, place your lens in Manual Focus. Go into Live view and max magnification and manually focus the lens. After you are done, use a strip of scotch tape and tape the focusing ring to the body of the lens so that you don't accidentally bump it in the dark.

Also, use the 10 sec timer to prevent vibrations from your shutter press, etc. Having a cable shutter release or a remote wireless shutter release will help.

Take a bunch of shots and then use software to align and merge the shots.


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Terry ­ McDaniel
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Jul 24, 2020 22:19 |  #131

Probably my last night of shooting the comet. It's getting beyond my equipment now. I put a red line under it in the first photo, and a rectangle around it in the second. These were shot at 18mm, so the comet is very small. And of course the moon is a tad bit overexposed. :)


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Jul 24, 2020 22:22 |  #132

And my last photo at 55mm.


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Jul 25, 2020 05:08 |  #133

Last night I took 75X30sec frames stacked in SharpCap Pro. Sigma 150-600mm lens at 200mm FL and ASI ZWO294MC camera on iEQ45 Pro mount. The picture differs from night before. Look at the comet's nucleus on second picture - crop of the first one. It looks like it have side jet. Is the nucleus falling a part? Do you have something like this or it is overexposed pixels in the cam or it is nucleus trail due to long exposure? Just noted on top of the first picture a galaxy in galaxy cluster above comet's tail.


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Jul 25, 2020 11:51 |  #134

Slagrim wrote in post #19098619 (external link)
Last night I took 75X30sec frames stacked in SharpCap Pro. Sigma 150-600mm lens at 200mm FL and ASI ZWO294MC camera on iEQ45 Pro mount. The picture differs from night before. Look at the comet's nucleus on second picture - crop of the first one. It looks like it have side jet. Is the nucleus falling a part? Do you have something like this or it is overexposed pixels in the cam or it is nucleus trail due to long exposure? Just noted on top of the first picture a galaxy in galaxy cluster above comet's tail.
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I processed one single shot to see if it is a nucleus trail. The nucleus is round and clear. So, in previous picture post it reflects comet movement. Could not think Neowise moves so fast!


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Jul 25, 2020 11:56 |  #135

IMAGE: https://live.staticflickr.com/65535/50138206156_a5aa180f35_h.jpg

Comet NEOWISE during harvest time

Dave
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Comet C/2020 F3 Neowise
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