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ISS through an 8” SCT

astrophotography
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#1 Dyno05

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Posted 13 August 2020 - 09:11 PM

I shot this image in April with a hand held Celestron 8se and a ZWO Asi120mc camera. I tried my best to keep the ISS in the center of the Telrad, but even so, the FOV is so small with this combo that even in the center it’s not necessarily in the FOV. Thanks for looking.

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#2 Thomas Marshall

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Posted 13 August 2020 - 09:21 PM

A "Hand held C8"! - Not bad!waytogo.gif


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#3 Stargezzer

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Posted 13 August 2020 - 09:21 PM

You did a great job ! 


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#4 bjulihn

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Posted 13 August 2020 - 09:36 PM

Okay Dyno05, a handheld 8se????? We may have to have a CN wide collaboration here on a possible new handle for you.  My vote is for "ROCKSTEADY" or "IRONMAN"! You haven't shown us your Phd2 guiding graph yet, but I don't doubt you are under 1 arcsec RMS!


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#5 Berny

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Posted 13 August 2020 - 09:37 PM

You should be happy with that.


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#6 gfstallin

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Posted 13 August 2020 - 09:43 PM

Wait...what do you mean by "hand-held Celestron 8se?" I'm picturing you cradling it in your arms while tracking the ISS. That is an excellent image. You should do some hand-held deep sky photography with those skills.

 

It makes for a great astronomy riddle: Which mount probably weighs more than 140 lbs, is adjustable in height from 3 to 6 feet, has only two tripod legs, can handle much larger telescopes if it goes to the gym, requires no power cord, but tracks beautifully? grin.gif

 

George


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#7 troyt

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Posted 14 August 2020 - 04:15 AM

Good one


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#8 Dyno05

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Posted 14 August 2020 - 06:51 AM

Ok, I will try to cover as many points as possible. I was holding the dovetail in my left hand which is at 9 0 o’clock position on the OTA, and my right hand is under the front of the OTA. My Telrad is straight up and down like that. I’m basically using the scope like a rifle that’s not on my shoulder and trying my best to keep getting the ISS in the center. I’m definitely not THAT STEADY, the key is using a very fast exposure to eliminate, or at least minimize the shaking. My last time out I shot 5000 frames in 2.5 minutes and had only 297 frames with the ISS. The FOV is very small so hitting center you can still be missing. However you only really need 1 nice frame so odds are in your favor that you will hit it at least one frame. It’s basically “lucky imaging” with a little bit of thought behind it. The hardest thing is getting the exposure right and hoping the focus holds. My 9.25” went out of focus last time I tried using that. That was not hand held, it was in the mount but I’m quite certain I can hand hold it if I wanted. The problems I run into using a mount with the clutches released is that as the ISS rises you have to contort and crawl on the ground to see through a finder, the tripod legs get in the way and moving two axis’s simultaneously is sometimes problematic so I took matters into my own hand. Pun intended.... lol 


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#9 Asbytec

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Posted 14 August 2020 - 07:05 AM

Really amazing shot.
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#10 anismo

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Posted 14 August 2020 - 09:54 AM

Very nice!!  This has been one of my white whale . Every one of my attempt has failed for one reason or another. 


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#11 Dyno05

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Posted 14 August 2020 - 10:34 AM

Very nice!!  This has been one of my white whale . Every one of my attempt has failed for one reason or another. 

Don't give up. My best advice is use something around 2000mm and only attempt the shot when the ISS is 60° or higher.  If trying stills, at F10 try 1/2000th at iso1600. That will give you the biggest FOV but it’s a 2 person job. Somebody needs to fire burst shots while aim. Video is the easiest but for best clarity you need a 1:1 pixel scale. Meaning 1080 video on dslr isn’t adequate. You can record live view or use an asi camera. The larger the sensor the better.


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#12 anismo

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Posted 14 August 2020 - 01:19 PM

Don't give up. My best advice is use something around 2000mm and only attempt the shot when the ISS is 60° or higher.  If trying stills, at F10 try 1/2000th at iso1600. That will give you the biggest FOV but it’s a 2 person job. Somebody needs to fire burst shots while aim. Video is the easiest but for best clarity you need a 1:1 pixel scale. Meaning 1080 video on dslr isn’t adequate. You can record live view or use an asi camera. The larger the sensor the better.

Thanks for the tip. I have done about 4 times with my C14 and each time it was about 70 degrees (twice it was close to 90 deg!)  Twice my exposure was wrong (4 ms and it was not sharp). Once it was too early and I couldnt check focus . In my  last attempt, I thought I had everything setup (real good focus on Jupiter, good alignment with finder scope etc), exposure was 0.5ms with the ASI174. But I didnt get a single frame in view. I must have bumped my eye against the finder scope and messed up the alignment.. :D 

 

Seeing your  image is definitely encouraging. I will keep trying :)


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#13 Dyno05

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Posted 14 August 2020 - 01:43 PM

Thanks for the tip. I have done about 4 times with my C14 and each time it was about 70 degrees (twice it was close to 90 deg!)  Twice my exposure was wrong (4 ms and it was not sharp). Once it was too early and I couldnt check focus . In my  last attempt, I thought I had everything setup (real good focus on Jupiter, good alignment with finder scope etc), exposure was 0.5ms with the ASI174. But I didnt get a single frame in view. I must have bumped my eye against the finder scope and messed up the alignment.. laugh.gif

 

Seeing your  image is definitely encouraging. I will keep trying smile.gif

With a 14” it should be awesome. The shot above was .74 ms. I don’t know the sensor size of the 174mc but I know it’s no smaller than the 120. However the 14 has a longer focal length too. My last time out I used a different camera with a larger sensor. I used my Canon T3i in 3x video mode. That used a true 1:1 pixel scale by cropping the sensor smaller, but it’s still larger than the 120mc sensor. The ISS was crazy low so the images weren’t great at all. I only tried because it was only an hour after the Crew Dragon left and I wanted to catch both.


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#14 CHEWCH97

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Posted 14 August 2020 - 07:05 PM

Very Nice!!!


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#15 Asbytec

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Posted 14 August 2020 - 07:58 PM

Especially with a hand held Celestron 8se... :)

Edited by Asbytec, 14 August 2020 - 07:59 PM.

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#16 MHD

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Posted 14 August 2020 - 10:10 PM

I can’t even conceive how to take that shot! Wow! 


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