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Thread started 31 Aug 2022 (Wednesday) 09:16
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Beginning astrophotography advice

 
hobs1466
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Aug 31, 2022 09:16 |  #1

I have started doing some basic astrophotography with my Canon 90D and a 70-300mm lens. The results have been better than expected, but I already want to move to a longer lens (obviously!). While I already plan to get a 150-600mm lens (and maybe an extender) for general use that will double+ my reach, I'd really like to go beyond that.

While researching Meade versus Celestron SCTs to upgrade/replace the Meade I already own, I came across several people suggesting that an SCT is a bad place to start with imaging since the long focal length makes guiding critical. And since accurate guiding is such a learned skill, it's just a recipe for disappointment.

Now to a certain degree, that is at least not much of a cost issue for me since I already own an SCT and would just need to spend <$100 for the T ring and adapter for my camera. That said, it does have me thinking that instead of spending $2000-$3000 to replace my old SCT at some point, maybe I should put the money towards something more suited to learning the basics of astrophotography. That seems to be some form of refractor or reflector scope.

To that end, I'm wondering what more experienced members would recommend? I'm primarily interested in lunar, planetary and brighter messier targets. Mostly because I figure deeper sky stuff is a much tougher ask in my suburban Philadelphia location and I don't have much opportunity to head to a dark sky site. Which my visual astronomy knowledge suggests points towards a refractor. On the other hand, the reflectors tend to be faster which means less guiding.




  
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dangermoney
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Aug 31, 2022 10:24 |  #2

Do you have a equatorial mount? If not, you probably want to research what it is and why you need one.


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hobs1466
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Post edited over 1 year ago by hobs1466.
     
Aug 31, 2022 11:26 |  #3

dangermoney wrote in post #19421153 (external link)
Do you have a equatorial mount? If not, you probably want to research what it is and why you need one.

Well, yes and no. My Meade SCT has an equatorial mount. I would get a new one with a new scope though. I do not currently have one to use with my SLR on it's own, though several manufacturers make star trackers for use with a standard camera tripod. And I do know what one is and why I need it.

But I am more interested in recommendations for the best kind of scope to get started.




  
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Slagrim
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Aug 31, 2022 15:05 |  #4

hobs1466 wrote in post #19421167 (external link)
Well, yes and no. My Meade SCT has an equatorial mount. I would get a new one with a new scope though. I do not currently have one to use with my SLR on it's own, though several manufacturers make star trackers for use with a standard camera tripod. And I do know what one is and why I need it.

But I am more interested in recommendations for the best kind of scope to get started.

Sounds illogically, but first and more important in astro photography you have to invest in equatorial mount. For optics with short focal length up to 200mm you can use inexpensive tracker on photo tripod. Exposure time up to 60sec is okay. For deep sky objects you will need optics ~1000/2000mm focal length which requires very accurate guiding. It means a mount will cost you few thousand $$. To start astro photography, I built so called "barn door" (on pictures). I had access to machine shop and I made one constantly updating and improving its performance with Arduino electronics. It was fun for me to start astro photography with camera and lenses I already had. With that hand made tracker I took lot of pics of Andromeda galaxy an stacked them with free DeepSkyStacker. With my Canon 70-200mm lens I could experiment with different objects like Orion Nebula (the print of it still is on the wall in my bedroom).
So, my point is: use what you have and get taste of astro photography. After some time it will come to you, what you want to shoot and what kind equipment to buy. Build your arsenal slowly and never forget: astro photography is a black hole - easy to dive in, but never get out.

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hobs1466
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Sep 06, 2022 12:41 |  #5

Slagrim wrote in post #19421211 (external link)
So, my point is: use what you have and get taste of astro photography. After some time it will come to you, what you want to shoot and what kind equipment to buy. Build your arsenal slowly and never forget: astro photography is a black hole - easy to dive in, but never get out.
Hosted photo: posted by Slagrim in
./showthread.php?p=194​21211&i=i95739330
forum: Astronomy & Celestial

Hosted photo: posted by Slagrim in
./showthread.php?p=194​21211&i=i99275540
forum: Astronomy & Celestial

That is basically my plan. As I said, my first definite step is just to get a longer lens for the camera. Probably a Sigma 150-600 Contemporary. Just because of price and I have other uses for it than just astrophotography.

I really just raised the question because of some comments I saw warning away from using an SCT. Though since I already own an SCT, I don't have to invest much to get the adapters to give it a try.

Nice rigs by the way! Were they commercially available? They almost look homemade.




  
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Slagrim
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Sep 06, 2022 21:18 |  #6

hobs1466 wrote in post #19423026 (external link)
That is basically my plan. As I said, my first definite step is just to get a longer lens for the camera. Probably a Sigma 150-600 Contemporary. Just because of price and I have other uses for it than just astrophotography.

I really just raised the question because of some comments I saw warning away from using an SCT. Though since I already own an SCT, I don't have to invest much to get the adapters to give it a try.

Nice rigs by the way! Were they commercially available? They almost look homemade.

Gears, ball bearings, stepping motor and something else - from old broken jet printer. Arduino controller, polar scope for polar alignment - web purchase (not expensive). All other parts are my design and labor. Tripod and gear head I already had for photography. Big challenge was to correctly program controller to make it as accurate as possible. On first photo you can see a magnet (like a little coin on the gear, through which threaded rod goes) and white rectangular magnetic sensor on the left of the gear, which was making pulses and controller was correcting step-motor rotation speed. So, it was kind of double joy to make (quite primitive) tracker and do astro photography. After using it some time, I learned how to do polar alignment and how to process photos.




  
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hobs1466
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Sep 07, 2022 06:15 |  #7

Slagrim wrote in post #19423152 (external link)
Gears, ball bearings, stepping motor and something else - from old broken jet printer. Arduino controller, polar scope for polar alignment - web purchase (not expensive). All other parts are my design and labor. Tripod and gear head I already had for photography. Big challenge was to correctly program controller to make it as accurate as possible. On first photo you can see a magnet (like a little coin on the gear, through which threaded rod goes) and white rectangular magnetic sensor on the left of the gear, which was making pulses and controller was correcting step-motor rotation speed. So, it was kind of double joy to make (quite primitive) tracker and do astro photography. After using it some time, I learned how to do polar alignment and how to process photos.

Awesome! Makes the results so much more satisfying.




  
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Sep 12, 2022 15:24 as a reply to  @ hobs1466's post |  #8

Make a list of 10 astro-photo things you want to do / capture, and as you strive for that you will learn and grow skills and techniques.

I did a while back, here's a thread that captured those: Top 10 in 2010 to shoot (Astronomy, non telescope)
https://photography-on-the.net …php?p=9752647#p​ost9752647

FWIW, I've gravitated to wide angle astro-photography.


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hobs1466
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Sep 13, 2022 08:12 |  #9

mtbdudex wrote in post #19424858 (external link)
Make a list of 10 astro-photo things you want to do / capture, and as you strive for that you will learn and grow skills and techniques.

I did a while back, here's a thread that captured those: Top 10 in 2010 to shoot (Astronomy, non telescope)
https://photography-on-the.net …php?p=9752647#p​ost9752647

FWIW, I've gravitated to wide angle astro-photography.

As I said I am primarily interested in lunar, planetary and brighter messier objects. All targets for which some type of scope would be beneficial or even required. I was just looking for some feedback as to what kind of scope people would recommend.

Not that I'm not interested in deep sky, I just don't live in an area conducive to it. If I did, then a larger aperture reflector would be best for that.

I plan to do some wide field as well, but that doesn't require anything beyond the camera and lenses I already have, though lenses can always be upgraded. ;)




  
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