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astrophotography with cheap refractor

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#1 astronoob96

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Posted 07 December 2021 - 02:05 AM

has anyone done astrophotography with a 80/400 refractor such as these:                                               

 

https://www.highpoin...kId=3794273464 

 

https://www.firstlig...vel-80-ota.html

 

https://www.astrosho...400-ota/p,47423

 

if so, i'd be interested to see your results.



#2 james7ca

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Posted 07 December 2021 - 02:39 AM

Here is one example on CN:

 

  https://www.cloudyni...f/#entry7662165

 

Here is another:

 

  https://www.cloudyni...0/#entry7578671

 

And:

 

  https://www.cloudyni.../#entry11404593

 

Just search on CN for ST80 for more.



#3 Hesiod

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Posted 07 December 2021 - 04:28 AM

It may be done but mind that worse the equipment, more skilled you have to to be to get a nice, pleasant picture.

 

I do not have the 80/400 but did a few experiments with a 100/1000 achro and the VMC95: this told me that if have already the telescope it may be worth a try, but if are searching a way to save money this will not be the case: either will outgrow it very quickly or all the extra nuisances you have to deal with will make your journey much more troublesome and steep.



#4 alphatripleplus

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Posted 07 December 2021 - 08:15 AM

I've used a ST80 with a 7nm H-alpha filter to capture emission nebulae. The biggest problem is the very coarse focuser.



#5 John Tucker

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Posted 07 December 2021 - 09:02 AM

There used to be a guy here who shot some nice pictures with an achromatic refractor and a Baader Fringe KIller. I don't remember his name.  You might be able to do nebulae with these also using a dual band filter like the L-Extreme.  Just so you don't have the violet light that causes the halos.

 

If you go to Astrobin and do an advanced search for ST80 as imaging scope, you'll find a lot of hits. The first pages are all some buy doing solar photography, but the DSOs show up around page 22.  Some aren't bad.

 

I noticed one picture of the Pleides using an Orion Skyglow filter.  Pleides is a real tough one with respect to fringing, but they did pretty well using an Orion Skyglow filter, which also cuts the violet and costs half as much as the Baader filter

 

I"ve thought about buying an ST80 and doing this myself. Main reason I haven't is because of the 1.25" focuser.

 

https://www.astrobin...1-12-07&page=22


Edited by John Tucker, 07 December 2021 - 09:08 AM.


#6 astronoob96

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Posted 07 December 2021 - 10:11 AM

alphatripleplus how was the field curvature? that is the biggest thing i'm worried about



#7 rcg1

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Posted 07 December 2021 - 04:10 PM

alphatripleplus how was the field curvature? that is the biggest thing i'm worried about

It's bad. These were taken with an 80/400 (Meade Adventure Scope). The worst is cropped out, but it's still pretty bad.

 

M45
 
 
m33_11-2021


#8 Ibuprofen200mg

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Posted 07 December 2021 - 04:53 PM

Like rcg1 said the field curvature will be pretty severe. I shot a few test shots on my ST-80 before I solid it with an APS-C sensor and would have to crop a good portion of the frame to get round stars. It would be better on a smaller sensor but would still need to be corrected. I have thought about shooting monochrome with one since the fringing would be a non issue as you would refocus for each filter. But then since I'd have to buy another ST-80 ~100$, a 2" focuser ~$130 since I would need a field flatterner...that puts it at $230, which at that price I might as well buy a cheap "ED" doublet like the AT70ED that already has a 2" inch focuser and much better optics/build quality. Fun to think about though. 


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#9 sbharrat

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Posted 09 December 2021 - 09:47 AM

alphatripleplus how was the field curvature? that is the biggest thing i'm worried about

I imaged with an ST120 for a while. What I *DID* have trouble with was the bloated blue stars. Some folks on CN were able to get better results (with my data) but for me it was impossible to really clean up.

https://astro.bharra...34-jan2021.html

https://astro.bharra...42-jan2021.html

 

However, for emission nebula with a dual band filter (I have the L-Enhance), I thought the images were quite good.

https://astro.bharra...49-feb2021.html


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