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skywatcher st80


cardconvict
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I used my konus same optics as the st80 or imaging when I started. I can't post examples images at the mo, I'll find some and post them later. The semi app filter works pretty well to reduce the ca.

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I took some test shots of M42 (10x90s) with my old ST80 in Jan to see what field of view I could get with a small refractor and my 1000d. I was quite pleased with the result, although the setup was out in that the focal plane was tilted and the flats were poor. It encouraged me to get a Meade 5000 (I sold the ST80!).

post-16060-133877463652_thumb.jpg

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thanks blue astra that is a big difference in how much the field of view can be compared to the c9.25. is the problem with the flats down to the scope?

No, I didn't have a light box to produce good flats at the time. I use a C8 + FR so this image shows the field of view with this combination, which you can compare with the ST80 image (again, problems with flats). The C8+FR is about 1 deg wide. The Meade with a 0.8FR gives me about 3.3 deg. The C8 focal length is similar to the C9.25

post-16060-133877463678_thumb.jpg

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thanks jgs001 can't wait to see these pics. blue astra i know i have'nt being doing this long but the best way i have found doing flats is pointing the scope up at the sky the next day and putting a white shirt over the dew shield and changing the exposer times until the graph show's the spike in the middle of the histogram on the camera. check out the link and compare my pics the m27 is the one with this technique http://www.flickr.com/photos/37024495@N06/

Edited by cardconvict
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As promised, here's the link to the semi apo filter

Achromat & Semi-Apo filters - Baader Semi APO Filter

and a few pics.. These were shot with the Konus (ST80 clone) with a Semi APO filter and a 1.25" CLS filter, mounted on my NexStar SLT mount.

My First M31 (before I did flats)

m31final.jpg

M27

m27-1.jpg

M45

m45bestsofara.jpg

M52 and Bubble

m52bubble.jpg

M38 (smiley face and some red stuff)

m38adj3.jpg

The thing to think about, it doesn't matter what kit you use, although you will get better results with better quality kit, but what using this sort of kit does is provide a lot of practice and it will allow you to achieve good results.

Edited by jgs001
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I had never thought of using the st80 i started with my 8" reflector. I would def give it a go with your st80 if i were you, it will be easier to learn the ropes with than say the reflector i used.

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  • 1 year later...

I'm thinking of getting an ST80 for some cheap and cheerful imaging so this thread has been helpful in showing what is possible.

Of course SkyWatcher does not make a matched field flattener for the ST80... :-) So I was curious whether I could get the stars more pointlike at the edges using Gimp lenses.

I took the liberty of editing cardconvict's image (I hope that's OK) and applied a lens distortion with Edge set to 29.5 (I can't remember if it was plus or minus 29.5 :smiley:). I think the results look promising. I did not crop away the lost space at the edges so that you can see how distorted the image is.

post-20027-133877644493_thumb.jpeg

Edited by Ags
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