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Old 10-11-2019, 07:00 PM
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Ant0nio (Tony)
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Any thoughts on these two?

Hi all, I plan to invest in a compact astrograph to gain a wider FOV. At the moment I'm using a William Optics FLT98 with it's dedicated field flattener, the AFR-IV which gives me F5.
It'a a lot of weight hanging off the focuser with my SBIG 8300 attached & whilst I'm relatively pleased with the results I like the idea of a flatfield Petsval refractor design without the complication of spacers etc. & less flexure.
These are the two I'm interested in:

The Sky Rover can be had online for Circa $1200
http://www.sky-rover.com/showproject.asp?ProdNum=183

The Sharpstar will be available in Sydney shortly for $1100 + shipping
http://www.sharpstar-optics.com/inde.../edph/238.html

I'm aware Casstony has the 61EDPH which seems very capable, (feel free to comment Tony ). I must admit I'm drawn towards the Sky Rover though with it's slight aperture advantage.
A flat field & good colour correction are important to me. Any thoughts?. Thank in advance.
Tony
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  #2  
Old 10-11-2019, 07:55 PM
casstony
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The Skyrover f/5 and the Sharpstar 61edph and WO Redcat 51 all seem like decent imaging scopes. Perhaps choose based on focal length? The Redcat gets you more differentiation from your current scope.
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Old 11-11-2019, 02:03 AM
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Ant0nio (Tony)
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Quote:
Originally Posted by casstony View Post
The Skyrover f/5 and the Sharpstar 61edph and WO Redcat 51 all seem like decent imaging scopes. Perhaps choose based on focal length? The Redcat gets you more differentiation from your current scope.
It certainly does Tony, it has the widest FOV by a good margin. It was on the short list with the other two but I was a bit worried oversampling might be an issue with the KAF8300 chip in my cam.
I'm not sure how big of a problem this is but the FLT98@F5 is already pushing the boundary apparently according to the "Nyquist theorum".

The image of M31 I posted recently was done using my Z70 & .8 FR giving it a focal length of 344mm which is almost identical to the Sky Rover specs.
& to be honest I'd be happy enough with that image scale/Fov with a better corrected Fov & colour. The smaller stars were looking a bit 'blocky" in that image even though it was binned @50%.

I guess that's why I'm leaning towards the Sky Rover, it's not too far removed from what I know is doable with my camera but I can't find much in the way of reviews.
I believe it's a newer improved version of the model that was farmed out to Meade & William Optics as the 70mm Quad Astrograph & Star 71 V2 variant.
Your input has been valuable though Tony, I'm sorry for the long winded reply but it was helpful to get this reasoning out of my head & on to paper as such.
I'm going a bit trying to make a decision on this.
Cheers,
Tony
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Old 11-11-2019, 07:39 AM
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It would be an easier decision if you buy another telescope and another camera
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Old 11-11-2019, 10:10 AM
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Quote:
Originally Posted by casstony View Post
It would be an easier decision if you buy another telescope and another camera
I'm with Tony

Sounds like you're looking for other options

When it comes to resolution, it might be worth considering a little more focal length and a larger sensor. Full frame DSLRs/mirrorless cameras are relatively inexpensive today compared to just a few years ago.

That way, you can tune both your FOV and resolution as desired...
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Old 11-11-2019, 09:12 PM
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Quote:
Originally Posted by casstony View Post
It would be an easier decision if you buy another telescope and another camera
Quote:
Originally Posted by Camelopardalis View Post
I'm with Tony

Sounds like you're looking for other options

When it comes to resolution, it might be worth considering a little more focal length and a larger sensor. Full frame DSLRs/mirrorless cameras are relatively inexpensive today compared to just a few years ago.

That way, you can tune both your FOV and resolution as desired...
You're both absolutely correct, my first thought was just to buy a full frame DSLR/mirrorless camera which would give me the FOV without the expense of a new scope, I'm just a bit nervous about going in that direction as I'm only just getting proficient with the CCD.
I was afraid it might be step backwards with no cooling. I'd have to say I'm impressed by the results achieved with DSLR's though & I haven't ruled that out. I'm interested in your views on that too.
Thanks for the input.
Tony
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Old 11-11-2019, 09:35 PM
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The SkyRover on paper seems hard to beat.

A DSLR is not going to compete with an SBIG 8300.

Petsval designs seem to be a great imaging design.

70mm is still a reasonable aperture for the price. 61mm is getting pretty small. F4.5 at 61mm versus F5 at 70mm should be faster with the larger aperture.

Greg.
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Old 11-11-2019, 09:44 PM
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Quote:
Originally Posted by gregbradley View Post
The SkyRover on paper seems hard to beat.

A DSLR is not going to compete with an SBIG 8300.

Petsval designs seem to be a great imaging design.

70mm is still a reasonable aperture for the price. 61mm is getting pretty small. F4.5 at 61mm versus F5 at 70mm should be faster with the larger aperture.

Greg.
Thanks Greg, this my thinking as well.
Cheers,
Tony
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Old 12-11-2019, 04:19 AM
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Thanks to all who replied, I ended up buying the Sky Rover.
When it arrives I'll post a rundown on it.
Cheers,
Tony
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Old 12-11-2019, 08:00 AM
casstony
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Staying with cooled cameras seems wise in QLD.
My modified d5600 is brilliant in Victoria and I like the simplicity of imaging with a dslr.

Looking forward to your thoughts on the Skyrover Tony - it's always exciting having a new scope in the mail
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Old 12-11-2019, 12:49 PM
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Yes I would love to read a review of this scope. Both of the choices seem very well made.

Greg.
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Old 12-11-2019, 01:01 PM
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Ant0nio (Tony)
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Quote:
Originally Posted by casstony View Post
Staying with cooled cameras seems wise in QLD.
My modified d5600 is brilliant in Victoria and I like the simplicity of imaging with a dslr.

Looking forward to your thoughts on the Skyrover Tony - it's always exciting having a new scope in the mail
Quote:
Originally Posted by gregbradley View Post
Yes I would love to read a review of this scope. Both of the choices seem very well made.

Greg.
I'll keep you posted.
Tony
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Old 12-11-2019, 04:38 PM
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Originally Posted by Ant0nio View Post
Thanks to all who replied, I ended up buying the Sky Rover.
When it arrives I'll post a rundown on it.
Cheers,
Tony
Where did you buy it from?
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Old 12-11-2019, 04:50 PM
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There's a link to their website at the top of this thread Nik, then click the link to "authorized".
Tony
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Old 12-11-2019, 06:12 PM
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it's all in chinese i cant make head or tail of it
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Old 12-11-2019, 08:27 PM
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it's all in chinese i cant make head or tail of it
Sounds like you need to change your browser settings to auto translate Nick.
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Old 12-11-2019, 08:45 PM
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I tried that but it still did my head in the checkout section doesnt work and it asks for a login, don't they do an english language webpage?
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Old 12-11-2019, 08:52 PM
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I emailed Sky Rover directly Nick. They're pretty helpful.
Cheers,
Tony
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