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Rich field telescope?



 
 
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  #11  
Old March 14th 19, 03:47 AM posted to sci.astro.amateur
StarDust
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Posts: 732
Default Rich field telescope?

On Wednesday, March 13, 2019 at 3:43:19 PM UTC-7, RichA wrote:
On Wednesday, 13 March 2019 06:02:28 UTC-4, StarDust wrote:
On Wednesday, March 13, 2019 at 12:53:02 AM UTC-7, RichA wrote:
On Tuesday, 12 March 2019 13:42:52 UTC-4, StarDust wrote:
On Tuesday, March 12, 2019 at 8:17:07 AM UTC-7, JBI wrote:
On 3/12/19 5:24 AM, StarDust wrote:
On Tuesday, March 12, 2019 at 2:23:23 AM UTC-7, StarDust wrote:
Seems, hew design?

https://op2.0ps.us/978-550-ffffff-no...2s-00-main.jpg

https://shop.opticsplanet.com/bresse...SABEgI5RPD_BwE


This scope has been around for nearly two years. Reviews aren't great,
but typical for the price and wide field. Google is your friend.

That's what it says, rich-field!
But is it flat field or what?

Just a plain Fraunhofer achromat and a fast one. Will have a bit of colour, not great for planets.


No rich-field scope is good for planets!
Made for photo and wide fields!


1. No, low-power, high-aberration rich-field achromats are the worst for planets.
2. Low-power scopes are poor choices for imaging planets.
3. Colour error bloats star images in deepsky photos.


This scope, I don't think can be used for photo either with that plastic focuser in the back?
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  #12  
Old March 14th 19, 02:53 PM posted to sci.astro.amateur
RichA[_6_]
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Posts: 1,076
Default Rich field telescope?

On Wednesday, 13 March 2019 22:47:56 UTC-4, StarDust wrote:
On Wednesday, March 13, 2019 at 3:43:19 PM UTC-7, RichA wrote:
On Wednesday, 13 March 2019 06:02:28 UTC-4, StarDust wrote:
On Wednesday, March 13, 2019 at 12:53:02 AM UTC-7, RichA wrote:
On Tuesday, 12 March 2019 13:42:52 UTC-4, StarDust wrote:
On Tuesday, March 12, 2019 at 8:17:07 AM UTC-7, JBI wrote:
On 3/12/19 5:24 AM, StarDust wrote:
On Tuesday, March 12, 2019 at 2:23:23 AM UTC-7, StarDust wrote:
Seems, hew design?

https://op2.0ps.us/978-550-ffffff-no...2s-00-main.jpg

https://shop.opticsplanet.com/bresse...SABEgI5RPD_BwE


This scope has been around for nearly two years. Reviews aren't great,
but typical for the price and wide field. Google is your friend.

That's what it says, rich-field!
But is it flat field or what?

Just a plain Fraunhofer achromat and a fast one. Will have a bit of colour, not great for planets.

No rich-field scope is good for planets!
Made for photo and wide fields!


1. No, low-power, high-aberration rich-field achromats are the worst for planets.
2. Low-power scopes are poor choices for imaging planets.
3. Colour error bloats star images in deepsky photos.


This scope, I don't think can be used for photo either with that plastic focuser in the back?


Well, any scope can be used as a camera lens as long as it has a way to attach a camera, but it's an alt-azimuth mount so you'd be limited to terrestrial and moon/sun shots.
  #13  
Old March 21st 19, 01:04 AM posted to sci.astro.amateur
[email protected]
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Posts: 9,472
Default Rich field telescope?

On Tuesday, March 12, 2019 at 5:24:16 AM UTC-4, StarDust wrote:
On Tuesday, March 12, 2019 at 2:23:23 AM UTC-7, StarDust wrote:
Seems, hew design?


-cut-

This isn't what I would choose or recommend for the price shown, but I wouldn't pan it either. The inclusion of the 7x50 binocular is problematic, because the FOV isn't specified. The eyepiece might be nice to have, at 70-deg AFOV. You get a case too. Maybe the tripod can be used with other equipment.

I would rather a beginner get a larger-aperture Newtonian and a binocular of his/her own choosing.

 




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