A Space & astronomy forum. SpaceBanter.com

Go Back   Home » SpaceBanter.com forum » Astronomy and Astrophysics » Amateur Astronomy
Site Map Home Authors List Search Today's Posts Mark Forums Read Web Partners

Rich field telescope?



 
 
Thread Tools Display Modes
  #1  
Old March 12th 19, 10:23 AM posted to sci.astro.amateur
StarDust
external usenet poster
 
Posts: 732
Default Rich field telescope?

Seems, hew design?

https://op2.0ps.us/978-550-ffffff-no...2s-00-main.jpg
  #2  
Old March 12th 19, 10:24 AM posted to sci.astro.amateur
StarDust
external usenet poster
 
Posts: 732
Default Rich field telescope?

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
  #3  
Old March 12th 19, 04:17 PM posted to sci.astro.amateur
JBI
external usenet poster
 
Posts: 11
Default Rich field telescope?

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.
  #4  
Old March 12th 19, 06:42 PM posted to sci.astro.amateur
StarDust
external usenet poster
 
Posts: 732
Default Rich field telescope?

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?
  #5  
Old March 13th 19, 08:52 AM posted to sci.astro.amateur
RichA[_6_]
external usenet poster
 
Posts: 1,076
Default Rich field telescope?

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.
  #6  
Old March 13th 19, 11:02 AM posted to sci.astro.amateur
StarDust
external usenet poster
 
Posts: 732
Default Rich field telescope?

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!
  #7  
Old March 13th 19, 12:48 PM posted to sci.astro.amateur
Martin Brown[_3_]
external usenet poster
 
Posts: 189
Default Rich field telescope?

On 13/03/2019 07:52, 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.


The only real innovation is hiding the star diagonal in the main tube.

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.


Fast refractors and wide fields tend to be demanding on eyepieces too.
There is no free lunch.

--
Regards,
Martin Brown
  #8  
Old March 13th 19, 01:20 PM posted to sci.astro.amateur
StarDust
external usenet poster
 
Posts: 732
Default Rich field telescope?

On Wednesday, March 13, 2019 at 4:48:27 AM UTC-7, Martin Brown wrote:
On 13/03/2019 07:52, 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.


The only real innovation is hiding the star diagonal in the main tube.

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.


Fast refractors and wide fields tend to be demanding on eyepieces too.
There is no free lunch.

--
Regards,
Martin Brown


I think, this system is a step simpler than Newts, no CO, it has no primary mirror, front lens is focusing light to a secondary 45 deg mirror in the back, which diverts the light to outside.
My guess!!!!!
  #9  
Old March 13th 19, 02:49 PM posted to sci.astro.amateur
Martin Brown[_3_]
external usenet poster
 
Posts: 189
Default Rich field telescope?

On 13/03/2019 12:20, StarDust wrote:
On Wednesday, March 13, 2019 at 4:48:27 AM UTC-7, Martin Brown wrote:
On 13/03/2019 07:52, 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.


The only real innovation is hiding the star diagonal in the main tube.

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.


Fast refractors and wide fields tend to be demanding on eyepieces too.
There is no free lunch.


I think, this system is a step simpler than Newts, no CO, it has no primary mirror, front lens is focusing light to a secondary 45 deg mirror in the back, which diverts the light to outside.
My guess!!!!!


That is obvious. You don't need to guess.
It is equivalent to a basic f4 refractor and a star diagonal.

There are other options in a similar vein with more conventional design:

http://www.opticalvision.co.uk/astro...l-102_az3.html

or

https://www.telescopehouse.com/teles...-assembly.html

or

https://www.telescopehouse.com/teles...refractor.html

Though some are going to be a bit longer. Anything faster than f5 is
going to be pushing it in terms of eyepieces that will work well.

Photographically the f ratio makes a difference to field of view and
exposure times.

Visually only the magnification and AFOV of the eyepiece matters.

100mm f4 = 400mm fl & 20mm eyepiece = 20x & 28mm eyepiece ~ 14x
100mm f5 = 500mm fl & 25mm eyepiece = 20x & 35mm eyepiece ~ 14x

Ultimately the view is limited by the field stop on 2" eyepieces.

--
Regards,
Martin Brown
  #10  
Old March 13th 19, 11:43 PM posted to sci.astro.amateur
RichA[_6_]
external usenet poster
 
Posts: 1,076
Default Rich field telescope?

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.

 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
An Incredibly Rich Star Field in Canis Major Davoud[_1_] Amateur Astronomy 23 December 21st 09 12:47 AM
Urban Richest-Field Telescope? Margo Schulter Amateur Astronomy 9 October 2nd 07 11:27 AM
Is 1/4 wave good enough for a rich field? donutbandit Amateur Astronomy 18 November 27th 03 02:13 AM
Rich Field Refractor? Alan Buttivant Misc 8 November 17th 03 06:32 AM
Building a simple rich field telescope? + laser printer [email protected] Amateur Astronomy 0 July 14th 03 05:16 PM


All times are GMT +1. The time now is 10:21 AM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 SpaceBanter.com.
The comments are property of their posters.