Argh .. if you guys noticed ..the past 3 nights were really clear ... except for some turbulence and twinkling stars ..There were very few clouds and I could actually see constellations while casually walking ...
Today .... rain rain rain .... can't even see full moon ... Weixing!!!!
Cheers!
Jeremy
WO 10th Anniversary Scope
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starfinder
- Posts: 1039
- Joined: Tue May 25, 2004 11:15 pm
- Location: River Valley / Tanglin Road
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The scope's fit and finish looks fabulous!
Now there are so many 80mm-class APO scopes on the market (even WO has about 3 APO models in the 80mm range), we are spoilt for choice. But that makes deciding which one rather difficult.
For starters, apart from price, portability issues, etc, anyone knows how the colour correction on the following scopes compare with each other?
1. WO Zenithstar 80mm Fluorite Doublet APO (this one).
2. WO Megrez 80 II ED Triplet APO, which was just sold by Arief
3. WO Megrez 80 triplet fluorite APO
4. Celestron C80ED / Orion ED80 / Skywatcher Pro 80ED (all use the same "ED" doublet lens set, with one element said to be made of fluorite).
5. Televue 85mm
6. Takahashi FS-78 / FC-76 (fluorite doublets)
Now there are so many 80mm-class APO scopes on the market (even WO has about 3 APO models in the 80mm range), we are spoilt for choice. But that makes deciding which one rather difficult.
For starters, apart from price, portability issues, etc, anyone knows how the colour correction on the following scopes compare with each other?
1. WO Zenithstar 80mm Fluorite Doublet APO (this one).
2. WO Megrez 80 II ED Triplet APO, which was just sold by Arief
3. WO Megrez 80 triplet fluorite APO
4. Celestron C80ED / Orion ED80 / Skywatcher Pro 80ED (all use the same "ED" doublet lens set, with one element said to be made of fluorite).
5. Televue 85mm
6. Takahashi FS-78 / FC-76 (fluorite doublets)
It becomes hot discussions in
http://www.cloudynights.com/ubbthreads/ ... /fpart/all
The 80 ED triplet shows blue halo around stars photographically (from the link above). I wonder why there is very few information on astrophotographic perfermance of WO 80 mm scopes.
Anat
http://www.cloudynights.com/ubbthreads/ ... /fpart/all
The 80 ED triplet shows blue halo around stars photographically (from the link above). I wonder why there is very few information on astrophotographic perfermance of WO 80 mm scopes.
Anat
Probably because most people (like me) who bought it use it mainly for visual. If I bother to set up my photographic equipment, I want to make sure that the scope is something at least 4", refractor or not.anat wrote:I wonder why there is very few information on astrophotographic perfermance of WO 80 mm scopes.
Cheers!
[80% Steve, 20% Alfred] ------- Probability of Clear Skies = (Age of newest equipment in days) / [(Number of observers) * (Total Aperture of all telescopes present in mm)]
I think it depends on whether you're using the old ED triplet lens or the newer one (William told me when he sent the lens upgrade that this one will be significantly better in term of color correction than the older lens)It becomes hot discussions in
http://www.cloudynights.com/ubbthreads/ ... /fpart/all
The 80 ED triplet shows blue halo around stars photographically (from the link above). I wonder why there is very few information on astrophotographic perfermance of WO 80 mm scopes.
Anat
Btw, from the above list, the color correction will be like this (1 is best) - (this is my opinion only, do your own research):
1. WO Megrez 80 triplet fluorite APO
2. Takahashi FS-78 / FC-76 (fluorite doublets)
3. The rest - tie
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weixing
- Super Moderator
- Posts: 4708
- Joined: Wed Oct 01, 2003 12:22 am
- Favourite scope: Vixen R200SS & Celestron 6" F5 Achro Refractor
- Location: (Tampines) Earth of Solar System in Orion Arm of Milky Way Galaxy in Local Group Galaxies Cluster
Hi,
Have a nice day.
If can, everyone will want to use a big scope for imaging, but sometime you just can't use a big scope, especially if you want to take wide field object... because the longer the focal length the smaller the FoV.Probably because most people (like me) who bought it use it mainly for visual. If I bother to set up my photographic equipment, I want to make sure that the scope is something at least 4", refractor or not.
Have a nice day.
Yang Weixing
"The universe is composed mainly of hydrogen and ignorance."
"The universe is composed mainly of hydrogen and ignorance." 
Which reminds me... I'm eyeing the 120mm F/5: Large aperture + shorter focal length. That'll be for photography...although not APO. Also I have been corrected in another Forum that WO did NOT list the 10th Anniversary Scope as APO!weixing wrote:If can, everyone will want to use a big scope for imaging, but sometime you just can't use a big scope, especially if you want to take wide field object... because the longer the focal length the smaller the FoV.
120mm F/5: Here
[80% Steve, 20% Alfred] ------- Probability of Clear Skies = (Age of newest equipment in days) / [(Number of observers) * (Total Aperture of all telescopes present in mm)]