I think you're worth a double serving of happiness!Tal-200K (#199) with JMI NGF-Mini2M focuser on GEM3 • Astro-Tech AT80ED • Orion Sirius EQ-G with wireless EQDIRECT • Astro-Tech Voyager • Celestron Regal LX 10x42 • Helios 15x70 ATM projects: 14" f/5 truss Dobson: first light Jul 1, 2011 - currently in 'tweak & widget' mode
A 60mm department store refractor started it all....
16.5 inch f 5.3 Zambuto optics homebuilt Dob
8 inch f 8 homebuilt Dob
Fraser Valley Astronomers Society Director
Quote:Hi Tim,I would say you have to test them on the planets. I have 13.1" dob yep old coulter but Carl Zambuto refigured the mirror in 1995 and it's 1/11th wave where before it was 1/2 wave. My scope performs better on planets 312x is easy and have pushed it to over 700x before. It rivals 6" APO refractors on planetary detail. It also does better on globulars and detail on nebulas. I am not surprised the discovery scope was brighter it has more aperture in the review and more surface area. Carl Zambuto does make some fine mirrors and never seen a bad one. You can get to that 50x magnification per inch if the seeing is right with his optics. But with a dob without tracking sometimes that is hard to do.Good article enjoyed the review. One of our club members has a discovery premium dob 17.5" and enjoys it and it does have good optics too.James Bielaga
Jeff Morgan - Wile E. Coyote School of Telescope Making
ATM Nut.6" F15 Jaegers Refractor on Homebuilt EQ mount12.5" Homebuilt NewtProjects:16" F7.2 Reflector
“I am the only person to ever ace a 1951 USAF resolution test. My 'to observe' list says 'done'. I do not use charts or atlases when I starhop; men do not use maps. One of my sketches won an SBIG deep sky imaging contest. I am the life of star parties I have never attended. I never say anything looks like a faint fuzzy - not even a faint fuzzy. Pilots aim green laser pointers at me. Don Pensack proofreads my CN forum posts.” - The Most Interesting Astronomer in the Universe
Meade 16" f/4.5 Lightbridge M42 w/Paracorr & "Crossbow" EQT-200 Equatorial Platform
Meade AR-6 w/10:1 Dual Speed Crayford Focuser
Meade ETX-125 Terabeam/Wegat
Orion ST80 w/single speed Crayford Focuser
CGEM Hypertuned by Deep Space Products
Quote:Finally, we are only observing with one sample of each manufacturer's optics. That means we can only know how these particular optics performed, which tells us almost nothing about how any other optics would compare from both manufacturers.
Quote:Jeff,Your right in saying there are clear levels of optics and that their optical performance directly correlates with their price tag. However, what I am trying to answer is different.My question is about the Zambuto seven criteria. Do they translate to an observable difference in contrast over other premium optics? Does perfection of the small scale features of the mirror truly make a difference? This is a hard concept to grasp and something that I really only noticed on those special nights of good viewing when I saw detail in specific targets that I never saw before with other optics on equally good nights of viewing. Others have had similar experiences, but is it real? Tim Neubert
The opinions expressed herein are solely mine as an amateur astronomer hobbyist & consumer. Information herein was correlated from experience, discussions with others, & research from multiple sources freely available at time of posting. All reasonable care & skill was used, but no warranty is made as to accuracy, & liability cannot be accepted for errors/omissions. This is for information only and not intended nor implied to be a substitute for professional advice.
The night sky is the canvas....
My optics are the brush....
The Milky Way is the masterpiece
reductio ad absurdum of epistomology is solipsism....
Quote:Reminds my of the old saying..."one robin does not herald Spring..."n of 1 is not a significent sample...period.
"I have been paddling in the shallows of a great ocean of knowledge." - Sir Isaac Newton * * 15" F4.55 Starsplitter Dob & a Denk II binoviewer * * http://peaceofsky.wordpress.com/ Pacheco State Park Fremont Peak
Quote:I have read several 'good' reports as to Discovery's mirror quality, however the 14" I bought several years ago is nothing to brag about. Oh its fine for deep sky, which is what I use it for, but fails badly on planetary.
Calypte Anza, California
Keep looking up !!
"Imagination is more important than knowledge" - Einstein
Home made 16" f5 Terry Ostahowski optics - ArgoNavis/ServoCAT
ES 30 mm, Ethos 21, 13 and 10 mm, Paracorr II, Antares Barlow 2" 1.6X
2" DGM NPB filter
2" Catseye Cheshire/Sight tube - 2" Howie Glatter laser + Tublug
Quote:In the ones that were optimized, though, I've generally seen that the star images are a little tighter and have a little less "fuzz" in the edges and/or diffraction rings in the Zambuto-mirrored scopes--obviously less light scatter.
Quote:Justifying Zambuto's decision not to use enhanced coatings. Apparently his rationale for using only standard coatings. Or at least that is what he used to say. Is he still recommending standard coatings only? I belong to the ZOC yahoo group, but have not kept up with the most recent posts.
Quote: .... so what it really boils down to is the quality of the coating, and most coaters who offer enhanced coatings are pretty good at it. The ones we've tested here were very good.