Clear skies, Erik
Visual astronomer since 1978.
Matthias Wirth 16" f/5
Takahashi FS-102 NSV on EM-10
Celestron 1983 C5
Zeiss, TeleVue and Celestron eyepieces
Nikon 18x70 IF-WP Zeiss Victory FL 7x42 Zeiss Victory FL 10x32
Quote:Which would you prefer for observing around the backyard and occasional transportation to a dark site: a 12.5" f/5 Portaball with Zambuto optics, or a Normand Fullum 10" f/4.8 with Fullum optics? Price is roughly the same.The dob will be used as a complementary scope to my Tak FS102.Thanks for any experiences with scopes and/or mirror/image quality.CS,Erik
Home-built Newt: 10" f/4.5 Royce conical primary, Skywatcher NEQ6 (Astrotroniks tuned) iEQ45, Duo-T, 8" f/4 Skywatcher Quattro CF 120 ED f/7.5 Skywatcher Black Diamond 80ED Stellarvue
Live Life Right. Aim High, Think High
Zhumell Z8. C6-SGT / ZEQ25GT. AR102 / WO Z71.
Celestron 15 x 70 / Nikon 10 x 50 action series. Modest range of eyepieces, TV Barlow, Diagonals, FR's. Skytracker / Astronomik CLS II.
Canon 70D / 550D.
Quote: Like Nasa clean vs. Steampunk Fantasy.
Quote: or 2001 a space odyssey vs avatar
-DannyMy warehouseMy Channel
Quote:Normand Fullum makes excellent optics - I doubt you would notice a difference between a Zambuto and a Fullum mirror in use. I also doubt you'll notice much difference in aperture.
14.5" Starmaster 10" Portaball 10" Orion XT10 ES 127ED 90mm F/5.5 ED Astrotech Coronado PST A few eyepieces and Earthwin binos
Quote: I also doubt you'll notice much difference in aperture.
Quote:Quote:Normand Fullum makes excellent optics - I doubt you would notice a difference between a Zambuto and a Fullum mirror in use. I also doubt you'll notice much difference in aperture. In terms of contrast, you may notice a difference as Zambuto really attends to physical issues that affect contrast. In terms of not noticing the difference between 10" and 12.5" of aperture, it is absured to say that you will not notice a difference unless you are a newbie. I happen to have owned a 10" Zambuto/Teleport and a 12.5" Stevens/Portaball and the images/performances were not equal in ANY way. Bob
Happy owner of--
A Mag 1, 12.5 inch Porta Ball
A Dual Axis Equatorial Platform
A PST Double Stack
Quote: ... It's like going from an 80mm to a 100mm refractor, it is there to be seen....
Too many scopes - my wife wants back her family room...
Quote: The only "gotcha" on the design is balance - overly light or too heavy eyepieces can cause issues. This was very rare for me, and really only happened when I had too much wax on the sphere. I did have issues when I tried to use both a 50mm right angle finder and a 20mm Nagler at the same time - it was just too much an it over-balanced the scope.
Quote: The glassmongery and accessories must be appropriate for the Portaball's balance.
Quote: Quote: I also doubt you'll notice much difference in aperture. I have both a 10 inch and a 12.5 inch... the difference is not overwhelming but it is significant and if one hunting down faint galaxies, the 56% increase in light grasp is definitely useful. It's like going from an 80mm to a 100mm refractor, it is there to be seen.Jon
18" f/4.2 homebuilt truss 12.5" f/6 hybrid tube dob