Posted 14 July 2013 - 11:34 PM
Posted 15 July 2013 - 10:29 AM
Posted 15 July 2013 - 05:57 PM
Mullet you obviously didn't hear a word the critics have said. That scope can't be any good. Mike
Looking forward to seeing the pictures and report on this one.
Posted 15 July 2013 - 10:16 PM
This is a very well built scope, solid. Focused is an IStar as well, no complainants there, not a FT but still good. Report to come tomorrow.
Posted 15 July 2013 - 10:47 PM
Posted 15 July 2013 - 11:47 PM
This scope is easily handled by the g11, vibrations well less than 1 second, focusing manually not an issue.
The triplet is very heavy, but again, g11 is taking this scope in stride.
Posted 15 July 2013 - 11:53 PM
What are the specs on the scope (doublet or triplet? glass types used? focal ratio? etc.). Also are there any spot diagrams for the optic? I didn't see a "Forfax" listed on the Istar website. Is it maybe a discontinued or a newly introduced model? 140mm is a nice portable, but still large (for a refractor) aperture.
Istar used to do a 140mm F12 (LTT140 ?) I think there was a review on CN last year, I assume this is the same scope.
Very long at 1680mm FL so would have quite a moment arm and need a solid mount.
There was one on Astromart for $2500 last year from memory.
Good luck with your new scope Mullet.
Number of Elements: 3
Type: Super Apochromatic Triplet
Lens Coating: Full Multi-Coated
Clear Aperture: 140 mm (5.5 inches)
Lens Diameter: 144 mm
Focal Ratio: f/12
Focal Length: 1680mm
OTA Weight: 13.9 kg - 30.6 lbs. (including focuser reduction and cap)
Posted 16 July 2013 - 12:09 AM
Posted 16 July 2013 - 04:16 AM
Apo's. They told me Istar no longer make Apo's.
Posted 17 July 2013 - 11:17 AM
Going to get some deep sky next.
Posted 17 July 2013 - 01:37 PM
Posted 17 July 2013 - 02:35 PM
Posted 17 July 2013 - 03:02 PM
Posted 17 July 2013 - 03:09 PM
Colors seen on planet are exact as seen in the CPC 1100, details are plainly evident and comparable to the CPC being that the CPC does not take magnification as well as the refactor.
And more specifically, this IStar apo is only performing the same as a poor performing C11? 127x (22mm) in a C11 is loafing along. Is the collimation out?
Posted 17 July 2013 - 03:13 PM
Posted 17 July 2013 - 07:06 PM
On the C11 a power of 233x is a 1.2mm exit pupil. That should not be the limit for planets if the seeing is even half-way reasonable.
So comparing what seems to be a C11 with problems with any other telescope is not informative, because that C11 appears to have problems and isn't performing at a normal level for a C11.
Posted 17 July 2013 - 07:45 PM
Posted 17 July 2013 - 10:12 PM
Posted 17 July 2013 - 11:40 PM
Posted 18 July 2013 - 01:54 AM
I understand that cooling (and tube currents) can have an effect but not seeing conditions.