Chromatic Abberration in eyeballPosted By Roland Christen |
What scope?
Posts Made By: Roland Christen
November 11, 2008 11:28 PM
Forum:
Equipment Talk
November 19, 2008 12:15 AM
Forum:
Refractors
CollimationPosted By Roland Christen |
When a manufacturer wants to save money, they sometimes make the end consumer the QA department. So, get out your screw driver and adjust away. 
Rolando
Rolando
November 19, 2008 01:58 AM
Forum:
Equipment Talk
Re: meade lx200r 12"Posted By Roland Christen |
>> would love to go gearless -- no more worm gear replacement, no more periodic error hassle!>>
There are some disadvantages to that scheme. One is the need for lots of power! Like 20 amp at 48 volt supply to make it work. Also, forget parking because as soon as you turn off the power, both axes go limp and can rotate unhindered. So, if you are out of balance, the axis will swing wild.
Rolando
There are some disadvantages to that scheme. One is the need for lots of power! Like 20 amp at 48 volt supply to make it work. Also, forget parking because as soon as you turn off the power, both axes go limp and can rotate unhindered. So, if you are out of balance, the axis will swing wild.
Rolando
November 21, 2008 12:28 AM
Forum:
CCD Imaging and Processing/Deep Sky
OT: Astronomy Magazine articlePosted By Roland Christen |
Congratulations! I just saw this article today. Nicely done.
Rolando
Rolando
November 21, 2008 09:38 PM
Forum:
CCD Imaging and Processing/Deep Sky
Last glimpse of (wild) ducks.Posted By Roland Christen |
I would recommend checking your focus every 15 minutes if the temperature is falling. Shorten your exposure time until the stars are round. For this bright object and for the 16" aperture, you should have plenty of light to register stars. For best resolution you would reduce the exposure time and increase the number of frames that you want to stack.
The oval stars may not be due to tracking, but could indeed be due to tube currents. You can verify that by changing the focus point and noting the shape and direction of the ovality. At some sweet spot the focus will be best and the stars will be round.
Even if the stars are somewhat oval, you can fix a small amount of ovality in photoshop by stacking a copy of each frame and using the Darken mode to make the stars round (see attached image). It will not fix coma issues, but will fix small amounts of ovality.
Rolando
The oval stars may not be due to tracking, but could indeed be due to tube currents. You can verify that by changing the focus point and noting the shape and direction of the ovality. At some sweet spot the focus will be best and the stars will be round.
Even if the stars are somewhat oval, you can fix a small amount of ovality in photoshop by stacking a copy of each frame and using the Darken mode to make the stars round (see attached image). It will not fix coma issues, but will fix small amounts of ovality.
Rolando
November 22, 2008 10:40 PM
Forum:
CCD Imaging and Processing/Deep Sky
M37Posted By Roland Christen |
Excellent!
Rolando
Rolando
November 24, 2008 03:25 PM
Forum:
Refractors
Testing ObjectivePosted By Roland Christen |
Why do you need to know the exact design?
Rolando
Rolando
December 1, 2008 08:15 AM
Forum:
CCD Imaging and Processing/Solar System
Moon, Venus, Jupiter from HawaiiPosted By Roland Christen |
And if that last one wasn't fun, this one came later on with the moon and clouds playing together, and I swear it looks like Santa peering down on us.
Rolando
Rolando
December 1, 2008 08:19 AM
Forum:
Astro-Physics
Moon, Venus and Jupiter from HawaiiPosted By Roland Christen |
And if that last one wasn't fun, this one came later on with the moon and clouds playing together, and I swear it looks like Santa peering down on us.
Rolando
Rolando
December 16, 2008 12:38 AM
Forum:
Refractors
A. JaegersPosted By Roland Christen |
You are one of several guys that I know about who worked there. Would be interesting to hear your story. I did know about the Cubans. Also heard that the temperature in the polishing room was always above 80 degrees - a real sweat shop.
Rolando
Rolando
Funding Member
