Search found 12 matches

by BlueOysterCult
Mon May 02, 2016 10:59 am
Forum: General Astronomy
Topic: Einstein Simplified
Replies: 1
Views: 10190

Re: Einstein Simplified

Special relativity is very easy to understand. You can either pick up a book dedicated to that, or any first year physics textbook.
It is only through the equations that you can appreciate the ideas behind the theory.
by BlueOysterCult
Mon May 02, 2016 10:50 am
Forum: Equipment Discussions
Topic: Seeking opinion on celestron astrograph
Replies: 0
Views: 1515

Seeking opinion on celestron astrograph

Do anyone have any opinion on celestron RASA astrograph?
How will it perform in singapore?
What mount is good for it?

tia
by BlueOysterCult
Mon Oct 05, 2015 2:56 am
Forum: General Astronomy
Topic: Martian Landscapes
Replies: 0
Views: 8461

Martian Landscapes

2D elevation contour images were obtained from NASA's MOLA, then a custom code was written to generate the 3D CAD models.

Image
Acheron Fossae, looking from west.

Image
Acheron Fossae, looking from east.
by BlueOysterCult
Tue Feb 03, 2015 10:37 pm
Forum: Beginners Forums
Topic: Newbie here
Replies: 18
Views: 13705

Re: Newbie here

It's M106 in Ursa Major.
Was using the Orion G3 monochrome camera.
by BlueOysterCult
Tue Feb 03, 2015 9:16 pm
Forum: Beginners Forums
Topic: Newbie here
Replies: 18
Views: 13705

Re: Newbie here

Thank you everyone. Finally got my kit together.
Managed to purchase a second hand William Optics Megrez 80 and a Vixen Sphinx SXW for $1.2k
Did a test shot and am very happy to get lots of galaxies at first try.

Image
by BlueOysterCult
Tue Sep 02, 2014 10:23 pm
Forum: Beginners Forums
Topic: Newbie here
Replies: 18
Views: 13705

Re: Newbie here

I am considering the Sky 90, FSQ 85 or the William Optics GTF81.
The Sky 90 and WO GTF81 are priced way lower than the FSQ 85. Is the extra cost for the FSQ 85 worth it?
by BlueOysterCult
Sun Aug 31, 2014 5:23 pm
Forum: Beginners Forums
Topic: Newbie here
Replies: 18
Views: 13705

Re: Newbie here

It doesn't matter. All of them should be able to reach focus. The only thing you should care about is the distance for the reducer/flattener to the camera, which should be correct if you are using the tak camera adapters. In the case of the FSQ 85ED when reducer is used, the back focus listed is 82...
by BlueOysterCult
Sat Aug 30, 2014 4:01 pm
Forum: Beginners Forums
Topic: Newbie here
Replies: 18
Views: 13705

Re: Newbie here

Thank you everyone for the kind advice.

Can anyone tell me the difference between metal back distance and back focus distance?
At first I thought they mean the same, but Takahashi quotes different figures for both, so I am not sure what to make of it.
by BlueOysterCult
Sun Aug 24, 2014 10:11 pm
Forum: General Astronomy
Topic: One from Justin Ng
Replies: 4
Views: 10337

Re: One from Justin Ng

Beautiful shots! What scope/mount does he use?
by BlueOysterCult
Sun Aug 24, 2014 10:10 pm
Forum: Beginners Forums
Topic: Newbie here
Replies: 18
Views: 13705

Re: Newbie here

The image circle is 45mm. This is much smaller than APS-C. Do I still need flats?