Search found 1138 matches

by Canopus Lim
Sun Jan 12, 2014 3:37 pm
Forum: Astronomy Events & Observation Sessions
Topic: Observing Jupiter on 11 Jan 2014
Replies: 3
Views: 1260

Observing Jupiter on 11 Jan 2014

It has been close to 1 year since I brought out my 12.5" telescope to study Jupiter; as Jupiter rise very 'early' for months and I cannot wake up at 4 or 5am to observe it… Now Jupiter is rising earlier in the evening and at 11 plus PM it is high in the sky, prime for detailed observation of the det...
by Canopus Lim
Thu Jan 09, 2014 1:14 pm
Forum: Astrophotography
Topic: Quarter Moon picture with iPhone5
Replies: 5
Views: 2716

Re: Quarter Moon picture with iPhone5

Think there are 4 obsession telescopes in Singapore. The smartphone with its small lens can match the exit pupil of a large aperture telescope. This image is at around 100x magnification and with a ultra wide angle nagler eyepiece is able to cover more than a full moon. If I were to use 100x with sm...
by Canopus Lim
Wed Jan 08, 2014 10:26 pm
Forum: Astrophotography
Topic: Quarter Moon picture with iPhone5
Replies: 5
Views: 2716

Quarter Moon picture with iPhone5

Just took this picture through my 12.5" Obsession dob + paracorr + 17mm Nagler Eyepiece. The moon just fills up the width of the iPhone5 chip. I got a iPhone afocal adapter and was able to centre the phone quite well to the eyepiece. :) Attached is the link to the raw single image. http://postimg.or...
by Canopus Lim
Sun Sep 01, 2013 10:07 pm
Forum: General Astronomy
Topic: Colour of Jupiter's Great Red Spot (GRS)
Replies: 13
Views: 5834

Re: Colour of Jupiter's Great Red Spot (GRS)

Hi Gavin, Jupiter is pretty low that is why you won't be able to use higher power. Typically there is at least a difference of 100x useable magnification of Jupiter from low to high (close to Zenith). For my 12.5" my most used eyepiece is 5mm Pentax XO at 320x. It gives a pleasing 1mm exit pupil and...
by Canopus Lim
Sun Jun 16, 2013 12:00 am
Forum: Equipment Discussions
Topic: collimation on Laser Collimator
Replies: 9
Views: 3906

Re: collimation on Laser Collimator

Hi, For f/5, using barlowed laser collimation is sufficient to get very good results. Note that all lasers have some form of misalignment and also the 1.25"-2" adapter also have its own errors which will contribute in some way. However, using barlowed laser collimation technique for the primary mirr...
by Canopus Lim
Tue May 21, 2013 5:29 pm
Forum: Astrophotography
Topic: iPad image of the moon through 12.5" Obsession dob
Replies: 7
Views: 1314

Re: iPad image of the moon through 12.5" Obsession dob

Ha actually it started out I wanted to show my 20 month old daughter the moon. Was afraid she cannot view through the eyepiece so thought of using the iPad large screen to show her. Turned out she manged to view the 'big moon' when I carried her to the eyepiece. The iPad did manage to capture the mo...
by Canopus Lim
Sun May 19, 2013 11:03 pm
Forum: Astrophotography
Topic: iPad image of the moon through 12.5" Obsession dob
Replies: 7
Views: 1314

iPad image of the moon through 12.5" Obsession dob

Attached are two images I took by handholding my iPad looking through the eyepiece of my 12.5" telescope. They are unprocessed. Turns out not bad for such crude way of taking images. Considering that the iPad camera is pretty lousy and far inferior to a iPhone5 camera. 12.5" Obsession telescope + 17...
by Canopus Lim
Fri Apr 12, 2013 12:06 am
Forum: Equipment Discussions
Topic: "New" Obby!
Replies: 8
Views: 2115

Re: "New" Obby!

Yes thankfully my mom, wife and daughter were safe in the fire and were rescued by the firemen. All the things are back to what it was. :)
by Canopus Lim
Tue Mar 26, 2013 11:46 pm
Forum: General Astronomy
Topic: A New Toy - and First Light!
Replies: 13
Views: 4130

Re: A New Toy - and First Light!

Wow! Welcome to the Dob club! Quality aperture rules! :)