Search found 387 matches

by DRatledge
Fri Dec 23, 2016 2:59 pm
Forum: Astrophotography
Topic: CCD or DSLR
Replies: 0
Views: 3939

CCD or DSLR

What is the difference between a 12-inch telescope with a cooled CCD camera and 4-inch with an uncooled Canon DSLR? Below are two equal total length exposures (5 hours) of the Pisces Cloud Galaxy Cluster - they were shot simultaneously. The 12 incher + CCD has reached at least magnitude 21 and the 4...
by DRatledge
Wed Nov 30, 2016 12:38 pm
Forum: Member Observations - Blogging
Topic: Fainter than faint
Replies: 0
Views: 3601

Fainter than faint

Was asked by Owen Brazell if I had an image of planetary Nebula Abell 5. The big dob boys had been unable to see it - they generally use an Oxygen OIII filter on PN. I now know why it is difficult (impossible) to see as it has the faintest OIII signal I have ever recorded. Below is 4 hours worth of ...
by DRatledge
Mon Nov 07, 2016 9:42 am
Forum: Member Observations - Blogging
Topic: This month's mystery object
Replies: 10
Views: 11120

Re: This month's mystery object

It would have been easier if it was in colour! I can remember drawing this in 1963 and watching the movement!
by DRatledge
Mon Oct 31, 2016 5:03 pm
Forum: Club events
Topic: Show & tell, 1st November
Replies: 6
Views: 8258

Re: Show & tell, 1st November

I can give an update on the ADC - the mark2 version..........
by DRatledge
Wed Oct 12, 2016 11:37 am
Forum: Astrophotography
Topic: Kelling Heath 2016 - Full of stars
Replies: 2
Views: 5149

Re: Kelling Heath 2016 - Full of stars

Andy, The main stars of Hercules (the keystone) are at the right edge of this crop. Polaris is way further north. In the procesed version of this image in the gallery the general background stars have been reduced down with the bright stars emphasised using SBLUR in Iris - this is the amost magical ...
by DRatledge
Thu Oct 06, 2016 11:23 am
Forum: Astrophotography
Topic: Kelling Heath 2016 - Full of stars
Replies: 2
Views: 5149

Kelling Heath 2016 - Full of stars

Below is part of a constellation shot of Hercules before processing. Gives some idea of the number of stars visible from Kelling Heath. No wonder we struggle to work out which is the pole star when polar aligning!

Prize for who counts them and gets the right answer!
by DRatledge
Mon Sep 26, 2016 1:00 pm
Forum: Computers and astronomy
Topic: Windows 10 update
Replies: 3
Views: 5207

Re: Windows 10 update

I've set my tripod to 53 degrees so when I put the tracker on it then the polar scope should be pointing at the right Polaris. For those that have not been to Kelling Heath there are so many stars visible finding the right one can be tricky.
by DRatledge
Thu Sep 22, 2016 4:12 pm
Forum: Equipment - Help
Topic: Recommendations for higher magnification EP?
Replies: 2
Views: 5426

Re: Recommendations for higher magnification EP?

I would be wary of going high power. The supplied eyepieces are likely to be low quality - often Kellner type. First step would be a better quality 25mm perhaps a plossl. These are not heavy and wont unbalance the scope. The x-cel eyepieces look heavy but i have not used one. The plossl should work ...
by DRatledge
Wed Sep 14, 2016 7:38 am
Forum: Observing - Discussion
Topic: Kelling Heath - getting in the mood
Replies: 2
Views: 5330

Kelling Heath - getting in the mood

Very much worth watching this video as it will certainly get you in the mood for the Equinox Star Party at Kelling Heath! Sure it's American but it captures the magic of what goes on at these events. https://player.vimeo.com/video/180637962 If you have never been to the Kelling Heath Star Party it w...
by DRatledge
Mon Jun 13, 2016 10:29 am
Forum: Astrophotography
Topic: Mars 2016
Replies: 5
Views: 8097

Re: Mars 2016

Well done Ross. It looks like seeing is more important than dispersion. It needs a warm balmy night.