Group observing 29th November

Well, it was a very cold night but great fun, with loads of people taking part. I managed to get some quite pretty Orion shots.

Setup was SW 102 F5 refractor with a T2 to 2″ adaptor containing a 2″ Optolong UHC filter connected to an EOS 750D camera. This is the processing of the first of 3 sets of subs that I took. I like the colours. The pictures of the scopes were taken with iPhone 7 and NightCap app

I enjoyed the evening and it was nice to see some many members, and non-members involved

Two Images from 29 November in the cold :-)

I’m sure everyone at Rosliston last night will agree it was a really good evening. It was pretty cold, despite the sky being ‘full of flame’ 🙂

I imaged two targets with my 450D and ED 66. I used the L-Enhance filter again which does a great job of controlling stars while letting emission nebulas shine. Unfortunately it does mute reflection nebula, so it isn’t a one-size-fits  all filter.

Here we go – the Flaming Star and Tadpole nebulas, unfortunately the tadpoles are almost invisible:

 

Flaming and Tadpole
Flaming Star and Tadpole Nebulas

 

And the Flame and Horsehead Nebulas.

Flame and Horsehead
Flame and Horsehead Nebulas

Mercury in the morning

Couldn’t sleep.

Compensation was clear skies at dawn from the window-sill.

Sony DSC-HX60

Inset with 80mm f/5 refractor + X2 barlow + PD camera,

A bit later-

Later:

Now had chance to look at the image sequence I took to investigate the “fake” Arcturus.

Here is one acquired 2 minutes earlier with Mercury still clear of the trees (and with a slightly different exposure)  that I have left uncropped to show the “real” Arcturus. No sign of the fake one!

Spacing between Sky Watcher reducer Corrector-0.85x/ED80 and QHY10

The only post I can find in this subject in internet is on Cloudy Nights forum and the author stated that he achieved excellent focus with spacing 56.2mm. I have added in 5mm T2 spacer between the filter wheel and camera to achieved 36-37mm between camera and field flattener. The camera adds 20mm between sensor and end of flange so this makes total of 56-57mm, which should therefore be ideal. I will find out when I next have a chance to use it at night!

Andy

Changing field flattener on Equinox Pro 80mm OTA from Tele Vue TRF-2008 field flattener to dedicated Sky Watcher Reducer Corrector-0.85x/for ED80

I’ve changed focal reducer for the dedicated Sky Watcher one – it came up on AB&S second hand. Reason for doing this is that the Equinox had great difficulty gripping the Tele Vue TRF-2008 field flattener and it kept slipping – this isn’t problem with TRF but rather with this particular combination. New field flattener grips tightly and daytime tests suggest comes to focus but I don’t have far enough away tree to know for sure whether enough back focus so I will find out next clear night……if not enough back focus then I will need to cope with TRF which will focus. Mind you this is the dedicated SW one so it should work!

I have connected the field flattener to the telescope using a bespoke 2″ nosepiece purchased from First Light Optics. I think the end of the focuser tube might unscrew to allow direct connection by screw thread of flattener to scope but I can’t get it to budge and I am worried that I might damage the scope if I try harder to get end off the draw tube on the focuser.

Andy

Stacked Nebulosity Files from my favourite astrophotos to date 24/11/2019

Click on link below to download ZIP folders of stacked Nebulosity Files from my favourite astrophotos to date 24/11/2019.

Andy

Heart Nebula 181119 Nebulosity Stacked File (ZIP Folder)

M81 & M82 181119 Nebulosity Stacked File (ZIP Folder)

M101 290919 Nebulosity Stacked File (ZIP Folder)

NGC6960 Witches Broom 161019 Nebulosity Stacked File (ZIP Folder)

NGC7000 190919 Nebulosity Stacked File (ZIP Folder)