Orion Optics 10″ Dobsonian Telescope

Photos through Cheshire sight tube and Catseye collimators after Lee has collimated Orion 10″ Dobsonian telescope

The photos below are through my Cheshire colliminating eyepiece sight tube and through Catseye collimators today – latter are 2 x 2″ collimators, one of which at least is a Blackcat collimator. Lee collimated the scope for me on Friday night and I thought it would be useful to keep a record of what the reflections seen through the sight tube should look like when the scope is properly collimated, to help me with my own attempts at collimation in the future.

The wrinkly edge at one side of view is the top of my sofa!

This post follows from the previous one regarding Lee’s collimation on Friday night:

Lee collimates my Orion UK 10″ Dobsonian Telescope


View through Cheshire sight tube:

View through Catseye collimators:

Lee collimates my Orion UK 10″ Dobsonian Telescope

I really need to learn how to collimate my telescopes well – I had today off work and spent several hours attempting to collimate the 10″ Orion UK Dobsonian Telescope…..but Lee demonstrated how much better it could be done.



View down Cheshire eyepiece sight tube after Lee collimated the telescope:

See also the following post which has better photos of view through the Cheshire post collimation today:

Photos through Cheshire sight tube after Lee has collimated Orion 10″ Dobsonian telescope

First light Orion Premium Linear Binoviewer with Orion UK Dobsonian 10 in telescope 20/3/19

First light last night with my new Orion Premium Linear Binoviewer used on my Orion 10 inch Dobsonian telescope. What excited me about his binoviewer when I got it was that it claimed not to need any in focus – an issue that has meant other binoviewers I have tried only work if a Barlow lens is also used which means they only work at high magnifications. The whole point (in my view) of using Dobsonian telescopes are the immersive wide angle views – and you need the wide angle at least initially with an object to find it in a Dob when you are star hopping!

Great news! The Orion (USA) Premium Linear Binoviewer does come to focus in my Orion UK (different company) 10 inch Dobsonian. In fact I needed to use a 35mm extension tube – although that is common too with eyepieces in this scope so does not imply that the binoviewer increases out focus. So I think the manufacturer’s claim that no extra in focus is required seems to be supported on this test.

I had more of a problem bringing images of the Moon and a couple of stars together with my two eyes in the binoviewer – I put this down to lack of experience. There were times when the Moon images did come together and then suddenly the Moon would be significantly brighter.

Mind you, I am being a bit unfair on the binoviewer here. Due to the Moon being located awkwardly behind a tree, I had to place the scope in an awkward position to get a view and my own body was somewhat awkwardly positioned too – so that it wasn’t easy to view properly through the binoviewer.


Adding Sky Watcher finder scope style mounting shoes to Orion UK 10″ Dobsonian telescope

My trusty and well used Orion 10″ Dobsonian telescope does not have Sky Watcher style finder scope shoes – a nuisance as I would like to use a finder scope with it and also attach my heated laser finder device which has Sky Watcher style finder bracket.

So today out came the glue gun and I attached two finder shoes to the tube. If the glue gun turns off with time not to be strong enough then I will bolt them on but hopefully this won’t be needed as not much weight on them.

The other advantage of using the glue gun initially is that I can change position of the finder shoes if it turns out they are not in the best place in practice.


I chose a rather cold day to do this!

OK so in the next picture it looks a mess. However, once the glue has cooled I will then be able to tidy it up and I would rather put a bit more glue on so that my stuff does not fall off the scope, including my bargain from the Practical Astronomy Show – right angled 9×50 finder scope with illuminated eyepiece for only £45, which I bought especially to put on this scope!


Purchase from Astrofest – Orion UK eyepiece tray

I have just installed a great £20 Accessory I purchased at European Astrofest 2019 – an aluminium eyepiece tray to compliment my aluminium Dobsonian mount base on my Orion UK 10″ Dobsonian telescope. Hitherto, I have been putting eyepieces on base below the scope with risk they fall off if I forget they are there and pick up mount to put it away at end of observing session. This new arrangement is much safer! I have drilled extra holes to install at front but there are also already holes available to install it both sides instead so I will see which I prefer in practice.


See also:

European Astrofest Day 1 – 8/2/2019

Astrofest 2019 Day 2 – 9/2/2019

Video from European Astrofest 8-9 February 2019

Observing Log 2/2/2019 @ 18:45-3/2/2019 @ 03:30. Damian and Andrew. Photos taken through the eyepiece

All following photos are through the eyepiece, mostly of the Orion Dobsonian telescope used during this session, but a few from the Tek 140 scope. Photos include photos through Explore Scientific or Ethos eyepieces, and through our homemade image intensified eyepiece on the Orion.

All photos were taken using Samsung S7 smartphone hand held next to the eyepiece.


Hubble Variable Nebula: The following two photos were taken through the image intensified eyepiece on the 10″ Orion Dobsonian Telescope:

M42 Great Orion Nebula: Image intensified eyepiece:

M42 Great Orion Nebula: Explore Scientific 20mm eyepiece on Orion Dobsonian:

Crab Nebula:


Double Cluster in Perseus: Image intensifier:

Double Cluster in Perseus: Explore Scientific Eyepiece:

M82 in Ursa Major: Image Intensifier:

M81 in Ursa Major: Image Intensifier:

The Eyes Galaxies at the end of Markarian’s Chain: Image Intensified Eyepiece:

M13 in Hercules: Image Intensifier: