Orion Premium Linear Binoviewer

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.


Orion Premium Linear Binoviewer

My best purchase from the Practical Astronomy Show. These binoviewers differ from other makes in that they do not require any extra in-focus. You never see these on sale….but this one was around £100 off new price! I have tried binoviewers before but the need to use a Barlow lens in order to obtain focus on my Newtonian telescopes has meant that they weren’t very practical. I decent read a review in one of the astronomy magazine about this binoviewers and the reviewer was so impressed he bought one!

I tried it today on my Orion 10″ Dobsonian telescope. In order to get focus, I had to use an extension tube plus my Tele Vue Paracorr – the latter has a long tube and I can pull it out quite a distance to act as an extension tube. All of this suggests that I will easily obtain focus on the night sky.

At the Practical Astronomy Show I purchased a pair of discounted APM ultra flat field 18mm 65 AFOV eyepiece and I already had a pair on Tele Vue Nagler 7mm eyepiece.

The view of the trees at the bottom of the garden was amazing! This the first time I have ever had a proper binocular view through a telescope without any sense of strain on my eyes! Both pairs of eyepiece worked well. I can’t wait to get out under the night sky. Only problem is this could work out really expensive on eyepiece with my having to buy a second one to accompany some of those I already have…..



Always worth having a bag of eyepiece caps so if you see any being sold cheap I recommend you purchase some spares in 1.25 inch and 2 inch varieties for both ends of the eyepiece. Below is my bag – the cheap 18mm eyepiece did not come with caps so good job I had some spare.

The attachments I used to obtain focus – this was opposite of in focus = out focus – as I was focusing on the trees at the bottom of my garden which are closer than infinity.

The Tele Vue Paracorr is one of my best ever purchases – so useful!