Stereo Binocular Viewer for Telescopes - Featuring an Adapted 1.25" Barrel and Two 32mm Plossl Eyepieces - Almost 3D Observing with Both Eyes and Enhance The Image Contrast

I purchased these and the CELESTRON model and inevitably chose the more expensive CELESTRON ones but only because I love the brand and they were a bit higher quality. This brand was just about the same and I’m sure would do the same thing… but I did not receive any eyepiece like they advertised and they just seemed a little less solid to me. But if you’re tight on money then these are good. Also just for reference… they do not seem to work with any eye piece angles or on Reflector scopes…. I may be wrong though and just not have figured out how yet but thought it worth sharing.

Tested with F5 achromatic refractor. Not the ideal telescope. Very good image of the moon although it did not focus directly, if it did with both barlow lenses included. Saturn although small, its characteristic is noted. It was also tested with svbony 17mm plossl eyepieces. At the moment with this F5 telescope, I don't think it's necessary to try more lens combinations.UpdatedAfter more than a year, I will explain according to my opinion why they are not for everyone.Sometimes I have not been able to emerge the image. But more than once I have achieved more than 240x on the moon. They have worked well on planets and some nebulae and open clusters. Sometimes small objects do not emerge but large ones do. They improve contrast at the expense of less light, although in general the image is more relaxed with both eyes. That is why I have purchased several sets of eyepieces that work very well on them and are not extremely expensive.svbony40 plossl25 plossl15 red line10 flat field " does not have a slot".These pieces can be unscrewed from the barrel and inverted. Then the slot would be at the bottom.Another high quality item was the oca 2x from William Optics which is sold by Agena. This provides better image quality than the 1.85 of the binoviewrs.Why give them more than one chance if the image doesn't emerge the first time?If you have not rested well even though you feel well, the image may not emerge.Do not drink alcoholic beverages before or during use. It is an excellent test to verify that you are no longer well even if you feel wonderful.If you take any medication, make sure it does not interfere in any way with your alertness. Even if you feel fine, it will probably cause problems for the image to emerge.The first time, I recommend trying during the day with some large and one small distant object. Also try starting to focus without adjusting the eyepieces and then adjust gently.At the moment all the named combinations work, some if not others, with these telescopes. In a refractor it is ideal to have, if applicable, 1.25 and 2 diagonal to be able to focus certain combinations.120mm f5 refractor105mm f13 mak90mm f5.5 refractor200mm f6 dobsonianBut if you want to keep it simple, I only recommend as an improvement, the oca from William Optics.

I really wanted to get a cheaper binoviewer than the really expensive ones I had gotten years ago and had to give up for its terrible (too long light path) 9 inches! I could not get them to work on my newtonian as they were just too bulky and offsetting for the telescope. At least I could get them to focus into one image just as I can easily get binoculars to focus into one image. NOT THESE binviewers however.. I even tried 3 (I really wanted to have them succeed so much) and everyone had this same imaging problem. I and others who tried them out said these just would NOT image into one image such being a make or break for its performance. I had to send them back and got a warning from amazon on too much return of product....Just to say I won't be doing this again.

It seems that the manufacturer designed the included eyepieces to provide more in-focus than other eyepieces in order to compensate for the added length of the binoviewer. However, they then added a 3x nosepiece Barlow that requires more back-focus and a 1.85x that requires even more in-focus. If you have a telescope with a short main tube or a Borg with sectional tube, it may be possible to use 1x, 1.85x, and 3x (or the equivalent of using 30mm, 16mm, and 10mm eyepieces), but having to shorten and lengthen the main tube as needed. In the case of my refractor, I was able to shorten it to use 1x, lengthen for 3x, but not shorten it enough to use 1.85x. No other eyepieces would work in the 1x configuration, and at 3x, I had to switch from a 2" to 1.25" diagonal to reduce the light path and some eyepieces still could not reach focus.The images produced by the optics are excellent. But reconfiguring the telescope with threaded spacers every time I want to change power is a lot of work that kills the enjoyment. I bought a linear binoviewer to test alongside and changing power is a matter of swapping eyepieces, and it works with all my telescopes. It cost more, but it was worth it for the convenience and versatility. Also, if I purchase additional eyepieces, I do not need to worry about whether they will come to focus.Also, way too much liquidy lube applied to the focus/clamping mechanism.

I used this for white light solar observing and it has passed amazingly. Very sharp!My unit came with scratches on the body hinge cover and upper eyepiece clamps but hearing about some other issues on these I am so far going to keep it. Perfect clean optics and mechanical is smooth. Eyepiece holders hold secure and eyepieces can be changed out. Hoping my 3D ones work. IPD distance is high. I read minimum is 55 to 60. Mine is around 62 and I can just merge the images. Any wider and I could not use it. I like the compactness and weight of the unit is the best I've used. Very happy with the unit and a bargan over other models by far. I really believe we are getting a deal on these because of assembly cosmetic second but they cannot be easy to assemble which is probably an understatement. Well done. Everyone should have one.Edit: returned and purchased another that is near perfect fit and finish. Very surprising to see clean views in these.High mag is better in better viewer, to be sure but amazing for price.

Hard to find. Great product