***Read the review of the Stellarvue Optimus eyepieces by Tony Hallas in the May 2017 issue of Astronomy***
Introducing the Stellarvue Optimus eyepiece series. This 20 mm eyepiece is ideal for viewing of extended objects, scanning the Milky Way and locating objects using the widest possible field of view.
A 100 degree field of view provides the user with almost 1.5 times the area of an 82 degree eyepiece. When using hand driven alt-azimuth mounts this generous field will be appreciated. The eyepiece offers a generous 15 mm of eye relief and has a standard foldable rubber eye cup. Each of the nine elements are fully multi-coated, edge blackened and the lens barrel and baffles are similarly dark black. All of these factors add up to create an extremely contrasty eyepiece that is free of unwanted reflections, flaring or ghosting.
Our EOP eyepieces are now loaded into AstronomyTools database and application. Click here to simulate the field of view https://astronomy.tools/
|20 mm Stellarvue Optimus Specifications|
|Focal Length||Weight||Length*||Max. Dia.||Lenses**||FOV***||Eye Relief||Barrel(s)||Field Stop Dia.|
|20 mm||29 Oz||6"||2 5/8"||9/6||100||15 mm||2"||34.9 mm|
|*Measured with eye cup rolled down. Add 1/8" if rolled up.|
|**Number of elements/number of groups|
|***Apparent Field of View measured in degrees|
9 Reviews Hide Reviews Show Reviews
I've been using this eyepiece in a 10" dob w/ focal length of 1250mm for a few weeks now, and it has been outstanding. I used it to upgrade away from a 2" 30mm plossl, and it has been worth every penny. While the plossl has a decent viewing area for its level of magnification, the Stellarvue 20MM Optimus gives me a slight increase in magnification and a much wider area to view when studying the stars and other celestial objects in the sky. Star clusters and nebulae are very clear on clear nights (the views of M35 and M42 are both very vivid in this eyepiece) , and with this wide viewing area I can observe for longer before having to realign the scope as the the sky moves. I will probably get something a little higher magnification for strict planetary viewing, but as a 'swiss army knife' eyepiece that can be used to do a lot of things the 20mm seems to be it for my scope. Well worth the cost.
Wonderful eyepiece with my 90mm Raptor.
Used it on my 90 mm Raptor. Great combo.
Best view ever out of my SV 102 T Apo refractor. Very easy to look through and very bright and sharp right to the edge. Definitely easier to look through than the Teleview Ethos 21mm that I have tested in the past.
I really enjoy this eyepiece. It feels like I’m inserted in space when using it with my scopes. Very sharp stars to the edge and such a great FOV to experience.
I wanted an eyepiece in this focal range for my Stellarvue SVX125D and I'm very happy with this purchase. The crispness of the image across the entire field of view is just remarkable. When I set my telescope up for observing, this is the first eyepiece I insert. Every bit as well made as the 6mm Delos and 35mm Panoptic that I also use. Another great value by the Stellarvue team!
I needed an eyepiece in this focal range for my Stellarvue scopes, an SCT and a 16" dob. I had a chance to evaluate an Ethos 20 and a Nagler 22 and I decided to go with the Optimus 20mm. The Optimus was wonderful in the dob, excellent in the SCT and is the main go to eyepiece in my SV130ED. I've used it for about 5 months. The fit and finish seem to be on par with my Ethos 13.I am very happy with the purchase and would do it again.
It's now the first eyepiece I pop in when observing. To be honest it I had to do it all over again, I would have purchased these instead of my Naglers. Don't get me wrong, the Naglers are fine but I love the 100 - 110 apparent fov. These are great for sketching at the eyepiece.
I used the 20mm with my 14-inch dob for the All Arizona Messier Marathon and most of the Astronomical League's Sketching Program. What a beautiful image. Best low-power eyepiece I have in my case. All the rest are Ethos.