All photos by Alan Dyer.

You watching: Explore scientific 100 degree eyepiece review

Note: For meanings of basic eyeitem qualities discussed listed below, watch Ed Ting’s A Beginner’s Guide to Telescope Eyepieces.

Eyepieces through 100° evident areas of check out carry out the widest actual areas possible at any offered focal size (via the exception of the few 110° and 120° models on offer). The area is so wide it deserve to be tough to check out the edge of the field. But then aacquire, that’s more or less the point — the eyepiece gets out of the means so you no longer have the sense you are looking with a round porthole or home window.

I tested a number of eyepieces advertised as having 100° fields, all with focal lengths from 13mm to 15mm, a great “sweet spot” for any type of eyepiece on the majority of telescopes, and also encompassing the focal size of the original 13mm Nagler and Ethos models from Tele Vue. Make no mistake, these are huge and heavy eyepieces, through some requiring 2-inch focindividuals. I tested these on f/6 apo refractors and f/5 to f/6 Newtonian reflectors, concentrating on comparing on-axis and off-axis sharpness. I present them in order of boosting price.

For a lighter, lower-cost different, and for 1.25-inch focindividuals, you could wish to think about an 82° eyeitem.

My conclusion upon trial and error this 100° group was that performance was more or less commensurate via price. The Meade and Omegon represent great values. Though more costly, the Stellarvue Optimus likewise stood out for price vs. performance in a complete 100° eyeitem. The Explore Scientific 100° came exceptionally close to corresponding the top-class Tele Vue Ethos, however at a lower, though still premium price. But the original Ethos continues to be unequaled for optics.

Omegon Panorama2 15mm


MSRP $270

Pros: Very great optical performance and also construction; lengthy eye relief.

Cons: Less than 100° obvious field.

Omegon in Germany supplies many kind of unique commodities such as their Panorama2 eyepieces. While low expense for a 100° eyeitem, take into consideration import fees if ordering from Europe. I ordered mine from Omegon and also overseas delivery was prompt. Performance is great, via stars sharp throughout all however the external 10 percent of the field. Eye relief is a really lengthy 20mm. However before, the Omegon and Meade both have actually obvious areas closer to 90° as I measured it. While still superior, they aren’t as wide as the others. The Omegon’s weight is 600 grams, at the reduced end of the array for eyepieces in this group.

Bottom Line: A excellent ultra-wide eyepiece for the money.

Meade MWA 15mm


MSRP $270

Pros: Very excellent optical performance and also construction; long eye relief.

Cons: Less than 100° area.

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Like twins separated at birth, Meade’s MWA (Mega Wide Angle) looks practically identical to the Omegon Panorama2. Optical performance is also the same and excellent for the money. The knurled grip rings and construction of both are superb. Either model represents a wonderful worth in a mega-wide eyeitem. Note the Meade’s middle-weight 638 gram mass and also that both the Meade and Omegon are just for 2-inch foccustomers, requiring even more costly 2-inch filters.

Bottom Line: Another fine ultra-wide eyeitem for the money.

Stellarvue Optimus 13.5mm


MSRP $350

Pros: Lightest 100° via excellent eye relief.

Cons: Slightly soft off-axis performance.

At 564 grams even via its 2-inch adapter tube, Stellarvue’s Optimus is the lightest of the 100° set, a consideration for balancing smaller telescopes. Like the Ethos, it deserve to be used as either a 2-inch or 1.25-inch eyeitem. Stars start to distort in the external 25 percent of the field, so worse than the Explore Scientific and also Tele Vue Ethos, but still exceptionally great, particularly for the price. Eye relief is a comfortable 13mm and there’s no annoying kidney-bean shadowing of the departure pupil, true of the others in this group.

Bottom Line: Very good performance vs. price.

Explore Scientific 100° Series 14mm


MSRP $550

Pros:  Superb star imeras.

Cons:  Heavy and 2-inch only; shorter eye relief.

The Explore 100° comes an extremely cshed second to Tele Vue in sharpness, through stars sharp across 90 percent of the field and also still well included at the edge. At a measured 13mm, eye relief appears a tiny tight, and also 1.5mm much less than stated, due to the eye lens being even more deeply recessed than in the others. But viewing with glasses on is still feasible. The primary drawearlier is the substantial 833 gram weight, by far the greatest of the 100s. And it is simply for 2-inch foccustomers and so calls for 2-inch filters. But it is a wonderful eyeitem, for $80 much less than the Tele Vue Ethos. It comes with a vinyl storage bag and the eyepiece is totally waterproof — it deserve to also be submerged for cleaning!

Bottom Line: Near-Ethos photo high quality for less money.

Tele Vue Ethos 13mm


MSRP $630

Pros:  Best eye relief and also off-axis star imperiods.

Cons:  Highest price.

This is the original 100° eyepiece and also is still the typical of excellence. Eye relief is 15mm, a small much longer than the Explore and also Stellarvue rivals. And stars are tack sharp throughout 95 percent of the field, flaring just slightly at the extremely edge. It performs well on faster telescopes, a key characteristic of Nagler and Ethos eyepieces. Regardless of its dimension and dual barrel, its mass is just 586 grams, less than some of the rivals. But the price is the highest possible. Though if you desire the ideal, this is it.