Name: Tele Vue 3.7mm Ethos-SX 1.25" with 2" Eyepiece Adapter
Brand: Tele Vue
SKU: TV37ESX
Price: 693.00 USD
Availability: BackOrder
Rating: 5 (8 reviews)

Tele Vue 3.7mm Ethos-SX 1.25" with 2" Eyepiece Adapter

Tele Vue Ethos

Tele Vue

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Order now, your card will not be charged until it is ready to ship. Estimated to Ship: 09/2025.

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Optics & Binoculars

Telescopes & Astronomy

Telescope Eyepieces

Tele Vue Telescope Eyepieces

Tele Vue Ethos 

Explore the Tele Vue 3.7mm Ethos-SX eyepiece. Boasts 110° field of view, 15mm eye relief, and 2"/1.25" barrel. Shop now for superior optics!

With 110 deg., the Ethos-SX has 21% more AFOV area than the 100 deg. Ethos design. This permits 62% power increase from a 6mm Ethos, while retaining 68% of its TFOV. The 3.7mm actually has more TFOV than Tele Vue's 8mm Plossl, 6mm Radian and 5mm Nagler Type-6! In 1-1/4" mode, it is parfocal with the wide range of 1-1/4" Tele Vue Plossls, Panoptics, Radians, Naglers, Nagler Zooms and 6mm and 8mm Ethos eyepieces. The screw-on 2" adapter (included) is designed to make it parfocal with 13mm and 10mm Ethos when they are used in their 2" modes.

Very easy and smooth ordering process. Came very quickly, even with covid. The eye piece it did the ip's is great regarding the eye relief. Would highly recommend this piece.

Great eyepiece for your collection

Oh wow!!! It’s so wide I can still use it to do the alignments. But yes views are beautiful.

Outstanding!

The wide angle lets you see the moon close up and fits the entire moon in the viewer.  It's my go to lense for showing objects in the sky.

It's my go to lense for showing objects in the sky.

Scanning starfields across Milky Way yields gazillions of pinpoints of starlight!

Serves up clusters, nebulae galore!

Observing Saturn yields planetary banding, and gap between planet and rings!

Pros:  great brightness, contrast and resolution

Cons:  pricey...

Best binoview ever in Oberwerk BT-100/45

I use it with permanent f/4.5 29-inch Dob, Paracorr and Dioptrx. That's a lot of glass! The field is SO wide that although can see it all looking straight in, must move head to concentrate on edges. Measured throughputs in photometric labs: R=94.7%, G=93.7%, B=91.7% attest to great MARC coatings throughout. Wonderful on remote galaxies. Get one 13mm for your favorite higher mag - full set would be overkill. Use Naglers for other EFLs. Best on fast Dobs, overkill on slow scopes. Buffalo club visited and were all +++ impressed.

Amazing - almost TOO good!

I have used this 6mm eyepiece coupled with a small barlow on a TV-85 to get wonderfully close, sharp views of the moon, planets and other deep sky objects. As with other Ethos pieces, the field of view gives a whole new meaning to the phrase "space walk" - you get the feeling you're looking out a space craft. [...]

More Ethos magic from Tele Vue!

This is great in both my TV 85 and 4" Genesis.  Yes, it is a little expensive but the stunning views will make you forget.  Sell a few of your other eyepieces to afford it if you have to.  You'll be glad you did.

EXCELLENT- best view and contrast!!

I have had the most stunning views of the Moon that I have EVER seen through this eyepiece.  The Veil Nebula (with an O-III filter) was breathtaking!  I am getting rid of other eyepieces because this is mostly what I use now.

Tele Vue 3.7mm Ethos-SX 1.25" with 2" Eyepiece Adapter

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