Explore Scientific 34mm 68° field argon-purged waterproof 2" eyepiece


Availability: More on the way

This Explore Scientific 34mm argon-purged 2" is a big eyepiece - big in size, big in weight, big in field of view, big in performance. It gives you impressively sharp high contrast images with virtually any telescope with a focal ratio of f/5 and above that uses 2" eyepieces.
Our Product #: ES6834A
Explore Scientific Product #: EPWP6834-01
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Product Description

This new 68° 34mm Explore Scientific is a high-quality and physically-impressive low power wide field 2" eyepiece for the serious deep space explorer. It comes with an unusual benefit. It is O-ring sealed and argon-purged to be 100% waterproof. This prevents internal fogging in the eyepiece; keeps the interior dust-and fungus-free; and makes it easier to clean, as there is no risk of excess cleaning solution getting trapped between the lenses.

Many observers feel that a 68° field eyepiece like this Explore Scientific hits the "sweet spot" between the affordable, but "looking down a tube" view of conventional 45°-50° field eyepieces, and the full-immersion, but very expensive, observing experience of an ultra-wide field 82° or 100° eyepiece.

The 2" 34mm Explore Scientific is ideal for observing galaxy clusters, large emission and reflection nebulas, and nebula remnants. - no matter what your telescope type, as long as your telescope has a focal ratio of f/5 and longer. A shorter focal ratio will waste some of your scope's light gathering capacity when used with the 34mm Explore Scientific.

For example, an f/4.5 Dobsonian reflector will have a huge 7.55mm exit pupil with this 34mm eyepiece, a larger light cone than your eye can probably dilate to accept. Some of the scope's light will therefore fall on your iris instead of entering your eye, wasting the light. If your scope's focal ratio is f/5 or above, however, this 34mm Explore Scientific can give you some truly excellent "big picture" views of deep space. You can use the calculator in the "formula" tab above to see just how wide the field will be with your particular scope.

With a huge 26mm of usable eye relief, the six lens/fully multicoated 34mm Explore Scientific can be used by eyeglass wearers with no vignetting of the field. The eyepiece has a soft fold-down rubber eyecup and comes with dust covers for both ends of the eyepiece.

This individually serial numbered Explore Scientific eyepiece is backed by a limited one year warranty, which will be extended to an Explore Scientific transferable lifetime limited warranty when its warranty card is registered with Explore Scientific within 60 days of purchase. Here's a link to the full details on this unique transferable lifetime warranty.

Tech Details

Barrel Size 2"
Eye Relief 26mm
Field of view 68
Focal Length 34mm
Number of optical elements 6
Weight 24 oz.
Warranty 1 year, extendable to lifetime


Review by:
I have owned the ES 34mm 68 deg for several years now and use it primarily as a low power eyepiece with my 12.5” f/5 Newtonian. It serves in this role admirably, offering bright images with minimal edge distortion, even without the use of a coma corrector. Quite heavy, so it will require appropriate counterbalancing with some scopes. Highly recommended. (Posted on 10/28/2019)
Review by:
I love Explore Scientific's eyepieces. They perform great and present an absolute value. While I don't own any TV Panoptics (their 68 degree series) I have still looked through several in viewing sessions and can say I don't think the Explore Scientific eyepieces give up a thing against their competitors. That's why all my EP's are Explore Scientific. (Posted on 10/22/2019)
Review by:
I have been using this eyepiece for over 2 years now. My primary scope is a David Levy Comet Hunter and the ES 34 pairs nicely for very clear wide field views. No issues at all with this eyepiece, my views are tack sharp all the way to the edge. The eyepieces from ES, I have a bunch of them, still look and perform like new, they are high quality for a reasonable costs. (Posted on 10/4/2019)
Review by:
I had the Meade SWA version of this eyepiece, sold it and missed it so much I got one of these. Less expensive EPs that have similar FL and FOV didn't cut it and more expensive ones weren't enough better to justify their price. There is some minor field curvature vs. the similar Panoptic but overall I find this EP a little easier to use and much better value. (Posted on 7/22/2019)
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