2X Barlow for 1.25" eyepieces

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The 1.25" 2x Explore Scientific premium Barlow (described by Explore Scientific as a focal extender, rather than a Barlow) uses an advanced four-element optical design to deliver a flatter field of view with sharper field edges than even the best three-element apochromatic Barlows.

This Explore Scientific focal extender doubles the power of any 1.25”eyepieces used with it, providing high powers while maintaining thecomfortable eye relief of longer focal length eyepieces. This makes aBarlow/long focal length eyepiece combination ideal for those who must wear eyeglasses while observing due to astigmatism.

All air-to-glass surfaces are fully coated with multiple layers of individually tuned ion-deposited anti-reflection materials for maximum light transmission and contrast. The lens edges and all internal metal surfaces are blackened to maximize the image contrast. Your eyepieces are held in place by a non-marring clamp ring that won’t scratch your eyepieces as a conventional metal thumbscrew can.

While not specifically claimed to be apochromatic in performance, color fringing in this Explore Scientific focal extender is essentially eliminated with all telescope types and focal ratios.

This Explore Scientific focal extender is protected by a one year warranty that can be extended to a transferable limited product lifetime warranty at no cost by simply sending in the warranty card. With the extended product lifetime warranty, this Explore Scientific focal extender is protected for as long as it continues to be manufactured, plus an additional five years.

Power:
2x
Barrel Size:
The industry standard diameter, as of 2011, is 1.25" and is the most common.  Other sizes available are .965" and 2".
1.25""
Warranty:
1 year, extendable to lifetime
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1. David on 3/6/2013, said: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics
The 1.25" 2x Explore Scientific barlow is a 4-element design that performs like a telecentric barlow. The construction of this barlow is outstanding and I was very pleased with the large set-screw for locking eyepieces with the compression ring as it makes it easy to lock the eyepiece with gloves on. Optically the performance of this barlow is outstanding. I've used it with a 20mm XW, Silvertop plossls, Sterling plossls, and AT Paradigm eyepieces. In all of these eyepieces the 2x ES barlow has outstanding performance. Edge performance is cleaned up and the field is very flat with this barlow. I have found it performs extremely well for both deep sky and lunar observations and have not tried it for planetary observations yet. As with any telecentric barlow the 2x ES barlow maintains the eye relief and exit pupil characteristics of the eyepiece so it does not introduce problems with blackouts and I have not seen any vignetting when using it either.
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Explore Scientific - 2X Barlow for 1.25" eyepieces

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Explore Scientific - 2X Barlow for 1.25" eyepieces
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 AstronomicsAstronomicsAstronomicsAstronomicsAstronomics (Average: 5.00 | Users: 1)  Only registered users can submit ratings - Register Here
Our Product #: ESB1X2
Manufacturer Product #: FE02-125
Price: $99.99  Ground shipping for this item is $8.95 - Click for more info
By adding 1 of these items to your cart your order total will be less than $100, and will ship within the 48 contiguous United States for $8.95. Add $0.01 to your order, however, and you qualify for free ground shipping (heavy items with fixed shipping, such as counterweights, excluded).
MSRP: $222.99
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This new four-element 1.25" 2x Explore Scientific focal extender (Barlow lens) has an exceptionally flat field and essentially no color fringing with all telescope types and focal ratios . . .





. . . our 34th year