Tele Vue 3X Barlow for 1.25" eyepieces

$127.01

Availability: More on the way

If you need a high quality, medium high power Barlow for 1.25" eyepieces, look no further than this TeleVue. It's a 2-lens achromatic design with superb sharpness to match that of TeleVue eyepieces. It is fully multicoated, with blackened lens edges and internal antireflection threading for excellent contrast. Its barrel is threaded for standard 1.25" filters. There's an undercut safety groove in . . .
Our Product #: 7630
TeleVue Product #: BLW-3125
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Product Description

If you need a high quality, medium high power Barlow for 1.25" eyepieces, look no further than this TeleVue. It's a 2-lens achromatic design with superb sharpness to match that of TeleVue eyepieces. It is fully multicoated, with blackened lens edges and internal antireflection threading for excellent contrast. Its barrel is threaded for standard 1.25" filters. There's an undercut safety groove in the barrel that helps hold the Barlow in place should the focuser thumbscrew accidentally loosen. A non-marring brass clamp ring holds eyepieces securely in place. A captive thumbscrew (that can't be lost in the field) controls the clamp ring tension.

Its 5" length is marginal for use in star diagonals, however, as its length (combined with a physically long eyepiece) can put your eye nearly 7" above the diagonal when observing. This poses no optical problems, but some inexpensive diagonals have rather loose tolerances. The weight of the very long Barlow/eyepiece combination may cause the diagonal housing to loosen where it fits into the visual back and pivot unexpectedly.

This TeleVue 3x is parfocal with TeleVue Plössls below 32mm in focal length, so you won't have to do any major refocusing as you change from an eyepiece alone to an eyepiece/Barlow combination. It is optically corrected down to f/4 for use with fast f/ratio reflectors, but will provide excellent performance with any scope type. Due to the length of the Barlow, the accessory container recommended below is substantially larger in diameter than is needed for a snug side-to-side fit, even though the container length is correct to hold the Barlow without rattling.

Tech Details

Barrel Size 1.25"
Length 5"
Number of optical elements 2
Power 3
Weight 7 oz
Warranty 5 years

Reviews

Review by:
I decide to buy this barlow because I had bad experience with planetary images using a shortly barlow of another brand , so after reading a lot of reviews, I decided to buy Tele Vue 3X, it was night and day

I highly recommend (Posted on 7/22/2019)
Review by:
A great match for my TV-76, TV-85 and AT115 for planetary imaging. I use an extension tube with it on nights of exceptional seeing for 4x magnification. (Posted on 12/31/2018)
Review by:
I use this barlow on both my TV-76, TV-85 and my AT115edt for planetary imaging with an ASI 395 camera. On most nights, 3x offers the correct magnification for the seeing. On the best nights, I use an extension tube to take the 3x to 4x. (Posted on 12/31/2018)
Review by:
i use this barlow with at TV76 refractor, and before that with a TV Ranger refractor.
I thought the length would make it awkward to use, but i was wrong. (Posted on 10/7/2018)
Review by:
This is a great barlow. It has oustanding construction and optical performance. I found it excellent for lunar observations and deep sky observations. One marke of the quality of this barlow is that it does not introduce new aberrations into the eyepiece. Instead it cleans up edge performance and maintains sharp views. One nice feature of this barlow is that the lense can be unthreaded to make cleaning easier. However, the threads do not match standard threads so you won't be able to attach it directly to an eyepiece. (Posted on 8/4/2017)
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