Product Description
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
I highly recommend (Posted on 7/22/2019)
I thought the length would make it awkward to use, but i was wrong. (Posted on 10/7/2018)