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Condición: nuevo
Marca: Datyson
Material: metal
Color: negro + plata
Tamaño (L * Dia): Aprox.84 * 41 mm/3.3 * 1.6 pulgadas
Interfaz: 1.25in
Diámetro del ocular: 20 mm
Longitud focal: 8-24 mm
Campo de visión: 40 a 66 grados
Alivio de los ojos: 15 a 18 milímetros
Revestimiento de lente: película verde de banda ancha
Peso aproximado.168 g
Lista de embalaje:
1 * ocular
MBL
Comentado en los Estados Unidos el 7 de febrero de 2023
Several of us over at the CloudyNights forum purchased this eyepiece because at the time it was so cheap we figured, why not? I paid $6.99 for mine, others paid less. Whether it was worth $6.99 is subjective, but it wasn’t worth that to me.It's made of good materials, and the machine work is impressive in places. Until I disassembled, lubed, reassembled, and worked it in, the zoom mechanism was exceedingly poor in that it was rough, inconsistent in movement, catchy, and crunchy. I attribute this to a poor choice of surface finish that created excessive mechanical friction. It seems likely to me that a smoother finish would have improved the mechanics significantly.Once smoothed down with repeated movement the zoom mechanism has become decent. I'd say it went from a 1 out of 10 to a 6 out of 10 as far as mechanics go. I hope some day it will improve to a 7 out of 10, but then I'm a great optimist.Optically, it possesses what I can only describe as a cornucopia of optical defects. I'm a beginner, and while I've read with great interest about spherical, coma, astigmatism, field curvature, scatter, and many other optical errors, to my untrained eyes and in my poor seeing environment these were almost entirely academic; in other words, I understood what the terms meant, but hadn't yet experienced them. Well, I can now say my eye has been opened and I've experienced them all, with this one eyepiece.I can now have another inexperienced viewer look through the eyepiece, ask them if they notice defect A, B, C, or D, and I can be pretty confident they'll easily see what I'm trying to show them. So as a learning tool, thumbs up!So, should you get one? If you're curious, have some free time, like tinkering, especially enjoy improving things, are a beginner and are hungry to learn, then absolutely get one for $6.99. Otherwise forget it.. I've had great fun with it, and it's kept me out of my wife's hair for hours, so she approves of it also.If, on the other hand, you're looking for a bargain eyepiece to actually use for astronomical or terrestrial observation, and you've already looked through another eyepiece from it-matters-not-when-or-where, I'd say you could hardly do much worse.The best bargain in zoom eyepieces is the SvBony SV135 7-21mm zoom, also sold here at Amazon. There are several different SvBony zooms; you want the SV135. Do yourself a favor, skip the Datyson and get the SvBony zoom. It’s very good.
Ron
Comentado en los Estados Unidos el 27 de junio de 2021
I saw some negative reviews about this, but went ahead and ordered one. It arrived today, and I was surprised at it's quality. It is not a fake. It's a well made Chinese import.Zoom lenses for telescopes must be refocused each time you adjust the zoom. So, unlike zoom binoculars, they go out of focus as you change the magnification. This is perfectly normal with telescope zoom eyepieces. If you have a high power eyepiece 10mm or smaller, and a low power eyepiece 25mm or larger, you'll notice the same thing. When you switch eyepieces, you have to refocus the telescope.I buy/sell/trade/repair and upgrade telescopes here in the Denver area. I will use this on one of the telescopes that I'm selling. I ordered 8 more of this eyepiece today to use in my telescope hobby business. It's a GREAT deal!
J.E.Y.
Comentado en los Estados Unidos el 20 de diciembre de 2020
Blurry , distorted piece of crap. Worthless. You have been warned.
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