Autore: pat69
Data: 12-09-05 20:44
Se può interessare a qualcuno, da Astronomics:
http://www.astronomics.com/main/TeleVue_48mm_125_NaglerENA048.asp/catalog_name/Astronomics/category_name/Home/product_id/TN0
Qui se ne parla:
http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/721194/page/0/view/collapsed/sb/5/o/all/fpart/1
Recensione di Ed Ting:
Ed Ting - TeleVue Nagler 4.8 mm
(Type 1, $205 list, $170-$190 street)
A sharp-to-the-edge eyepiece with one small problem. The eye relief is so short that you have to practically place your eye on the lens to appreciateits wide field of view. Relief is rated at 7 mm, but I've found that you'll need to subtract 4-5 mm from this figure in actual use. The eye lens is also on the small side (only about 9 mm or so in diameter.)
If you can accept the short eye relief, the 4.8 is a fantastic, sharp eyepiece for splitting double stars or resolving planetary detail. The 4.8 mm and the 7 mm are about the same size, but the 4.8 is about 15 mm shorter, and a little lighter.
The 4.8 mm was once considered the ultimate high power eyepiece. While it is still a world-class eyepiece, there is now some significant competition. Vixen's Lanthanums (4 mm or 5 mm) have 20 mm of eye relief, as does the Pentax 5.2 mm SMC-XL. Some feel the Pentax is sharper as well (it should be, at almost twice the cost!)
In short, while not mandatory, the 4.8 mm Nagler is a nice luxury to have in your eyepiece case.
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Ciao
Patrizio
Celestron CGE 1400 XLT, Meade LX90 EMC
42°19'N, 13°19'E (AQ)
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