Quote:
Originally Posted by MortonH
Even though the specs appear the same there definitely are differences between different models based on what I've read. For example, apparently one cheap zoom (possibly Seben, I can't remember now) has plastic lenses and is awful.
However, my impression is that once you reach a certain price point the quality is the same or similar, and paying more might not be worth it. I'm trying to figure out that point!  |
There may be zooms out there with plastic lenses; I have the cheap Seben 7.5 - 22.5 mm zoom, and it has glass, not plastic. While it may not suit enthusiasts, it's a great eyepiece for beginners; optical quality is certainly comparable to my SkyWatcher and Seben Orbinar fixed-FL Plossls. (And I'm not the only one who thinks it is great value - check out this thread for example:
http://stargazerslounge.com/topic/19...zoom-eyepiece/ )
[EDIT: According to this post
http://stargazerslounge.com/topic/19...ece/?p=2126037 the Seben 7.5 - 22.5 uses both glass and plastic elements. This may be the case - but I'm still very impressed with the optical image quality for the asking price.]