The kit is overpriced. The 4mm eyepiece that comes with it is completely unusable. The eye relief (the space between your eye and the eyepiece) requires you to push your eyeball into the lens. As a matter of fact, nearly all of the eyepieces have horrible eye relief. The one I use most from the kit is the 9mm lens. You have to be pretty close to the opening in order to see anything. All of the eyepieces feel cheap. It seems like they're made in China - completely out of plastic. A few times, pulling the protective cover off of the 9mm, I felt as if I was going to break it. The barlow suffers from the same problem. It's cheap. But at least it's decent. Optically, it's alright. I could see paying $20 for one.
The case everything comes in is actually really nice. It's well built, kind of tough, and has ample space in it. You could easily add a few more eyepieces. Of everything that came with the kit, I plan on holding on to the case for sure. I'm not sure of why or what I should use the filters for. After some reading of the instructions, I discovered I should use the lunar filter (it's blue) to take a picture of the moon with my cell phone. It cut down on the brightness but gave the moon a slight blue tinge. The picture I took looks like it's in grey scale. Before, the moon was way too bright to snap a picture of, so I guess that's one reason to use a filter. I tried out a few more and I don't think I liked them. I'm sure some people know how to use them, but I don't see myself getting much milage out of them for the time being.
If I could do it over again, I'd probably only buy two or three really nice eye pieces. My 6se came with a 25mm. So then I'd get a 10mm X-Cel eyepiece (with more eye relief), a barlow lens, and maybe a wide field eyepiece from Celestron's Ultima LX series. An X-Cel 10mm lens costs $50, a better quality barlow will set you back $35. Already, you'd have a nice set of magnifications with real quality eyepieces that's 40-50 dollars less than the kit. You'll get tons more use out of just those two eyepieces (plus the lens included with your scope) than you will with the kit. I guarantee it. If you wanted to splurge, you could get a wide view eyepiece for $120. After viewing a few messier objects, I'm going to want one.
In conclusion, skip the kit. Figure out which eyepiece you'll want by taking the focal length of your scope and dividing it by the eyepiece. For instance, my scope is a Celestron 6se. It's focal length is 1500mm. So, we find that with the included eyepiece, it has a magnification of 60x. With a 10mm eyepiece, you'll get 150x. With the barlow, you can get 120x and 300x (probably pushing it). You now have a good range of magnifications to see just about anything in the night's sky. If you choose to spend a little more and get a wide field lens as well, you'll be loving life.Buy Celestron Accessory Kit Lowest Price, Order Now! [Click Here!]
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Celestron Accessory Kit