I have both the bintel and the mogg one and prefer the mogg one thought the bintel ones are metal construction while the mogg ones are a hardened "plastic". While I may be the exception, I could not get my meade one to focus sharply. I compared both FR on the same night in the same equipment. If you are getting the mogg one get mogg the extension, it will then give you the 0.5 you need. I use it in my 8" Meade SCT.
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