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tiredboy

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Posts posted by tiredboy

  1. I also have an ETX 80 AT.

    I also received a Barlow lense as part of an eyepiece set that came with the scope as a package deal. It is MUCH easier to use switch out Barlow and requires minimal refocusing, if at all, depending on the eyepiece in use.

    OK, so I posted elsewhere about my ETX-80 flip barlow problem (knob not tight, barlow slides in unless I hold knob). I've had a couple of people suggests fixes but I'm starting to lean towards fixing it in place and buying a serperate barlow. A coupld of questions:

    1) What barlow did you get as I've seen a couple of people post that the barlow they bought won't focus as not enough focus travel

    2) Have you used it with a webcam? I have a modded philips but can only use it with the barlow flipped in (can get enough focus travel without barlow).

    Thanks in advance.

  2. IF YOU HAVE A FAST SCOPE, say, f/5, this formula will suggest a 3.75mm or 4mm eyepiece. Looking through a Plossl at this length is a miserable experience. If this is the case, I would suggest you buy an eyepiece with a length equal to 1½ times your focal ratio, and buy a 2x Barlow lens in the same price range as your eps. These purchases give you your high power and medium-high power magnifications, so skip the next paragraph.

    I got a Meade etx80 for Christmas as my first telescope. It came with the standard Super Plössl eyepieces (SP9.7mm, SP26mm). As I'm still getting used to it I probably don't need to buy anything else just yet (except the camera which is on its way!) but what would be the next lens? Reading the info above it would be a 7.5mm and a 2x Barlow. Unless I've misunderstood, the 9.7 gives me 41x magnification. Would it make most sense to add a 2x Barlow as my next investment?

    Just to clarify my ignorance I still haven't mastered the telescope so know that there is a mirror change dial to increase magnification but not sure what it changes (ie how it affects the magnification). According to the Meade site it says that the Maximum Practical Visual Power is x275 and I seem a long way off this at the moment if my calculations are correct (even if I add a x2 Barlow).

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