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I have a 12'' meade light bridge, when i try and use my 15mm EP it just wont focus, iv'e been told i need an extension tube but i'm not sure which size to get, going through Ebay they have 35mm/50mm/80mm, i'd hate to end up buying 2 of them if i choose the wrong one.

Also, how much will these extension tubes effect my viewing quality? (if at all), i also plan on using a 4mm/12.5mm EP in future.

Edited by Defender

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Hi, unfortunately i do not have the knowledge or experience to answer your question, but hopefully someone will soon! but remember its 4.50 am in the UK now so everyone is *hopefully* in bed lol

Take care

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try carefully drawing the eyepiece back (even out of the drawtube completely) to see how far back you need go to reach focus.

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try carefully drawing the eyepiece back (even out of the drawtube completely) to see how far back you need go to reach focus.

i think the draw tube isnt going down far enough, it starts clearing but then stops when it cant go down any further.

seams like a pretty big issue if a scope of that quality cant run a 15mm EP or smaller, i phoned the shop i bought it from and spoke to a different sales rep and he seamed to know exactly what i was saying and suggested the smaller ex tube, but if i go with that will i need another for smaller EPs?. sorry guys, im a complete noob lol.

I'm thinking ive stuffed up the colmination or the scopes faulty, the 25mm works a treat, TBH im not sure what an ex tube will do if the focuser isnt drawing in far enough.

Edited by Defender

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oh, if you havent got enough in-focus then a low profile focuser might help but then you dont need an extension tube at all...? usually, most e/ps will come to focus in most supplied focusers without needing extension tubes or low profile focusers.

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oh, if you havent got enough in-focus then a low profile focuser might help but then you dont need an extension tube at all...? usually, most e/ps will come to focus in most supplied focusers without needing extension tubes or low profile focusers.

I havnt played around with this scope a lot, but it came with a 2'' 35mm extender, maybe i need to take that off, that's one thing i havnt tried anyway, i'll give it a go hopefully over the next few days (raining here for a while i think), that's for your help.

Edited by Defender

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I used to have a 12" Lightbridge. Most eyepieces I tried would come to focus OK but that was with no extender - just the focuser tube. The exception was the 26mm QX eyepiece that comes with the scope - that was nearly hanging out of the focusser tube to get to focus - that might be why yours has a 35mm extension - it means that the 26mm comes to focus but others now won't.

Edited by John

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I used to have a 12" Lightbridge. Most eyepieces I tried would come to focus OK but that was with no extender - just the focuser tube. The exception was the 26mm QX eyepiece that comes with the scope - that was nearly hanging out of the focusser tube to get to focus - that might be why yours has a 35mm extension - it means that the 26mm comes to focus but others now won't.

Yeah that's what im thinking now, i didnt even notice the extender untill i had a good look about an hour ago, i bought the scope green as grass TBH, i walked into the shop expecting to pick up a celestron 6" and walked out with a 12'' light bridge lol.

Edited by Defender

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Hi

You will only need the extender in the focuser tube for certain eyepieces.

Always start with it out and see if you get focus.

Hope your rain clears up so you get to use it real soon.:hello2:

Regards Steve

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