Guest MrsR Posted November 12, 2012 Share Posted November 12, 2012 So I'm trying to focus my Dob 250 on a far away object - I can find it through the finder scope but through the eyepiece nothing just a mass of out of focus blurs - what am I doing wrong? It's something stupid I know Link to comment Share on other sites More sharing options...
Guest Kheldar Posted November 12, 2012 Share Posted November 12, 2012 Your far away object might not be far away enough? Focusing that thing on a terrestrial target will be tricky I suspect. You could try releasing the eyepiece and moving it slowly away from the focuser tube and see if anything sharpens up, I suspect back focus is the problem. However could be collimation, do you know how to check it? Link to comment Share on other sites More sharing options...
Guest MrsR Posted November 12, 2012 Share Posted November 12, 2012 No idea how to check that no Link to comment Share on other sites More sharing options...
Guest Kheldar Posted November 12, 2012 Share Posted November 12, 2012 No idea how to check that no Mostly likely not that, for now have a go and moving the eyepiece further away, and ideally aim it up this evening if a gap in the clouds appears Link to comment Share on other sites More sharing options...
Guest MrsR Posted November 12, 2012 Share Posted November 12, 2012 Makes no difference when I move the eyepiece further away Link to comment Share on other sites More sharing options...
Guest Kheldar Posted November 12, 2012 Share Posted November 12, 2012 Makes no difference when I move the eyepiece further away Just to check the fine details then: Have you racked the focuser all the way out? How far away from the focuser have you moved the eyepiece? What eyepiece are you using? Link to comment Share on other sites More sharing options...
Guest MrsR Posted November 12, 2012 Share Posted November 12, 2012 I've racked the focuser fully in and out. I've taken then eyepiece a foot away and I've tried both a 10mm and 25mm Link to comment Share on other sites More sharing options...
BAZ Posted November 12, 2012 Share Posted November 12, 2012 It could be the collimation is out. Can you see daylight through it, or does it look dark? Link to comment Share on other sites More sharing options...
Guest MrsR Posted November 12, 2012 Share Posted November 12, 2012 Can see daylight. It's like when you are trying to focus bins and its never coming into focus Link to comment Share on other sites More sharing options...
Guest DN18 Posted November 12, 2012 Share Posted November 12, 2012 Can you post an image of how you,ve got the focuser/eyepiece set up. This may help shed some light (no pun intended) Link to comment Share on other sites More sharing options...
Guest MrsR Posted November 12, 2012 Share Posted November 12, 2012 Link to comment Share on other sites More sharing options...
Guest MrsR Posted November 12, 2012 Share Posted November 12, 2012 Have I done something stupid? Link to comment Share on other sites More sharing options...
BAZ Posted November 12, 2012 Share Posted November 12, 2012 PM'ed you. Link to comment Share on other sites More sharing options...
Guest MrsR Posted November 12, 2012 Share Posted November 12, 2012 Yay Super Baz to the rescue tomorrow evening - my hero )) Link to comment Share on other sites More sharing options...
catman161 Posted November 12, 2012 Share Posted November 12, 2012 First mod get the Lacerta 10:1 dual speed focuser kit Then follow Martyn's awesome guide to installing it Link to comment Share on other sites More sharing options...
Doc Posted November 12, 2012 Share Posted November 12, 2012 Where did you buy the Lacerta 10:1 dual speed focuser kit from Baz? Link to comment Share on other sites More sharing options...
Brantuk Posted November 12, 2012 Share Posted November 12, 2012 365 Astronomy Mick - Zoltan's the man (or something like that) - I have one too and it's very good - quick turn around and good service as well Link to comment Share on other sites More sharing options...
Doc Posted November 12, 2012 Share Posted November 12, 2012 Cool I'll have a look Kim. Link to comment Share on other sites More sharing options...
Guest MrsR Posted November 12, 2012 Share Posted November 12, 2012 Doc it's who I bought my scope from ordered Friday and arrived today Monday Link to comment Share on other sites More sharing options...
Doc Posted November 12, 2012 Share Posted November 12, 2012 Doc it's who I bought my scope from ordered Friday and arrived today Monday Thanks Nikki Thats good sevice. Link to comment Share on other sites More sharing options...
Tweedledee Posted November 12, 2012 Share Posted November 12, 2012 I've had several dealings with Zoltan at 365 and he seems very efficient and gives very quick service. Any problems and Zoltan sorts it immediately, no messing. Link to comment Share on other sites More sharing options...
Brantuk Posted November 12, 2012 Share Posted November 12, 2012 He's a good guy from my dealings with him Link to comment Share on other sites More sharing options...
Perkil8r Posted November 13, 2012 Share Posted November 13, 2012 I've had a couple of odds and ends from 365 and they were really very good indeed. Link to comment Share on other sites More sharing options...
Perkil8r Posted November 13, 2012 Share Posted November 13, 2012 For what it's worth, recently there was another member who had this problem. The issue was moving the focus too far and too fast, thus missing the sweet spot in the process. Best tip I would give with this scope for visual is, bung an eye piece in, just as you show in your picture. Move the focuser all the way out. Gradually and smoothly bring the focusser inwards whilst targeting something a long old way off. With my 200p 1/4 mile isn't far enough away, so it needs to be something say half a mile or further away. The focused point is only around 1mm of travel when you find it which is why it is easy to miss it all together if you are being a bit over enthusiastic with the focus wheels. Link to comment Share on other sites More sharing options...
Doc Posted November 13, 2012 Share Posted November 13, 2012 I totally agree with Mike. I have helped a few people new to this hobby who had the same problem and it's always been focusing issues. Link to comment Share on other sites More sharing options...
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