Guest Jezmangasman Posted October 1, 2013 Share Posted October 1, 2013 Ok, so birthday telescope built. Skywatcher 70mmx900mm on an EQ1 mount. Got a T-ring adapter for my Nikon (fits the camera fine as you would expect!). I can attach it to the scope no problem at all, but I cannot figure out how to fit anything in to give any sort of magnification! Normally I would have the focus tube, eye piece, diagonal mirror, Barlow then another lens e.g. 25 (successfully saw Saturn a while back, may have gotten a little excited) and watch away. But the only way I can find to fit the camera with the T-ring is straight onto the eyepiece on the focus tube leaving no place for any magnification. All manner of permutations seem to have drawn a blank. Clearly I have missed something. Not entirely sure what it is though! Any wiser folks tell me my obvious error here? Thanks Jeremy Link to comment Share on other sites More sharing options...
Guest foundaplanet Posted October 1, 2013 Share Posted October 1, 2013 Yep your right. Camera connected to t-adapter and straight into telescope. Magnification is kind of irrelevant as it works on focal length of scope and the chip size (camera sensor). I think it is telescope focal length divided by the diagonal measurement of the chip if you want to work out the magnification. So to get images of varying sizes you need scopes with different focal lengths and or cameras with different chip sizes.. Hence why astro photography can get extremely expensive... Link to comment Share on other sites More sharing options...
Sheila Posted October 1, 2013 Share Posted October 1, 2013 telescope OTA is your magnification Link to comment Share on other sites More sharing options...
Guest Jezmangasman Posted October 1, 2013 Share Posted October 1, 2013 Ah, thanks. Will have a go at something easy (the moon perhaps) and then factor in Christmas present money for more expensive stuff. Link to comment Share on other sites More sharing options...
T A WOW Posted October 1, 2013 Share Posted October 1, 2013 You could try baader Hyperion eyepieces. They can be used for photo/visual and you will get many different focal lengths/magnifications. I've got a Nikon t-ring so if we get to the next meet you could try them out if you like. Link to comment Share on other sites More sharing options...
dawson Posted October 1, 2013 Share Posted October 1, 2013 (edited) If you DSLR is attached directly to the telescope with no eye pieces or lenses between, that is called prime focus, as Sheila says, the telescope is providing the 'magnification; your 900mm focal length telescope is mimicking a 900mm telephoto lens. For my 2700mm scope, that is a 2700mm telephoto lens. As Tobias [the elder] says, the Baader Hyperion eye pieces allow you to screw a ring onto the eye piece and then attach a DSLR on top of the eye piece; afocal DSLR imaging: http://www.alpineastro.com/Eyepieces_Accessories/Images/Zoom_MKIII_EOS_Med.jpg James Edited October 1, 2013 by dawson Link to comment Share on other sites More sharing options...
Guest Jezmangasman Posted October 3, 2013 Share Posted October 3, 2013 Thanks Tobias and James. I'll have a look at those. Although I have not seen any clear sky for a while.... Link to comment Share on other sites More sharing options...
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