badgerchap Posted August 31, 2013 Share Posted August 31, 2013 Thinking about a TV Powermate for the 300P to start a bit of Imaging, once Jupiter comes up later on in the year. I'll be using a 1.25" fitting as a) it's cheaper and my cams will fit. Seeing as the 'scope is f/5, is there a preferable Powermate, or should I just go for all out power and get the 5x?Cheers as always Link to comment Share on other sites More sharing options...
badgerchap Posted August 31, 2013 Author Share Posted August 31, 2013 Disappointing. I thought there'd be a good old bit of opinion on this. Oh well!Typed inexpertly from my phone Link to comment Share on other sites More sharing options...
Laurie61 Posted August 31, 2013 Share Posted August 31, 2013 You want to aim for around f 30, so a 5x barlow will get you close. The conditions on the night and height of your target will affect howlong a focal length you can operate at. Link to comment Share on other sites More sharing options...
RAC Posted August 31, 2013 Share Posted August 31, 2013 5x would be the most I would go. I have a 5x powermate with a 10" f4 and I wouldn't want it any more dim. It also depends on your camera. I would personally aim for f15-f20 but that's just me and i'm only just getting into this planetary game myself. Link to comment Share on other sites More sharing options...
badgerchap Posted September 1, 2013 Author Share Posted September 1, 2013 Cheers chaps, for the input. I suppose the limitations to power experienced by observers are less of an issue, with regards to the whole video capture scenario? By which I mean our rubbish seeing isn't so much of a hindrance to a higher powered setup? Link to comment Share on other sites More sharing options...
RAC Posted September 1, 2013 Share Posted September 1, 2013 The seeing will still knock the end result around a lot but its then even more important to be able to get a good framerate with the camera. For Saturn I wouldn't want to image over f20, not sure about the others. Link to comment Share on other sites More sharing options...
Freddie Posted September 1, 2013 Share Posted September 1, 2013 The majority of my latest images (see planetary gallery) are at F50. Set-up, sky conditions and equipment used obviously has an impact on what does and doesn't work though. Link to comment Share on other sites More sharing options...
Laurie61 Posted September 1, 2013 Share Posted September 1, 2013 If you want to delve a bit deeper into the theory behind appropriate image scales to use this article covers the relevant bits.Its all about sampling http://www.astropix.com/wp/2011/03/01/sampling-and-pixel-size/ Link to comment Share on other sites More sharing options...
JamesF Posted September 1, 2013 Share Posted September 1, 2013 Is this a motorised dob, or manual? If it's manual I think I'd try without a barlow/powermate at all to start with. Imaging at an effective focal length of 7.5m with the 5x powermate will be quite a challenge I think.James Link to comment Share on other sites More sharing options...
badgerchap Posted September 2, 2013 Author Share Posted September 2, 2013 Motorised, thankfully! I have had a stab at Saturn at lower fl but the detail was disappointing. Looks like a pair of Barlows may actually be the answer, maybe a 3x and a 5x to get f 15 and f25Typed inexpertly from my phone Link to comment Share on other sites More sharing options...
badgerchap Posted September 2, 2013 Author Share Posted September 2, 2013 Sorry James, it's not a dob, it's GE mountedTyped inexpertly from my phone Link to comment Share on other sites More sharing options...
JamesF Posted September 2, 2013 Share Posted September 2, 2013 Ah, on a GEM you stand a much better chance. In that case I'd probably go for the 5x PowerMate. Working up to it still sounds like a good idea though. At that sort of focal length it's only going to take the tiniest wobble to shift the image off the sensor, so practising at the easier multiplier first probably makes sense.James Link to comment Share on other sites More sharing options...
stuy Posted September 2, 2013 Share Posted September 2, 2013 Thinking about a TV Powermate for the 300P to start a bit of Imaging, once Jupiter comes up later on in the year. I'll be using a 1.25" fitting as a) it's cheaper and my cams will fit. Seeing as the 'scope is f/5, is there a preferable Powermate, or should I just go for all out power and get the 5x?Cheers as always hi i would go for the 5x powermate brings your scope up to F25 Iish which is ideal when the seeing permits you could stack other systems to try and get around F30-45!!! hope this helps stuy Link to comment Share on other sites More sharing options...
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