boothbenny25 Posted June 24, 2013 Share Posted June 24, 2013 What would be the best eye piece for max mag on my skywatcher 130 eq2 I have the standard 25mm and 10mm and a 2x Barlow at the moment Link to comment Share on other sites More sharing options...
John Posted June 24, 2013 Share Posted June 24, 2013 Is your Skywatcher 130 the 900mm or 650mm focal length one ?.This will make a difference to the magnification that eyepieces give. Link to comment Share on other sites More sharing options...
boothbenny25 Posted June 24, 2013 Author Share Posted June 24, 2013 Sorry 900mm Link to comment Share on other sites More sharing options...
rowan46 Posted June 24, 2013 Share Posted June 24, 2013 your theoretical maximum magnification assuming perfect optics is 2 x your apparture in mm ie 260. British seeing is limited to about 180x max so you are looking at an eyepice that will take you as close under and not over that limit. Magnification is telecope focal length (900) divided by eyepiece focal length or to work out the eyepiece focal length 900 divided by 180 which equals 5mm but remember thats for a fairly good day and the moon will take higher magnifications but somewhere around the 5-6 will be your top on planets with 4 being top on the moon Link to comment Share on other sites More sharing options...
ronl Posted June 24, 2013 Share Posted June 24, 2013 Try this link http://www.swindonst...s/eyepieces.htm it's a verygood guide to eyepieces and right at the bottom of the page thereis a link, how to calculate eyepiece magnification and TFoV.Hope this helps Link to comment Share on other sites More sharing options...
Schorhr Posted June 24, 2013 Share Posted June 24, 2013 I love going up to 260x on my 130/650 or even overmafnifIng a little on moon and planets, so a hr-planetary 3.2-4mm on 900mm would be nice, but as said, rarely possible. Perhaps a 6mm UWA €32 and 2x Barlow 16€ in case the seeing is superb? Link to comment Share on other sites More sharing options...
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