eye pieces

[boothbenny25]

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

[John]

Is your Skywatcher 130 the 900mm or 650mm focal length one ?.

This will make a difference to the magnification that eyepieces give.

[boothbenny25]

Sorry 900mm

[rowan46]

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

[ronl]

Try this link http://www.swindonst...s/eyepieces.htm it's a very

good guide to eyepieces and right at the bottom of the page there

is a link, how to calculate eyepiece magnification and TFoV.

Hope this helps

[Schorhr]

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?