Hi Trev .
As good as the Kelner eyepieces were in their day I would personally save up a few more dollars and grab the GSO 'Superviews' from Andrews Communinations about $39 each in 1 1/4 inch and $49 in the 2 inch size , these are a much better eyepiece all round with a much larger field of view 68 degrees compared to 40-45 degrees of the Kelner design and with todays tech in the coatings the SV's will give a way brighter image .
My 5c mate , save your self some grief and get the GSO Superviews .
Brian.