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Hi Solanum, this is not an easy answer because everyone see's differently(looking for different anomaly) The old rule, size of objective multiplied by mm of EP @ 254mm of diameter, a 12-14mm is your sweet spot giving 20x per inch of aperture, this would be an excelence size for a space walk ep if intending of going down that path. As for a 40mm I went for a GSO 2"kelner it has good flat field in a f5 12" showing good colour and contrast. For the moon its magnitude is what you will be trying to control the most. Don't laugh too loudly, but I made an ep from a pentax binocular optic and the 1.25 barlow the contrast and detail it draws out is excelent, and not eye ball scorching so it can be enjoyed for hours. An eye patch is useful if you don't already have one for your relaxed eye. Don't give up on those plossils try screwing a barlow element onto the end of them, this gives a 1.5 multiplier and its the only time I use a barlow element. My favorite star splitter is an old 10mm plossil with the barlow element on the end making a 6.6ep with good eye relief and 230x in my scope. Don't stress too much about a barlow IMO you would be better off with an ortho in your collection sheerly for the clearest viewing possible. My decisions were curtailed down by the fact I want a lunar and planetary scope to complement my DSO 12" Light Bridge. Experiment with what you have. Try to buy once, how many expensive ep's do you see being traded it is the ones that aren't there that you want. Good luck and when you buy it might clear up in Brizzy.
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