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The 20mm is my 'sweeper', has about the same FOV as the 2" 32mm Kellner. Also does well on Nebs and globs. The 15mm gets me in just the bit closer without losing brightness. Cost about $49 each over here and they were the first 'upgrades' I got when I got the blue 4.5" newt. I just wish my Barlow was of the same quality, it's next to useless. I use it as an extender (unscrew the lens) more than a Barlow.
Should look for another really.
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