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I think on the dob (mine is 1250mm focal length) that 7mm is a little on the low powered side.
I use a 14mm Pentax barlowed for my main planetary mag and if the seeing wont support that I dont bother looking at planets. My barlow although rated at 2x , actually gives 2.2x measured giving me an effective focal length of 6.4mm.
If only pentax made a 6mm xw , i would probably buy one.
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