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I have a Celestron Ultima 2x barlow, Televue 3x barlow, and 2.5x and 4x Powermates.
I do almost all my imaging with the 3x.
For visual the Ultima is very nice although from memory I seem to recall it being just a smidge "warm" in terms of introduced colour. Haven't barlowed visual for quite some time.
I do seem to remember Jupiter looking very impressive through the 24mm Panoptic in the 2x Ultima... in the 9.25
It just seemed to tint things slightly.
The Powermates are superb imaging tools also.
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