Thank you all for your replies. I am very tempted. Its seems to me to me about the largest aperture in a refractor that I can buy that is decent in both quality and in weight, as well as $s. (Nobody please mention the Skywatcher 6"- I obtained a 120mm F8 in a swap about 10 years ago and the image clarity was very disappointing; I sold it for almost nothing, so please don't go there).
Quote:
Originally Posted by Tinderboxsky
The 140 is unquestionably my first choice for all double star, globular and open clusters, nebula, planetary nebula and galaxies etc observing at all magnifications and exit pupil sizes.
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Thanks Steve, this has helped. I was surprised to see double stars mentioned here. My thinking was that the extra size of the 140mm lens may better display contrasting colours in double stars, but not generally an instrument to be used for most doubles.
I have moved away from the big reflectors, but strangely, this is the thing that I miss most about them. The really do show colourful doubles very well.