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Message: <blockquote data-quote="Binastro" data-source="post: 3640895" data-attributes="member: 111403">Hi HW.I don't think that is entirely true.Some binoculars, if one is lucky can give much better resolution than the normal magnification.My selected Japanese Celestron 20x80 gave much better resolution with a 7x binocular behind it.I was able to read a hotel sign at 11 miles, when it was quite impossible at 20x.Probably 80x would have been ideal, but I didn't have a 4x binocular to hand.With the early 35mm rangefinder cameras one had the option of 35mmm, 50mm and 85mm focal lengths with front afocal components.The inter lens shutter had the common rear component.I have several 1.4x teleconverters that I use with good camera lenses, usually telephotos, which I use with Japanese monocular converters with 10mm erect image eyepieces.I also use 2x or 2x to 3x teleconverters.With the Vivitar Series 1 600mm f/8 solid Cat I could easily separate both components of epsilon Lyrae at 180x with clear space between the double stars about 2.5 arcsecond separation.</blockquote>