Quote:
Originally Posted by warpsl
Hi.i suggest you avoid most cheap Chinese made binoculars.undersize prisms,out of collimation,barrell misalignment.pentax sp models being the exception.i have 10x50 fujinon fmt-sx and it is the best in that size range.and because of the wide set objectives it gives an amazing 3d effect.digidirect or aec are your best places to buy Fuji.regards.
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And most cheaper binos have a smaller aperture than claimed. I have had Celestron "15x70" binos for 140 euros ($210) but their prisms were too small and the flashlight test revealed only 65mm. Another "50mm" was actually 46mm. This is done for concealing too small prisms and color errors.
Shine a flashlight through one of the eyepieces and measure the image circle projected on the objective side. That is the actual aperture.
I have a 16x56 (yes 56 real mm) and that goes deeper than 10x50 (darker sky background) and are yet not too shaky for handheld use. Under the dark Australian sky these are awesome, nice views of Eta, Orion nebula or LMC and can even resolve Omega Centauri or 47 Tuc.