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CESDewar
GorillAstronomer
Reged: 01/16/05
Posts: 1811
Loc: Morganton, GA, USA
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Re: 100 Hercules at 10x
06/16/08 12:33 AM
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I spent some 30 minutes on 100 Hercules tonight.
Cutting to the chase....I got a clean split in my 11x56 Garrett's, but it did take quite some time to get them perfectly focussed to do this. These are great binoculars for under $100 shipped. Yes there is edge falloff, but the central sharpness is excellent.
By a clean split, I mean that I got the visual appearance of headlights - two tiny but definitely separated dots. It didn't happen every time I looked - and the Garrett's do not hold focus very well, so there was quite a bit of fiddling. I was actually quite surprised as my vision is average at best and my left eye is intentionally under-corrected by some 3+ diopters so I don't need reading glasses. This creates problems sometimes in getting both barrels to focus. Of course, I had the Garrett's mounted on a good tripod to do this.
Next I tried my 10x42mm - these Leica Ultra-Vids are obviously super-premium binoculars but the drop from 11x to 10x, in spite of the better optics, did not result in a split. I would describe it as a figure-8. Certainly close to splitting but at no point did I get that sensation of "headlights" that tells me it was a clean split. I spent another 10 minutes with them, but with no further gain. The Leicas have a much better edge and excellent contrast, but I have to say the Garrett's were a good match in the center.
Finally, I looked at it handheld in my 18x50 Canon's - that was an easy split and I expected that as I have seen tighter pairs in the 18x50's - on one occasion I definitely got 3 stars in the Trapezium with them. I do find it is important to focus these with the IS off and then engaging the IS to get the sharpest views.
Oh, and one final comment, I have a sneaking suspicion the 11x56's are slightly more than 11x - at some point I'm going to try and measure that more accurately, but it just seems like more than a 10% jump over my 10x42's.
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Edited by CESDewar (06/16/08 12:36 AM)
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