Not a peep from Kyoei-Osaka on the 10x70 SP, so I am going to set that aside for now.
The Resolux 10x70 isn't on the same performance level optically, and particularly with regard to edge sharpness, but I'm so pleased with the binocular overall I'm just not going to fret about it. Also, owning the biggest ever "10x50" is so much fun I've decided to keep the instrument. Not expecting a discount from Orion, since they offered to replace it with free return shipping, but I'm still going to call it Big Jon.
(Maybe even Big Bad Jon when I am in a Johnny Cash mood.)
I had a great observing session from my suburban backyard last night, one of the highlights of which was observing M81/82 -- any sighting of a galaxy other than M31 from Bortle 7 skies is a bonus round for sure.
I was out with the 82XL, 15x70 Ultra, 10x70 Resolux (swapping them back and forth on the PM1 p-gram mount), and my XT8 Dob. M 81 was easily seen with the 10x70, and 82 could be occasionally glimpsed in averted. Close to the limit for that instrument under such skies. The view with the 82XL and 14mm eyepieces was surprisingly fine given the light pollution.
Fiske
Hello Fiske,
and thank you for the first light impressions!
Both the Nikon SP, and the BA8, have similar front lenses: Cemented doublets.
The tubes interiors have rough paint on the Nikon, black micro ridges on the BA8.
And the main difference is in the eyepieces, as checked with the green laser poninter:
Nikon has the lenses sequence (field stop - 2 - 1 - 1) with a small diameter eye lens and short eye relief.
BA8 has the inversed lenses sequence (field stop - 1 - 1 - 2) with the large diameter eye lens for a longer eye relief.
The cemented bonding of the doublets looks like from everywhere in Asia Pacific, with the typical diffuse spot on the cemented interface.
Otherwise the diffuse laser beam traces are comparable on these both binoculars.
Clear skies,
JG
PS: I have written a review on these both binoculars back in the past, and using the both binoculars since that time.
The BA8 binoculars show some variation when coming from the manufacturing, I have chosen the visibly better one from two when visiting Teleskop Service.