Question 1

I'm looking for a binocular that is exceptionally good in low light to watch feeding owls at dusk and after.  How do these 10x 50's perform?

Accepted Answer

Good low-light performance is almost entirely dependent on the magnification and diameter of the lens. From this you can derive exit pupil diameter and twilight factor which are both important for low-light viewing. These binoculars have an exit pupil of 5mm (50mm lens / 10x magnification), which is close to as wide as human pupils get (~7mm in total darkness). The twilight factor for 10x50mm binoculars are about as good as it gets while still having the magnification and size low enough to avoid excessive shaking of the image from your hand movement.

Many people will try to talk about light transmission as important for low-light, but keep in mind that almost all decent Porro lens binoculars that cost more than $100 or so will have light transmission greater than 80% across most of the visible range. The difference between 80% and e.g. 95% light transmission has a rather small effect on perceived brightness, and really shouldn't be an important factor in choosing your optics. Blue light transmission is more important in low light conditions, and some binoculars have significantly lower or higher transmission in that region of the light spectrum, but still these binoculars have been spec'd at >75% transmission for blue. Keep in mind that the difference in brightness between 95% and 75% transmission is approximately equivalent to the brightness difference between one minute and the next minute during the time between sunset and dusk.

Question 2

The specs say this product weighs 4.8 oz but some of the reviews complain of the weight. Just how much do these binoculars weigh?

Accepted Answer

Weighed in at 36.68 oz and another 5.5 oz for the case and strap. (approx 2.6 lbs all in)

Question 3

Will the 7245 be good for bright moon or star observations. There has been some reviews that state the lenses will distort on a full moon.. ???

Accepted Answer

Actually I use these to observe the moon and they are wonderful. I certainly do not notice any distortion and can see many dozens if not hundreds of moon craters and the image is bright and razor sharp.  I can also easily see the Galilean moons of Jupiter with these.  Jupiter is visible in the early nighttime right now.  The Galilean moons can be clearly seen with these binoculars hand held but for a steady image I highly recommend a heavy tripod with a binocular adapter. The 7245 of course has built in threading for a tripod binoculars adapter.  I was so surprised that such celestial objects are clearly visible with these. Highly recommended.

Question 4

On the product information section it lists batteries: 1 Lithium ion batteries required. What is this for?

Accepted Answer

An error.  Batteries are only required for image stabilization, this binocular is not that type.

ASIN	B0001HKIK4
Age Range Description	Adult
Apparent Angle of View	59.2 degrees
Best Sellers Rank	#2,491 in Camera & Photo Products ( See Top 100 in Camera & Photo Products ) #1,182 in Binoculars
Brand	Nikon
Built-In Media	Action EX Extreme All-Terrain Binocular
Coating	yes
Color	Black
Compatible Devices	tripod mount devices
Customer Reviews	4.7 4.7 out of 5 stars (1,107)
Diopter Adjustment Range	80mm
Enclosure Material	Polycarbonate (PC)
Exit-Pupil Diameter	5 millimeters
Eye Relief	17.2 millimeters
Features	Lightweight, Waterproof
Field of View	6.5 degrees
Focus Description	Manual focus
Focus Type	Center Focus
Global Trade Identification Number	00018208072453, 00018208724536
Item Dimensions L x W	9.5"L x 8.4"W
Item Part Number	BAA663AA
Item Type Name	Action EX Extreme All-Terrain Binocular
Item Weight	1.02 g
Low Light Technology	yes
Magnification Maximum	10
Manufacturer	Nikon Sport Optics
Manufacturer Part Number	BAA663AA
Model Name	BAA663AA
Model Number	BAA663AA
Mount Type	Tripod Mount
Number of Items	1
Objective Lens Diameter	50 millimeters
Prism Type	BAK-4
Relative Brightness	25
Size Map	Full Size
Specific Uses	Hunting and Shooting or Sports, Hiking and Outdoors, Travel, Marine, Bird Watching
UPC	018208072453
Unit Count	1 Count
Water Resistance Level	Waterproof
Zoom Ratio	10 multiplier_x

Nikon 7245 Action 10x50 EX Extreme All-Terrain Binocular

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