Nikon website says these are porro prism binoculars but Bill O (below in answered questions) says they are roof prisms. Which is it?

Roof prisms vs Porro prismsPorro prism binoculars were standard until the 1960's, when the Zeiss and Leitz companies introduced roof prism binoculars, whose objective lenses were straight in line with the eyepieces. Roof prism binoculars were compact, light, and comfortable to hold. They made the offset, zig-zag shape of the Porro prism design look as old fashioned as propeller-driven aircraft.Porro prism design has a jog in the light path through each barrel. Roof prism design looks as if the light goes straight through.

My eyes are not of equal strength. Does this model have a good range of compensation?

Yes, for each eye you can regulate, very good view

Nikon 7239 Action Ex 7x50 Cf Binocular Black

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Description

🔭 See More, Miss Less — Elevate Every Adventure with Nikon Action EX!

ALL WEATHER READY - Waterproof and fog-proof design with nitrogen gas filling keeps your view pristine in any condition.
RUGGED RELIABLE - Durable rubber armoring offers shock resistance and a secure, ergonomic grip for active use.
BALANCED PORTABLE - Lightweight 3-pound build with tripod mount compatibility for steady, extended viewing sessions.
CRYSTAL CLEAR VISION - Multilayer-coated 50mm lenses deliver bright, sharp images with minimal distortion.
COMFORT MEETS PRECISION - High-eyepoint and multi-click rubber eyecups ensure perfect eye positioning—even with glasses.

The Nikon 7239 Action EX 7x50 CF Binoculars combine professional-grade optics with rugged durability. Featuring 7x magnification and large 50mm objective lenses with multilayer coatings, they deliver bright, distortion-free images. Waterproof up to 1 meter for 5 minutes and fog-proof with nitrogen gas filling, these binoculars are built for all-weather outdoor use. The high-eyepoint design and adjustable rubber eyecups provide comfortable viewing even for eyeglass wearers, while rubber armoring ensures shock resistance and a firm grip. Lightweight yet balanced, they include a tripod mount for versatile stability, making them the perfect companion for hiking, wildlife observation, and extreme terrain exploration.

Specifications

ASIN	B0001EFIGQ
Age Range Description	Adult
Apparent Angle of View	42.7 Degrees
Best Sellers Rank	#107,522 in Electronics ( See Top 100 in Electronics ) #440 in Binoculars
Brand	Nikon
Built-In Media	Action EX Extreme All-Terrain Binocular
Coating	Multi-coated
Color	Black
Compatible Devices	Smartphone
Customer Reviews	4.6 4.6 out of 5 stars (243)
Diopter Adjustment Range	+/-5 diopters
Enclosure Material	Rubber
Exit-Pupil Diameter	7.1 Millimeters
Eye Relief	17 Millimeters
Features	Fog Proof
Field of View	7.15 Degrees
Focus Description	Manual Focus
Focus Type	Center Focus
Global Trade Identification Number	00018208072392
Item Dimensions L x W	24.4L x 21.3W centimeters
Item Dimensions L x W x H	36.8L x 19.4W x 6H centimeters
Item Highlight	Field of view of 335 feet Smooth central focus
Item Part Number	BAA662AA
Item Type Name	Action EX Extreme All-Terrain Binocular
Item Weight	1.36 Kilograms
Low Light Technology	yes
Magnification Maximum	7
Manufacturer	Nikon
Manufacturer Part Number	7239
Model Name	7239
Model Number	7239
Mount Type	Tripod Mount
Number of Items	1
Objective Lens Diameter	50 Millimeters
Prism Type	Porro Prism
Relative Brightness	7.14
Size Map	Full Size
Specific Uses	Hiking and Outdoors
UPC	018208072392
Unit Count	1 Count
Water Resistance Level	Waterproof
Zoom Ratio	7:1

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Nikon 7239 Action EX 7x50 CF Binocular, Black

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Description

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Common Questions