does this have an eyecup or do you just hold it a short distance from your eye? Some review pictures show an eyecup others don't.

There is a molded rubber eye aperture that is removable but not adjustable. It is not a cup per se, it's convex or sort of domed with a peephole aperture.

how is the battery installed?

There's no battery in the monocular itself... it's all manual. If you have the full kit, the special close-up attachment (looks like an inverted eye cup) has a coin-opened hatch for a pair of CR2032 coin cells (not included) to power the 2 illuminator LEDs.

Will this mate correctly with an iPhone 11s

The phone mount is generic. But it's fussy getting it on my Pixel 5.

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Pentax VD 4x20 WP versatile 3 in 1 binoculars, monoculars and telescope Bright, clear, high contrast, excellent optical performance, high waterproof performance Minimum focussing distance of 50cm

Product ID: 227637378

Details

Brand
Pentax
Compatible devices
Tripod
Eye piece lens description
Plossl
Focus type
Fixed Focus
Item weight
12.16 Ounces
Lens coating description
Scratch

🌊1m waterproof rating

🔍4x magnification binoculars

🔭16x telescope mode

€ 413.52

Duties & taxes included

In stock

Sold byAmazon IrelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔭 See More, Share More, Explore More — The Ultimate 3-in-1 Optical Experience

CLOSE UP CLARITY - Focus as near as 50cm for detailed observation of nearby subjects without losing sharpness.
CRYSTAL CLEAR OPTICS - Fully multi-coated lenses with phase and dielectric coatings deliver bright, sharp, high-contrast views with minimal glare.
COMFORT MEETS FUNCTION - 19mm long eye relief reduces eye strain and allows comfortable use with glasses during extended viewing.
TRIPLE MODE VERSATILITY - Switch effortlessly between binoculars, dual monoculars, or a powerful 16x telescope to suit every adventure.
WEATHERPROOF DURABILITY - 1-meter waterproof design and rugged rubber coating ensure reliable performance rain or shine.

The Pentax VD 4x20 WP is a versatile 3-in-1 optical device combining binoculars, two monoculars, and a 16x telescope. Engineered with fully multi-coated optics and advanced phase and dielectric coatings, it delivers bright, high-contrast images. Its waterproof and shock-resistant rubber body ensures durability in all weather conditions. With a minimum focusing distance of 50cm and long eye relief, it offers comfortable, detailed viewing for professionals and enthusiasts alike.

Specifications

ASIN	B08DXL9FMB
Age Range Description	Adult
Best Sellers Rank	132,686 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 1,051 in Binoculars
Box Contents	Binoculars, Case, Strap
Brand Name	Pentax
Coating	Scratch resistant, anti-glare
Compatible Devices	Tripod
Customer Reviews	4.3 4.3 out of 5 stars (47)
Exit Pupil Diameter	5 Millimeters
Eye Piece Lens Description	Plossl
Field Of View	429 Feet
Focal Length Description	50 centimeters
Focus Type	Fixed Focus
Global Trade Identification Number	00027075301702
Item Weight	12.16 Ounces
Manufacturer	PENTAX
Manufacturer Part Number	63600
Model Name	VD 4x20 WP
Model Number	63600
Mount	Altazimuth Mount
Number of Batteries	1 Nonstandard Battery batteries required.
Number of Items	1
Objective Lens Diameter	20 Millimetres
Product Features	Waterproof
UPC	027075301702
Unit Count	1.0 count
Zoom Ratio	4:1

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