Best Objective Lens Size

12x50 Professional Binoculars, Includes Phone Holder, 50mm Objective， Vision More Brighter and Bigger Than Xx42, More Concentrated Light,

【50mm large objective lens, larger image, clearer details】 The field of view of 42mm objective lens is 1.41 times (such as 10x42, 12x42, 8x42 binoculars), and 5.16 times of 22mm objective lens (such as ordinary 10x22, 12x22 binoculars). Large objective binoculars make full use of the advantages of the 50mm objective lens to provide larger images and ensure clearer details.
【50mm objective binoculars, super bright, clear field of view】 Collect 41% more light than 42mm objective (such as 10x42, 12x42, 8x42 binoculars), and 416% more light than 22mm objective (such as ordinary, 10x22). Collect more light To provide a brighter view.
【Powerful 12x50 binoculars, only 1.378 pounds for adults】The 12x50mm binoculars weigh only 625 grams and can provide a large field of view of 437 feet/1000 yards. The perfect binoculars, suitable for bird watching, hunting and sports events. Binoculars with adjustable eye cups, suitable for glasses wearers..
【Binocular new mobile phone adapter, enjoy taking pictures】 Quick alignment, compatible with mobile phone case, portable and stable. Suitable for iPhone X, 8P, 8, 7P, 7, 6, 6s, 6P, 5, 5s, Samsung GALAXY S8, S7, S6, S6 Edge, S5, Note, Huawei, LG, HTC, Sony, etc..

PLEASE NOTE: For optimum fit, carefully measure the OUTSIDE DIAMETER of both your rifle scope?s eyepiece and objective bell. Please note that this measurement is different than the diameter of your objective lens..
HIGH QUALITY MATERIAL: high quality material.The Dustproof Cover is made of high quality material Rubber,that will be durable and lightweight to carry..
FEATURES:Can protect ocular or objective lens from damaging or fracturing.Efficient to prevent dirt or dust to enter, and keep your lens clean when not use..
If you have any questions, please contact us, we will solve it for you within 24 hours, please rest assured to buy!.

Rubberized flip-up rifle scope lens covers that conform tightly around your rifle scope tube, protecting your lenses from dust and abrasion.
IMPORTANT: Sizing is not based on the objective lens size of your scope – a 3-9x40mm scope will not fit with a 40mm sized lens cover. For the correct fitting lens cover, you must physically measure the outside diameter of your scope eyepiece and objective..
Each package includes one Rubberized Flip-Up Lens Cover.
Spring-loaded flip-up mechanism pops open effortlessly when needed and securely tightly when not in use.
Please refer to sizing chart and sizing video, carefully measuring the OUTSIDE diameter of your scope, to ensure the proper size and fit..

This brand new 100X (spring, oil) Achromatic microscope objective lens fits common size (DIN/JIS standard) compound microscopes.

This brand new 40X (spring) Achromatic microscope objective lens fits common size (DIN/JIS standard) compound microscopes.

Includes thumbscrew flattop adapter, AA battery, lens pen, lanyard assembly for adjuster and battery cap, logo sticker, manual, and warranty card.
4x magnification with a 35mm objective lens.

Includes thumbscrew flattop adapter, AA battery, lens pen, lanyard assembly for adjuster and battery cap, logo sticker, manual, and warranty card.
4x magnification with a 35mm objective lens.

High-aperture waterproof monocular with 10x magnification and a 50mm objective lens.
Multi-coated BaK-4 glass optics deliver a saturated and contrast image.
large 50mm objective lens gathers much light and ensures great visibility even in twilight.
Waterproof shell is impervious to rain and snow.
nitrogen filling protects the optical elements from fogging.
Long eye relief is convenient for observing in regular glasses or sunglasses.
eyepiece and objective lens protective caps.

Wide-field waterproof monocular with 8x magnification and a 42mm objective lens.
Multi-coated BaK-4 glass optics deliver a saturated and contrast image.
42mm objective lens gathers much light and ensures great visibility even in twilight.
Waterproof shell is impervious to rain and snow.
nitrogen filling protects the optical elements from fogging.
Long eye relief is convenient for observing in regular glasses or sunglasses.
eyepiece and objective lens protective caps.