What is the difference between BaK-4, BK-7 and K9 glass?

There are literally thousands of different formulations of glass in the world. Each formulation has its own very specific optical properties and consequently its own designation. BK-7 and Bak-4 are...

What is the difference between BaK-4, BK-7 and K9 glass?

There are literally thousands of different formulations of glass in the world. Each formulation has its own very specific optical properties and consequently its own designation. BK-7 and Bak-4 are...

Should I use a tripod or a monopod?

Should I use a tripod or a monopod?

A common question regarding tripods and monopods is, “Which one should I use?” The answer is a relatively simple one; however, it requires first answering three other questions first:What optic...

Should I use a tripod or a monopod?

A common question regarding tripods and monopods is, “Which one should I use?” The answer is a relatively simple one; however, it requires first answering three other questions first:What optic...

When should I use a tripod for my binoculars?

At first glance, binoculars seem simple—just pick them up and start observing. But the moment you hold them steady for more than a few minutes, the limitations become clear.Even small...

When should I use a tripod for my binoculars?

At first glance, binoculars seem simple—just pick them up and start observing. But the moment you hold them steady for more than a few minutes, the limitations become clear.Even small...

Does my Spotting Scope accept Astronomical Eyepiece & Filters?

Using Astronomical Eyepieces and Filters with Celestron Spotting ScopesOne of the features that makes Celestron’s Regal M2 ED, TrailSeeker, Hummingbird ED, C90, and C5 spotting scopes much more ver...

Does my Spotting Scope accept Astronomical Eyepiece & Filters?

Using Astronomical Eyepieces and Filters with Celestron Spotting ScopesOne of the features that makes Celestron’s Regal M2 ED, TrailSeeker, Hummingbird ED, C90, and C5 spotting scopes much more ver...

What is a waterproof spotting scope?

Waterproof spotting scopes are designed to totally exclude water from the optical tube. They may be nitrogen purged: filled with dry, inert gas (nitrogen) as an additional barrier to the...

What is a waterproof spotting scope?

Waterproof spotting scopes are designed to totally exclude water from the optical tube. They may be nitrogen purged: filled with dry, inert gas (nitrogen) as an additional barrier to the...

Smartphone Adapter Tension Adjustment Guide

The tension of each axis can be easily adjusted using a small Phillips screwdriver. Use the images below to locate the adjusting screws. For each axis, only make small adjustments...

Smartphone Adapter Tension Adjustment Guide

The tension of each axis can be easily adjusted using a small Phillips screwdriver. Use the images below to locate the adjusting screws. For each axis, only make small adjustments...