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A long telephoto lens brings you close optically when you can’t get close physically. Distance shrinks between you and your subject, allowing you to capture both far away and close-up images on film.

Most Celestron spotting scopes are designed to be dual purpose visual and photographic instruments. For photographic use, all that’s required is a T-Adapter for the spotting scope and the correct T-ring for your particular 35mm SLR camera. With these two simple, inexpensive accessories the usability of your spotting scope is easily enhanced.

The criteria given to consider in choosing a spotting scope applies equally well when choosing a telephoto lens.
What’s the difference between a regular scope and an ED scope?

ED means extra-low dispersion and refers to the composition and optical properties of the glass used for the lenses.

ED glass is specially formulated including rare-earth compounds to greatly reduce chromatic aberration (colors not all coming to the same focal plane) compared to standard crown and flint glasses.

Besides getting rid of color fringes, ED glass scopes also yield sharper images because the fringes are no longer present to soften the focus.

EDF glass scopes have an ED glass element using fluorite, giving it even better performance, color-fringe free across the visible spectrum.

Coated, fully-coated, multicoated, fully-multicoated optics. Why are these important?

Optical coatings reduce internal light loss and glare and ensure even light transmission, resulting in greater image sharpness and contrast. Spotting scopes have numerous glass surfaces, each one contributing to scattered light, so coatings make a big difference in what you see. Coated optics will have a less shiny, even dark appearance when looking into the barrel or tube. You may see a greenish, bluish or brownish tint as well. Most coatings are magnesium fluoride or calcium fluoride and work by destructively interfering with certain colors or wavelengths of light, eliminating their reflection. More light gets into your scope and more light is able to pass through to your eyes.  Almost all modern consumer optics have some kind of coating on most of the optical elements. However, there are different levels and qualities of coatings.

Coated optics means that at least one of the major optical elements has a coating on at least one surface. Fully-coated means that all lenses and glass surfaces have a coating layer. Multicoated means that at least one of the major optical elements in a fully-coated scope has multiple coatings of antireflective compounds on at least one surface. Fully-multicoated means all glass surfaces have multiple coatings and it is the best kind, resulting in light transmission of 90-95 percent, bright, sharp and contrasty images.
What are lens shades and dew shields? Why do I need one?

Using your spotting scope in bright lighting conditions may result in a view that has glare or flares from sources of light in the direction you’re looking.

A lens shade acts as a tube extension of several inches to do just that - provide shade from the distracting light that’s ruining your view. Most scopes will have at least an inch-sized length of the main tube extending beyond the lens. Some larger-aperture spotting scopes will have fixed lens shades that are much longer. Retractable shades save space and are found on Celestron’s Mini 50 Zoom and the Onyx 80EDF. Just pull these gently forwards to shade your scope.

Under conditions of cool temperatures or cool optics and high humidity, any lens shade will also prevent dewing on the lens of your scope. In this case, your lens shade acts as a dew shield or dew cap. The longer your dew shield is, the longer your lens will remain unfogged.

The standard visual back on my Schmidt-Cassegrain telescope (SCT) has threads on the outside of the barrel. What are these threads for?

These threads can be used to fit accessories that thread onto the C90 (both old and new), C130 and NexStar 4SE scopes. They also fit similarly threaded accessories from other manufacturers.

For example, you can use the 45-degree diagonal that comes with the C90 on any one of our SCTs when equipped with the standard visual back.
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Celestron Spotting Scopes
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C65 Mini MakC65 Mini Mak
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C50 Mini Mak - WaterProofC50 Mini Mak - WaterProof
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Ultima 65 - Straight spotting scopeUltima 65 - Straight spotting scope
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Ultima 80 - Straight Refractor Spotting ScopeUltima 80 - Straight Refractor Spotting Scope
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102mm Wide View102mm Wide View
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Ultima 80ED - 45°Ultima 80ED - 45°
Celestron C5 Spotting ScopeCelestron C5 Spotting Scope
Ultima 100ED - 45°Ultima 100ED - 45°
Celestron Spotting Scopes

We only offer spotting scopes that are manufactured to meet our rigorous and uncompromising standards. Celestron optical instruments deliver excellent resolution and contrast. Our spotting scopes combine the highest quality precision optics and the most modern, user-oriented design features to produce visual instruments that perform exquisitely year after year.

Celestron sport optics products offer versatility in viewing any subject of interest to you, be it a sporting event, wildlife, bird watching, scenic views in nature, travel, sailing — even the far reaches of the night sky. Inherent in the design of all of these products is our mission to provide the highest quality optical products at a competitive price.

No-Fault Warranty on Select Spotting Scopes

Celestron is proud to offer the most comprehensive No fault Lifetime Warranty to our most popular spotting scope models. Our No fault Lifetime Warranty was previously reserved only for our most expensive binocular products, but as a demonstration of the confidence we have in our products, we decided to apply this exclusive warranty to our entire binocular line and select Celestron spotting scopes as well. There isn’t another manufacturer in this industry who offers this type of warranty to such a broad range of products.

The No-Fault provision of the warranty means that regardless of how the binocular or spotting scope may have been damaged or rendered unusable (fully or partially) by the owner of the binocular or spotting scope, Celestron will repair or replace the product without any questions asked*. The No-Fault warranty will apply to all Ultima spotting scopes, the C65 mini mak models, the Mini 50mm Zoom models and the Pro Zoom model. All other spotting scopes feature a limited lifetime warranty.
Will my spotting scope let me see bullet holes in targets on a shooting range?

Whether or not your spotter will be able to clearly see or resolve a bullet hole in a distant target depends on the size of the bullet, the size of hole it makes and the range to the target. These numbers are used to calculate the angular size of the bullet hole. Then you can compare the angular size to the resolving power of your scope to see if it’s adequate.

First, we’ll assume the bullet hole is the same size as the bullet. The holes are often larger, so this is a conservative assumption.

If necessary, convert hole size and range to inches.

To calculate the angular size of the bullet hole, divide the size of the bullet hole by the range. Multiply the result by 206,265. The number you get will be the angular size in arc-seconds of the hole as seen from the shooting line.

Compare this number to the following chart to find out which scope is best for your target spotting.


Scope diameter
cLEAR Resolution
50 3.7
60 3.1
65 2.8
70 2.6
80 2.3
90 2.1
100 1.9
130 1.4

Example: a 50-caliber bullet hole in a target at 1000 yards. What size scope is the smallest I can use to spot this hole?

1000 yards equals 1000x3x12 or 36,000 inches. 0.50 divided by 36000 is 0.0000138.

0.0000138 x 206265 = 2.8 arc-seconds

A 65mm scope will clearly resolve 2.8 arc-seconds. So you would need at least a 65mm objective size spotting scope to see your shot.

Other factors affecting your ability to see the bullet hole are air quality, steadiness of the air and lighting conditions.
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Information on this page courtesy Celestron’s web site celestron.com
For all international order please email for S&H fees - Celestron Products can only be shipped within the USA
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