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Explore Scientific 102mm f/7 Carbon Fiber FCD100 ED Triplet Refractor

Regular Price: $1,949.99

Special Price $1,559.99

Availability: In stock

This 102mm (4") Explore Scientific Carbon Fiber air-spaced ED triplet apochromatic refractor is loaded with quality optical performance at a surprisingly reasonable price for a scope of its size and optical quality.
Our Product #: ES102CFFCD
Explore Scientific Product #: FCD100-10207-CF
Recommended Accessories
 

Product Description

This 4" Explore Scientific ES102 "Carbon Fiber" apochromatic refractor has:
102mm f/7 fully multicoated triplet optics using Premium Hoya FPL53-equivalent FCD100 ED element in a Carbon Fiber Body 
Dual-speed 2.5" Hexagonal focuser with 10:1 ratio fine focusing
Mounting rings with dovetail for use on a Vixen-style altazimuth or German equatorial mount
Finderscope base installed on OTA
Extended product lifetime warranty

The Explore Scientific 4" (102mm) aperture "Carbon Fiber" ES102 ED triplet refractor uses a premium Hoya FCD100 ED glass element and state-of-the-art optical multicoatings in its apochromatic air-spaced ED triplet optics. The result is images that are essentially free of the annoying halo of unfocused violet light (chromatic aberration) that mars the view of bright stars and solar system objects in lesser scopes, despite the scope's relatively large aperture, and even at very high magnifications.

The Explore Scientific ES102 is a natural on an equatorial mount as the heart of your primary observing system. In addition, it's an excellent astrograph for serious wide field imaging, as well as crisp solar system imaging. Considering its lifetime warranty, its surprisingly reasonable price for a 4" apochromatic triplet, and in view of the great optical performance that comes as standard equipment, the 4" Explore Scientific ES102 is a terrific buy!

Features of this Telescope . . .

ED triplet refractor optics: 102mm (4") aperture, 714mm focal length, f/7 focal ratio three-lens air-spaced optical system. The optics use a center lens element of Hoya FCD100 (Dense Fluor Crown) glass, the Hoya equivalent of FPL-53 ED (Extra-low Dispersion) glass. This ED element produces superior sharpness and color correction by minimizing the chromatic aberration, the "false" color fringing seen around bright objects when light rays pass through standard crown-and-flint doublet objectives, particularly those with apertures in the ES102 class. Relying on technological innovation, Explore Scientific has successfully launched the mass production of high-performance optical glass at the apex of the FCD family. Combining it with optical glass of high refractive index allows them to achieve unprecedented advanced chromatic aberration correction. Hoya FCD100 is considered the best glass ever produced by Hoya.

Fully multicoated optics: The ES102 triplet objective lens has EMD™ (Enhanced Multilayer Deposition) antireflection multicoatings on all air-to-glass surfaces for high light transmission, minimal light scatter, and excellent contrast.

Carbon fiber body: The body and dew shield of the 127mm Explore Scientific are made of woven carbon fiber fabric, encapsulated in epoxy. Carbon fiber, the same material used to fabricate much of the fuselage and wings of the new Boeing 787 Dreamliner passenger jet, has a high strength-to-weight ratio to keep the scope almost 20% lighter than comparable aperture aluminum-body scopes. In addition, it has low thermal expansion characteristics when subjected to temperature variations. This helps to keep the instrument sharply focused as the ambient temperature changes, which is particularly important during critical long-exposure CCD imaging.

Internal light baffles: The aluminum tube body has contrast-enhancing internal light baffles and a specially darkened tube interior to provide dark sky backgrounds and high contrast.

Collimatable optics: One of the bonuses of owning a refractor is that, compared to standard reflector telescopes, they almost never require realigning of the optics (collimation). However, any air-spaced refractor telescope may require optical recentering if the lens elements are knocked out of alignment by a heavy blow during shipping or use. Removing the dew shield will give you access to the lens centering screws in the sides of the lens cell, which you can then adjust yourself by referring to the supplied instructions. You can also send your scope to Explore Scientific's Service Center for precision alignment. A standard service charge applies for factory realignment.

Dew shield: The supplied dew shield slows the formation of dew on the lens in cold weather to extend your undisturbed observing time. It also improves the contrast, similar to the effect of the lens shade on a camera lens, when observing during the day or when there is excessive ambient light at night, such as a neighbor's backyard security light. A slip-on metal dust cap is standard.

Dual speed 2.5" Hexagonal focuser: The rotating precision-made no-backlash focuser has dual-speed focusing. There are two coarse focusing knobs. The right knob also has a smaller concentric knob with a 10:1 reduction gear microfine focusing ratio. This provides exceptionally precise image control during high magnification visual observing and critical DSLR or CCD imaging. The large focus knobs have ribbed gripping surfaces so they are easy to operate, even while wearing gloves or mittens in cold weather.

The focuser drawtube has a scale marked in centimeters and 1mm increments. This lets you note individual focuser positions for easy return to the correct focus when switching between visual use and photography. Lock knobs let you adjust the tension on the drawtube to accommodate varying eyepiece/photo accessory loads, as well as firmly lock in a photographic focus. The focuser terminates in a non-marring 2" compression ring accessory holder. Two 2" draw tube extensions are included to let adjust the back focus when using a diagonal and eyepieces versus a camera.

Mounting rings and dovetail: The ES102 has dual split mounting rings with a dovetail plate that fits the Vixen-style dovetail slot on the head of many of the most popular medium capacity German equatorial mounts. Such mounts include go-to mounts from Celestron and iOptron, among others. A spacer/stabilizing bar on the top of the rings provides a carrying handle that makes it easy to transport the optical tube and install it on your equatorial mount. There is a mounting shoe for an optional finderscope installed on the body of the scope.

Extended lifetime warranty: This individually serial numbered Explore Scientific telescope is backed by a limited one year warranty, which will be extended to an Explore Scientific transferable Life of the Product limited warranty when its warranty card is registered with Explore Scientific within 60 days of purchase.

Tech Details

Aperture 4"
Binary and Star Cluster Observation Very Good
Focal Length 714mm
Focal Ratio f/7
Galaxy and Nebula Observation Fair
Highest Useful Magnification 204x
Lunar Observation Great
Weight 11 lbs.
Planetary Observation Very Good
Resolution 1.14 arc seconds
Telescope Type Refractor
Visual Limiting Magnitude 12.5
Warranty 1 year, extendable to lifetime

Reviews

Review by:
I have owned the Explore Scientific ED 102 CF for a while now. All I can say is WOW! This is an amazing telescope. The 714mm focal length allows for some fairly wide-field shots. Paired with a .8 or .6 reducer, the field can become even wider! For astrophotography, the carbon fiber optical tube is lightweight when compared to the aluminum optical tube. This makes balancing easier and it can be used on smaller, entry level mounts with lower weight limits. I would highly recommend this to anyone looking to get into astrophotography or even for some casual observing. (Posted on 7/24/2019)
Review by:
I learned about this refractor from the Astrobackyard website. I wanted to be able to get images like those shown on the website using this telescope and I was not disappointed. It is light, gets a crisp clear focus and holds it. This was my first telescope, but I don't I will ever give it up. (Posted on 12/7/2018)
Review by:
I have looked thru a number of ES scopes both carbon fiber and Aluminum. I was really floored at the clarity these copes provide for visual. I almost bought the carbon fiber version for AP, but wanted a faster focal ratio. I have a friend that images with both the 127mm essential series and an 80mm FCD100. Both provided excellent views and images. I have been impressed with all the ES scopes, although I cant vouch for the Achromatic scopes as I haven't had access to one. If you're doing Astrophotography, at 11lbs, the OTA of the 102mm is light enough to perform well with most mounts. CF Scopes are also less susceptible to temperature changes. I own an Carbon Fiber ES 115mm f5.5 FPL-53 scope and couldn't be happier with it. Truly a Dream Scope. I only got the 115mm because I wanted the fast f5.5 focal ratio). Use the ES flattener or the Hotec Self Centering fattener if you want faster/flatter Images. Fine optics, Light weight, Great price. You wont be disappointed!! (Posted on 11/30/2018)
Review by:
I have looked thru a number of ES scopes both carbon fiber and Aluminum. I was really floored at the clarity these copes provide for visual. I almost bought the carbon fiber version for AP, but wanted a faster focal ratio. I have a friend that images with both the 127mm essential series and an 80mm FCD100. Both provided excellent views and images. I have been impressed with all the ES scopes, although I cant vouch for the Achromatic scopes as I haven't had access to one. If you're doing Astrophotography, at 11lbs, the OTA of the 102mm is light enough to perform well with most mounts. CF Scopes are also less susceptible to temperature changes. I own an Carbon Fiber ES 115mm f5.5 FPL-53 scope and couldn't be happier with it. Truly a Dream Scope. I only got the 115mm because I wanted the fast f5.5 focal ratio). Use the ES flattener or the Hotec Self Centering fattener if you want faster/flatter Images. Fine optics, Light weight, Great price. You wont be disappointed!! (Posted on 11/30/2018)
Review by:
I have looked thru a number of ES scopes both carbon fiber and Aluminum. If you're doing Astrophotography, the light weight of these carbon fiber OTAs are far better than the aluminum counterparts to minimize the total weight on the mount. They are also less susceptible to temperature changes. I own an ES 115mm f5.5 FPL-53 scope and couldn't be happier with it. These FCD100 scopes provide views and images that are imperceptible to the FPL-53 scopes costing more (I only got the 115mm because I wanted the fast f5.5 focal ratio). My focus is AP, so aberration is a big concern. The FCD100 series really perform. I image with a friend who owns the FCD1 & FCD100 Scopes. A similar scope would cost thousands more from some manufacturers. Fine optics, Light weight, Great price. You wont be disappointed!! (Posted on 11/29/2018)
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Supplied Accessories

Cradle Ring with Handle and Vixen Style Dovetail Plate; Explore Finder Scope Base installed on scope; 99% Reflective 2" Diagonal