Sky-Watcher · Refractor · Up to 4 inches · Now discontinued (replaced by the Esprit 100EDX)
Sky-Watcher Esprit 100ED
The Esprit 100ED is Sky-Watcher's 100 mm triplet apochromat for astrophotography. It's a 550 mm f/5.5 with an FPL-53 ED element in an air-spaced triplet, and it came as a complete imaging kit: a separate two-element field flattener for a flat 40 mm image circle, a camera adapter, tube rings on a Losmandy-style dovetail, a right-angle finder, a 2-inch diagonal and a padded hard case. The flattener needs 63 mm of back focus, which the supplied rings give a DSLR. The dual-speed rack-and-pinion focuser carries a camera without slipping. With accessories it weighs 16 lb, so it needs a solid equatorial mount. Sky-Watcher has since replaced it with the Esprit 100EDX, which makes the original a used buy.
Esprit 100EDEsprit 100EDX (newer replacement)Esprit 80, 120 and 150 (other sizes)
Spec at a glance
- Brand
- Sky-Watcher
- Type
- Refractor
- Made
- Now discontinued (replaced by the Esprit 100EDX)
- Aperture
- 100 mm (4 in)
- Focal length
- 550 mm
- Focal ratio
- f/5.5
- Design
- Air-spaced triplet apochromat with an FPL-53 ED element
- Flattener
- Separate 2-element flattener, included; 63 mm back focus
- Focuser
- Dual-speed rack and pinion
- Weight
- 16 lb with accessories
- Also listed as
- Esprit 100, SW Esprit 100ED, Sky-Watcher Esprit 100
- Typical eBay ask (Oct 14, 2026)
- $3,125–$3,150
The full kit
What should come with it
- Field flattener and its spacer
- Camera adapter (M48 or T-ring)
- Tube rings and a Losmandy-style dovetail
- Right-angle finder
- 2-inch diagonal
- Padded hard case
Check the listing photos against this list, and ask the seller about anything you can’t see. Plenty of listings are the tube alone or the mount alone, and a missing hand controller, power supply or counterweight should come off the price.
What to check
The flattener, spacers and camera adapter are small separate parts that go missing, and without them the field isn't flat for a camera. The lens needs the usual check for haze. A 16 lb tube needs a stronger mount than many expect.
- 01Flattener: Check the field flattener and its spacer are in the photos. They're what makes the stars sharp to the corners.
- 02Lens: Ask for a photo into the objective with a flashlight from the side. It should be clear, with no haze or fungus.
- 03Focuser: Ask the seller to rack the focuser with a camera attached. It should hold its position without slipping.
- 04Kit: Look for the rings, dovetail, finder, diagonal and hard case. A complete kit saves a lot of hunting.
- 05Model: Check whether it's the 100ED or the newer 100EDX. The listing and the tube markings should agree.
- 06Mount: Make sure your mount can carry 16 lb plus a camera. Leave plenty of room for photography.
New to used telescopes? How to check a used telescope covers optics, mounts, power and shipping, and what a complete kit looks like helps with tube-only and mount-only listings.
Buying guide
Which one to buy
§ Oct 14, 2026Only one Esprit is listed, a Polish seller's "Esprit 100mm F/5 OTA" at $3,133 delivered, so the band is this one listing and not a market read. The title's f/5 doesn't match the 100ED's f/5.5, it names neither ED nor EDX, and the photo is a stock shot, so ask which model it is and for a photo of the tube markings before you buy. The 100ED came as an imaging kit, so check the field flattener and its spacer, the camera adapter, rings and dovetail are included, since without the flattener the stars won't be sharp to the corners. Expect longer shipping and possible import fees from Poland, and remember the tube weighs 16 lb with accessories, so it needs a solid equatorial mount.
- Listed now
- 1
- For parts
- 0
- Typical ask
- $3,125–$3,150
- Full range
- $3,021–$3,021
Snapshot
For sale on eBay
1 of 1 listedChecked . Some may have sold.
Delivered prices include shipping as eBay quoted it to a US address on Oct 14, 2026. Many sellers charge by distance, so your total may differ. eBay shows yours before you pay.
Used- Check the seller
5901691601802 Skywatcher Esprit 100mm F/5 OTA Sky-Watcher
$3,133.12est. delivered
$3,021.14 + $111.98 shipping
Buy It Now$3,021.14
Check the seller
Titled 100mm F/5, which isn't the 100ED's f/5.5, and names neither ED nor EDX. Stock photo. Ships from Poland.
Seller: katomixshop
98.9% positive
Prices change daily. The live eBay search shows everything listed now, including anything new since Oct 14, 2026.
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