Brand: Founder Optics

Founder Optics FL 560mm F/6.5 Triplet Refractor with 2 ED Glass (FOT86)

FOT86

Brand: Founder Optics

Founder Optics FL 560mm F/6.5 Triplet Refractor with 2 ED Glass (FOT86)

FOT86

Top shelf design and materials make for an incredible refractor and an even more incredible price.
  • Optical System: 2 ED APO Triplet (Fully Separated Elements)
  • Clear Aperture: 86mm
  • Focal Length: 560mm
  • Image Circle (with Field Flattener): Ø44mm
  • Focuser: 2’’ Rack & Pinion Patented Focuser (Twist Lock)
  • Weight: OTA: 3.5kg/ with Tube Ring: 4.6kg
  • Diameter of Main Tube: 90mm
  • Tube Length: Fully Retracted: 456mm/ Fully Extended: 545mm
8% OFF Special Order
$1,282.00 USD
Save: $110.00

Easy Payment Options with .

How do I Special Order?
8% OFF Special Order
$1,282.00 USD
Save: $110.00

Easy Payment Options with .

How do I Special Order?
Free Expert Support
Stress Free, Secure Shopping
30 Day Return Policy
Price Match Promise

Recommended Accessories

Why We Love It Full Details What Can I See? What's in the Box? Specifications Reviews and Questions Articles, Videos, Software, Links

Why we love the Founder Optics FL 560mm F/6.5 Triplet Refractor with 2 ED Glass (FOT86)

Founder Optics have brought a premium air-spaced triplet refractor using top shelf materials to an impressive price point. The quality of these optical tubes shows in the eyepiece and in your images. We have no hesitation recommending the FOT86, it's a seriously good scope for visual astronomy and astrophotography.

Product Description

Design

This is an excellent performance 3-element ED APO triplet refractor designed by famous optical designer in Japan, who is a legendary designer in the Astronomy industry. The optical performance is impressive as we use 2ED glasses.

Unlike most of ED triplet which use only 1 ED glass element, we adopted 2 ED glass of S-FPL 53 and S-FPL 51 to bring a remarkable image to your eyes. With two fluoro-crown ED glass elements and fully multi-coated optics, the refractors provides a crystal clear, superb sharp, zero aberration and distortion.

Besides the lens, we use a unique design- each element is fully separated which is different from other triplet lenses.

Quality

In order to complete this unique design, it requires a very high level machining and assembly capability. We work with a 50 years optical factory located in Taiwan. This factory has a long history and keep a good partnership with many Japan famous brands. This factory known for a precisely machining capability and high technical assembly skill. Their producing know-how create accomplishment.

Besides, not only the production process, the high standard of quality control is also crucial to make FOT86 and FOT106 successfully — Quality Certification Card.

We test every unit and create this card to make customer understand the quality customer purchased. By doing so, customer can be confident with our quality and also mean we treat every unit as a delicate product not just commercial product. We are very serious to provide the best triplet to the end user.

Inspection Report

Focuser - 2" Rack & Pinion

Perfect Hybrid Drive system with 8 Ball bearings- More Smoothly!

2sets of 4pcs ball bearing at 2 sides between the drawtube and the focuser cover travel linearly. After locked the knob, there is no gap among the drawtube, 8pcs ball bearings, and the focuser cover. It does not only keep the focuser always paralleled the optic axis, but also keep it moved very smoothly.

Dual Speed Focuser- 1:11 – Extremely Accurate!

Smooth focus motion and fine focus wheel allow precision adjustment from critical focusing of eyepiece or camera.

Unique Lock Function– Heavy Loading Capability!

Special lock grabs the rack&pinion & drawtube in two direction. The design makes the focuser always paralleled the optics axis. Instead of pushing against the drawtube to eliminate focus shift while it’s focused. It’s totally breaking the traditional single point fixed design in the market. And can handle up to 8kg.

Longer Traveling Distance– Flexible for Photographing Accessories!

Unlike other focuser, longer traveling distance 95mm provide more room for adjust focus. This is very flexible for some applications.

Suit for variety photographing accessories to adjust the focuser to gain the best image. Friendly Use!

FOT86 Focuser

Stable Dew Shield Fixing

Smoothly slide the dew shield. Three fixing screws hold dew shield well to avoid the spinning or moving while shooting to make sure you can capture the best image. Also, three screws prevents the dew shield falling when carry telescope.

Dew Shield

What can I see with a Founder Optics FL 560mm F/6.5 Triplet Refractor with 2 ED Glass (FOT86)?

Here are some simulated views of common objects. Results with your telescope will vary with viewing conditions, obrits, equipment and more.

Jupiter with

25mm Eyepiece - 22x Magnification

(Sold Separately)

Jupiter with

10mm Eyepiece - 56x Magnification

Sold Separately

Jupiter with

5mm Eyepiece - 112x Magnification

Sold Separately

Moon with 25mm Eyepiece

22x Magnification

(Sold Separately)

Moon with 10mm Eyepiece

56x Magnification

Sold Separately

Moon with 5mm Eyepiece

112x Magnification

Sold Separately

Andromeda with 36mm Eyepiece

16x Magnification

Sold Separately

Andromeda with 25mm Eyepiece

22x Magnification

(Sold Separately)

Andromeda with 10mm Eyepiece

56x Magnification

Sold Separately

What's in the Box

  • High Quality Aluminum Case with Key
  • FOT86 with Patent Rack & Pinion Focuser
  • 1.25"/2" Twist Lock Adapter
  • Crank Handle with 1pc 1/4"-20 Hexagon Screw
  • Tube Rings with 4pcs Dovetail Screws
  • Star Finder Shoe
  • Field Flattener (M42) with Exchangeable M48 Adapter
  • 7" Vixen Type Mount Dovetail
  • Quality Certification Card with Serial Number
  • Cleaning Cloth
  • Dust Caps (for Objective Lens)

Specifications

Optical System 2 ED APO Triplet (3-elements Fully Separated Triplet)
Clear Aperture 86mm
Focal Length 560mm
Focal Rate f/6.5
Image Circle (with Field Flattener) Ø44mm
Focuser 2" Rack & Pinion Patented Focuser (Twist Lock)
Weight OTA: 3.5kg/ with Tube Ring: 4.6kg
Diameter of Main Tube 90mm
Tube Length Fully Retracted: 456mm / Fully Extended: 545mm


Distortion with FF

Field Curvature

Spot Diagram with FF

Spot Diagram

Customer Reviews

Be the first to write a review
0%
(0)
0%
(0)
0%
(0)
0%
(0)
0%
(0)

Why Should You Trust All Star Telescope?

We've Made All The Mistakes
So You Don't Have To

Learn More