Founder Optics FOT86 Triplet APO Refractor
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Founder Optics FOT86 Triplet APO RefractorFounder Optics FOT86 Triplet APO RefractorFounder Optics FOT86 Triplet APO Refractor
Founder Optics FOT86 Triplet APO RefractorFounder Optics FOT86 Triplet APO RefractorFounder Optics FOT86 Triplet APO Refractor

Founder Optics FOT86 Triplet APO Refractor

£1,239.00
  (1 Review)
✓ 2 year warranty

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2x in stock shipped 1-2 working days

About this product

Model:  founder_fot86

Founder Optics FOT86 Triplet Apochromatic Refractor

This premium Triplet APO refractor from Founder Optics was designed in Japan and is manufactured in Taiwan.

The fully Multi-Coated Triplet optics includes two ED glass elements, with a wide air space between each lens.

The FOT86 has outstanding colour and spherical correction. Views and images are sharp and have high contrast.

The FOT86 is machined and assembled to a very high standard at a factory with a long history and good relations with many Japanese brands. 

Every telescope is tested, and an inspection report is included.

The FOT86 features a high-quality 2" Rack and Pinion focuser with two sets of 4 ball bearings between the drawtube and the focuser cover.

Once locked, the focuser drawtube maintains alignment with the optical axis.

Unique Lock Function–  Heavy Loading Capability!

Founders lock design grabs the drawtube in two directions. This design ensures the focuser is always paralleled to the optical axis. 

Max load capacity is 8kg.

The focuser also features a 1:11 Dual Speed focuser– which ensures high precision focusing and 95mm of focus travel, ensuring the FOT86 is very flexible and can accommodate most imaging accessories.

Focuser Rotator - The FOT86 includes a high-precision rotator that ensures collimation stability whilst rotating and allows the user to frame targets. You can also loosen the rotator and focuser knobs for the dual rotator and focuser rotation.

The FOT86 includes a sliding retractable Dew Shield with three locking screws for dew shield stability and alignment.

Includes a Field Flattener with a corrected 44mm image circle and M42 (T) and M48 threads.

What's in the box

1) High Quality Aluminium Case with Key
2) FOT86 Optical Tube with 2" Rack & Pinion Focuser
3) 1.25’’/ 2’’ Twist Lock Adapter
4) Crank Handle with 1pc 1/4"-20 Hexagon Screw
5) Tube Rings with 4pcs Dovetail Screws
6) Finderscope Shoe
7) 7’’ Vixen Type Mounting Dovetail
8) Quality Certification Card with Serial Number
9) Cleaning Cloth
10) Dust Caps (for Objective Lens)​
11) Field Flattener with M42 and M48 Threads

Specifications

Optical System 2 ED APO Triplet (Fully Separated Elements)
Clear Aperture 86mm
Focal Length 560mm/F6.5
Image Circle with Flattener 44mm
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

 

Customer reviews

Average Rating (1 Review):  
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Engineering jewellery
24 August 2024  | 

I have had my Founder FOT86 telescope for a year now, and I decided that somebody ought to sing it praises, because anyone wanting a top quality Apo around this size should give it some serious thought.

I was initially put off buying it because the chunky rings and bright greem anodising made it look rather cheap and child-like on the photos. However, when I got it out of the box I realised how wrong I was. The very high build quality and cosmetic detailing was an eye-opener. It looks, feels, and acts like a top quality item.

I appreciate some small things that you may not think of, such as the handle which has enough room under it to allow large hands to grip it comfortably. The aluminium case that it comes with is very nice and is longer than necessary. Why is that good? Well it allows me to put the scope back in the box without removing the included flattener. In fact, I believe that removing one piece of foam packing I could put it back with a camera in place too. A little work with a scalpel, on the end foam, would be needed but I think it would be possible for a normally sized dedicated astro camera. The case, as it comes, has holes in the foam for some accessories; but you won't need the hole for the flattener if it is attached to the scope. They've thought of everything.

The focuser is fabulous - very smooth with no backlash and a weighty engineered feel to it. The dewshield moves smoothly and stays in place. It is simply well designed and very well put together.

What about optical quality? Well, it's more of the same and yes, of course it gives very sharp images. I have nothing negative to say about it and it seems without any issues that I am aware of. Chromatic aberration is non existent as far as I can see, and star shapes are perfectly round from corner to corner using the supplied flattener. Sorry, I can't think of anything else to say about optical quality. It just is superb. I first inserted the flattener and then a ZWO camera with the micro-four thirds sensor and took some trial shots expecting to see perhaps some tilt issues due to not screwing the flattener drectly onto the scope but no, it was just great. So that is the way it has stayed apart from a trial when I bought the Stellalyra 0.8 reducer/flattener which gave almost identically good results. Maybe, just maybe, the reducer is not quite up to the super high standard set by the 1.0x flattener, but without spending lots of time I cannot say what effect the atmospheric conditions had. I have only used the telescope at its native focal length since then, and the results are always special.

One other thing about the optics is that the included quality chart (inspection report) is for the individual scope and mine was subtly different to the one on FLOs web page. It is not a generic piece of advertising.

In use, it has been a joy. It holds focus with no trouble at all and carrying it in and out on consecutive nights usually results in no need to refocus according my Bahtinov mask. I have not used an electronic focusser. I only use OSC cameras so why bother when it never needs refocussing during the night? The long dew shield is also pretty good at resisting the objective lens frosting up. I have a dew heater but it doesn't get used all that much. Maybe that is because I live in Suffolk, UK, which is generally a pretty dry county.

Are there any negatives? Oh come on, there must be something. Um, well it is fairly long and fairly heavy I suppose, but if Founder believe that makes it a better telescope then that is fine by me.

Clear skies everyone, Neal

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