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Diagram Reports

Hardware Parts

Code Name	Image	Quantity	Usage
M4K12/10		2	Secure the guider to the handlebar

Adaption Guide

graph LR

A(Focuser) -.->M54(M54 → 2” Visual Back) ===>2Dig(<img src='https://williamoptics.com/cdn/shop/files/DIG2-90-1.jpg'>2” Diagonal)
==>2E(<img src='https://williamoptics.com/cdn/shop/files/E-SWA40-1.jpg'>2” Eyepiece)

M54 -.-> 2(2” → 1.25” Visual Back) ==> 1Dig(<img src='https://williamoptics.com/cdn/shop/files/DIG125-90-1.jpg'>1.25” Diagonal)
==>1E(1.25”Eyepiece)

A ==> subgraph1==> T & AC

F61A(<img src='https://williamoptics.com/cdn/shop/files/P-FLAT61A-2.jpg'>Flat 61A<br>1.0x)
F61R(<img src='https://williamoptics.com/cdn/shop/files/P-FLAT73R-2.jpg'>Flat 61R<br>0.8x)
T(<img src='https://williamoptics.com/cdn/shop/files/TM-NK-F-M48-1.jpg'>T-Mount)==>C(Camera)
AC(Astro-Camera)

subgraph subgraph1 [M48 Flattener]
F61A
F61R
end

click 2Dig "https://williamoptics.com/products/dura-bright-2-90-dielectric-diagonal"
click 1Dig "https://williamoptics.com/products/dura-bright-125-90-dielectric-diagonal"
click F61A "https://williamoptics.com/products/flat61A"
click 2E "https://williamoptics.com/products/swan-40mm-2-eyepiece"
click 1E "https://williamoptics.com/collections/eye-pieces"
click T "https://williamoptics.com/collections/adapters"

Operation Guide

Flattener Back Focus Adjustment

1. Find the recommended back focus adjustment distance for your flattener.

ㅤ	Back Focus	Adjust Distance	Image Circle
Flat 61A	67.7 mm	12.9 mm	∅ 43 mm
Flat 61R	56 mm	1 mm	∅ 43 mm

1. No matter how complicated the structure of the front part is, please find the back adapter connected to the camera.

1. If your setup requires additional back extender, please remove the original part and install the extender.

1. Adjust the back adapter to the required distance.

1. Tighten the ring against the back adapter.

1. Fine Tuning Take a few test shots. According to the aberration pattern of the surrounding star points of your image, you can determine whether to extend or shorten the Flattener back focus.

▲ Camera Sensor Too Close

▲ Camera Sensor Too Far Away

Focuser Tension Adjustment

TOP / Focuser Draw Tube

A. Tension Screws (2.5mm Hex)

B. Quick tension adjustment knob

C. Guider/Finder bracket mounting screws (2.5mm Hex)

BOTTOM / Rack & Pinion Gear

A. Focuser Attachment Screws - Please Don’t Touch

B. R&P Tension Screw

Installing EAF

1. Turn the telescope over and remove the Tension screw.

 

1. Remove the top cover screw near the temperature gauge with 2mm Allen key.

Starting from June 2025, new telescope models no longer include the top cover screw. (Skip Step 2)

 

1. Release (don’t remove) two inner knob screws.

1. Remove the temperature gauge knob.

1. Find the flat side on the shaft and turn it to face the hole.

1. Put the 5-6mm Flexible coupling on the shaft and lock the two inner screws.

1. Put the EAF body on and lock the two inner screws.

On Step 6 & 7:

Please make sure one of the screws is lock on the flat side (D-cut profile)

1. Align the screw holes.

1. Lock the four M4 bracket screws.

Care & Safety Instructions

Solar Safety Warning

Never point your telescope or finder scope at the Sun without a proper solar filter securely mounted to the front of the telescope.

Even a brief, unfiltered glimpse of the Sun can permanently damage your eyes or your camera’s image sensor.

Use only front-mounted solar filters made by trusted manufacturers. These filters must cover the front of the telescope’s dew shield securely.

Do not use solar eyepiece filters. They are unsafe and can fail under sunlight.

With the correct solar filter in place, you can safely observe and photograph the Sun without damaging your eyes, your camera, or your telescope.

Telescope Care & Storage