FS Series Guiding Telescopes / Guide Scope

Introduction

The FS-200AC,AR and FS-250AC,AR Find Scopes are designed to enhance your guiding experience with superior optical performance and robust construction. Perfect for astrophotography and precise tracking, these find scopes are essential for any serious astronomer.

General Characteristics

The optical lens of the FS-200AC,AR/FS-250AC,AR find scope features a two-piece double-glued achromatic structure, ensuring exceptional clarity and minimal distortion. The multi-layer coating process significantly enhances lens transmittance, making these find scopes ideal for low-light conditions.

• FS-200AC:
  • Focal Length: 200mm
  • Diameter: 46mm
  • Focal Ratio: F4.5
• FS-250AC:
  • Focal Length: 250mm
  • Diameter: 46mm
  • Focal Ratio: F5.6

Durable Construction

The barrel of the FS-200AC,AR/FS-250AC,AR find scope is made from high-quality aluminium alloy, CNC machined to ensure both stability and aesthetic appeal. This attention to detail guarantees that your find scope will withstand the rigors of outdoor use.

Focus Mechanism

Choose between two focus seat models:

• FSB-125C (Crayford Focusers): Features precision bearing guidance and gearless focusing for stability during adjustments.
• FSB-125R (Rack and Pinion Focusers): Offers higher focusing accuracy with gear rack and pinion technology.

Both focus seats have a 1.25-inch inner diameter, making them compatible with mainstream guide cameras. An M42x0.75 thread is also included for connecting cooling or planetary cameras.

Convenient Design Features

The focus handwheel features chamfer knurling for both aesthetic appeal and practicality. Additionally, the laser-marked focusing stroke scale allows users to easily find and record focus positions.

Mounting Options

The find scope rings and dovetail plate are crafted from aluminium alloy and CNC machined for durability. The rings feature M5 threaded holes for easy installation of additional astronomical equipment. The dovetail plate includes multiple M6 threaded holes and a 3/8-16 British threaded hole for secure attachment to tripods and other equipment.

Elevate Your Astrophotography

With the FS-200AC,AR and FS-250AC,AR find scopes, you can enhance your guiding precision and take your astrophotography to the next level. Explore the cosmos with confidence and clarity!

Order your FS Series Guiding Telescopes from Dark Clear Skies and enjoy free shipping!

The FS-200AC,AR/FS-250AC,AR find scope rings and dovetail plate are also made of aluminium alloy and CNC machined. The find scope rings have M5 threaded holes on the top and side for easy installation of other astronomical equipment; the dovetail plate has multiple M6 threaded holes and a 3/8-16 British threaded hole at the bottom for connecting to tripods and other equipment.

The physical products of FS-200AC,AR/FS-250AC,AR find scopes are shown in Fig.1 and Fig.2

Figure 1 FS-200 find scope product

Figure 2 FS-250 find scope product

1.2 FS-200AC,AR/FS-250AC,AR Find Scope, Focus Seat Model

The current model parameters of FS-200AC,AR/FS-250AC,AR find scopes are shown in the table below. There are two find scopes with different focal lengths to choose from to meet user needs.

Order Code	Focal Length	Diameter	Focal Ratio	Camera Interface Size	Focus Seat Type
FS-200AC	200mm	45mm	F4.5	1.25 Inch/M42x0.75	Crayford Focusers (With FSB-125C)
FS-200AR					Rack and Pinion Focusers (With FSB-125R)
FS-250AC	250mm	45mm	F5.6	1.25 Inch/M42x0.75	Crayford Focusers (With FSB-125C)
FS-250AR					Rack and Pinion Focusers (With FSB-125R)

Currently, there are two models of focus seats, FSB-125C and FSB-125R, for users to choose from. Their parameters are shown in the following table. FSB-125C adopts gearless focus, while FSB-125R adopts gear focus.

Order Code	Lens Tube Mounting Thread	Camera Interface Size	Focus Stroke	Focus Mode
FSB-125C	M48x0.75	1.25”/M42x0.75	35mm	Crayford Focusers
FSB-125R	M48x0.75	1.25”/M42x0.75	35mm	Rack and Pinion Focusers

1.3 FS-200AC,AR/FS-250AC,AR Find Scope Dimensions

The product dimensions of FS-200AC,AR/FS-250AC,AR series find scopes are shown in Fig.3 to Fig.6.The product dimensions of FS-200AC,AR/FS-250AC,AR find scope focus seats are shown in Fig.7 and Fig.8.

Figure 3 FS-200AC find scope dimensions

Figure 4 FS-200AR find scope dimensions

Figure 5 FS-250AC find scope dimensions

Figure 6 FS-250AR find scope dimensions

Figure 7 Dimensions of FSB -125C gearless focus seat

Figure 8 Dimensions of FSB -125R gear focus seat

2、Installation of FS-200AC,AR/FS-250AC,AR and Guide Camera

The installation method of the FS-200AC,AR/FS-250AC,AR find scope and guide camera is shown in Figure 9 and Figure 10.Insert the guide camera directly into the 1.25-inch interface at the end of the FS-200AC,AR/FS-250AC,AR guide scope, and then tighten the three-point locking screw.

Figure 9 FS-200AC,AR find scope and guide camera

Figure 10 FS-250AC,AR find scope and guide camera

Figure 11 FS-200AC,AR/FS-250AC,AR find scope and telescope system

3、FS-200AC,AR/FS-250AC,AR Find Scope Packing List

Figure 12 FS-200AC,AR find scope packaging diagram

Figure 13 FS-250AC,AR find scope packaging diagram

Standard Packing List
A	Guide scope packaging box specifications: L:32 cm W:11.5cm H:10 cm (FS-200AC,AR:1 pcs, 0.75 kg/box; FS-250AC,AR : 1 pcs, 0.8 kg/box;)
B	FS-200AC,AR/FS-250AC,AR find scope (Including find scope rings/dovetail plate, focus seat optional)
C	Guide scope dust cover

4、Pictures Taken with FS-200AC,AR/FS-250AC,AR and Camera

Figure 14 FS-200AC,AR/FS-250AC,AR with Touptek I3ISPM08300KPA camera to take photos of the lunar surface

Figure 15 FS-200AC,AR/FS-250AC,AR with Touptek I3ISPM08300KPA camera to take photos of buildings