Starlight Instruments Feather Touch® 3.5"/DTT 4.5"

Starting Price: $960.00
Price as Configured: $960.00
Brand: Starlight Instruments / SKU: SI-FTF3545B-A
Feather Touch® 3.5″ Diameter Dual Speed Telescope Focuser Kit, 4.5″ DTT, and Brake. The telescope must have at least 4.35″ of clearance for the draw tube to go inside of the telescope, if not the draw tube will “bottom-out” and give you more back focus.

Choose an adapter, end cap, and mounting bracket from the "Add-ons and Accessories" below.
View Add-ons and Accessories

Recommended Add-ons and Accessories

Enter the quantity desired for each item and click the close button to continue with your purchase.
SI-A35-503-WOFLT178 - Starlight Instruments Adapter 3.5" for William Optics FLT178
SI-A35-503-WOFLT178 - Starlight Instruments Adapter 3.5" for William Optics FLT178
$270.00
« Back to All Add-ons
SI-A35-503-WOFLT178 - Starlight Instruments Adapter 3.5" for William Optics FLT178
About This Product
Scope specific tube adapter to attach 3.5″ Feather Touch focuser to the William Optics FLT178 telescope

Use with focuser FTF3545B-A
SI-FSB-4553 - Starlight Instruments Finder Scope Bracket 45-53mm Sleeve
SI-FSB-4553 - Starlight Instruments Finder Scope Bracket 45-53mm Sleeve
$250.00
SI-FSB-5060 - Starlight Instruments Finder Scope Bracket 50-60mm Sleeve
SI-FSB-5060 - Starlight Instruments Finder Scope Bracket 50-60mm Sleeve
$270.00
SI-FSB-CH4055 - Starlight Instruments Finder Scope Bracket for 40-55mm Finder Scope
SI-FSB-CH4055 - Starlight Instruments Finder Scope Bracket for 40-55mm Finder Scope
$190.00
SI-FSB-CHRDF - Starlight Instruments Finder Scope Bracket with Red Dot Finder
SI-FSB-CHRDF - Starlight Instruments Finder Scope Bracket with Red Dot Finder
$270.00
SI-A35-503-WOFLT132 - Starlight Instruments Adapter 3.5" for William Optics FLT132/TS Photoline F7
SI-A35-503-WOFLT132 - Starlight Instruments Adapter 3.5" for William Optics FLT132/TS Photoline F7
$250.00
« Back to All Add-ons
SI-A35-503-WOFLT132 - Starlight Instruments Adapter 3.5" for William Optics FLT132/TS Photoline F7
About This Product
Scope specific tube adapter to attach 3.5″ Feather Touch focuser onto William Optics FLT132/Teleskop Service Photoline F7 telescopes

Use with focuser FTF3545B-A
SI-EC35-505-1 - Starlight Instruments End Cap 3.5" for Takahashi Large Field Flattener
SI-EC35-505-1 - Starlight Instruments End Cap 3.5" for Takahashi Large Field Flattener
$160.00
« Back to All Add-ons
SI-EC35-505-1 - Starlight Instruments End Cap 3.5" for Takahashi Large Field Flattener
About This Product
This 3.5" End Cap fits the 3.5" Feather Touch focusers for Takahashi TOA645/TOA67 large flatteners.
SI-EC35-505-11 - Starlight Instruments End Cap 3.5" for William Optics
SI-EC35-505-11 - Starlight Instruments End Cap 3.5" for William Optics
$160.00
« Back to All Add-ons
SI-EC35-505-11 - Starlight Instruments End Cap 3.5" for William Optics
About This Product
This 3.5″ End Cap fits the 3.5″ Feather Touch focusers for William Optics Male Threaded Accessories.

SI-EC35-505-12 - Starlight Instruments End Cap 3.5" for SBIG and FLI 5 Series/CCD Camera & Filter Wheels
SI-EC35-505-12 - Starlight Instruments End Cap 3.5" for SBIG and FLI 5 Series/CCD Camera & Filter Wheels
$190.00
« Back to All Add-ons
SI-EC35-505-12 - Starlight Instruments End Cap 3.5" for SBIG and FLI 5 Series/CCD Camera & Filter Wheels
About This Product
This End Cap fits the 3.5″ Feather Touch focusers and has 3.0x24tpi male threads which are used to attach SBIG STXL 11000, STXL 6303, STX16803 and FLI 5 series/CFW 5-7Filter Wheel and LRGB Filters
SI-EC35-505-13 - Starlight Instruments End Cap 3.5" for CFW2-7 Series/CCD Camera & Filter Wheels
SI-EC35-505-13 - Starlight Instruments End Cap 3.5" for CFW2-7 Series/CCD Camera & Filter Wheels
$190.00
« Back to All Add-ons
SI-EC35-505-13 - Starlight Instruments End Cap 3.5" for CFW2-7 Series/CCD Camera & Filter Wheels
About This Product
This End Cap fits the 3.5" Feather Touch focusers and has 2.0x24tpi male threads which are used to attach FLI CFW 2-7 Filter Wheel.

SI-EC35-505-65 - Starlight Instruments End Cap 3.5" for SkyWatcher M65 Male Threaded Accessories
SI-EC35-505-65 - Starlight Instruments End Cap 3.5" for SkyWatcher M65 Male Threaded Accessories
$160.00
« Back to All Add-ons
SI-EC35-505-65 - Starlight Instruments End Cap 3.5" for SkyWatcher M65 Male Threaded Accessories
About This Product
This 3.5″ End Cap fits the 3.5″ Feather Touch focusers for M65x1 SkyWatcher male threaded accessories
SI-EC35-505-72 - Starlight Instruments End Cap 3.5" for Takahashi Male Threaded Accessories
SI-EC35-505-72 - Starlight Instruments End Cap 3.5" for Takahashi Male Threaded Accessories
$160.00
« Back to All Add-ons
SI-EC35-505-72 - Starlight Instruments End Cap 3.5" for Takahashi Male Threaded Accessories
About This Product
This 3.5″ End Cap fits the 3.5″ Feather Touch focusers for M72x1 Takahashi male threaded accessories
SI-EC35-505-85 - Starlight Instruments Endcap 3.5" for StellarVue Field Flattener
SI-EC35-505-85 - Starlight Instruments Endcap 3.5" for StellarVue Field Flattener
$160.00
« Back to All Add-ons
SI-EC35-505-85 - Starlight Instruments Endcap 3.5" for StellarVue Field Flattener
About This Product
This 3.5" End Cap fits the 3.5" Feather Touch focusers for Stellarvue 85mm Field Flattener.
SI-EC35-505AP - Starlight Instruments End Cap 3.5" for AP Telescope Accessories
SI-EC35-505AP - Starlight Instruments End Cap 3.5" for AP Telescope Accessories
$160.00
« Back to All Add-ons
SI-EC35-505AP - Starlight Instruments End Cap 3.5" for AP Telescope Accessories
About This Product
This 3.5″ End Cap fits the 3.5″ Feather Touch focusers and is used with Astro Physics 2.7″ male threaded accessories. This threaded end cap can also be used with the Baader quick lock accessory which uses the A/P thread.
SI-A35-503-156 - Starlight Instruments Adapter 3.5" for APM 140/152mm Telescope
SI-A35-503-156 - Starlight Instruments Adapter 3.5" for APM 140/152mm Telescope
$250.00
« Back to All Add-ons
SI-A35-503-156 - Starlight Instruments Adapter 3.5" for APM 140/152mm Telescope
About This Product
Scope specific tube adapter to attach 3.5″ Feather Touch focuser onto APM 140 and 152mm Telescopes

Use with focuser FTF3545B-A
SI-EC35-505CR - Starlight Instruments End Cap 3.5" with 2" Compression Ring Opening
SI-EC35-505CR - Starlight Instruments End Cap 3.5" with 2" Compression Ring Opening
$160.00
« Back to All Add-ons
SI-EC35-505CR - Starlight Instruments End Cap 3.5" with 2" Compression Ring Opening
About This Product
This end cap fits Starlight's Feather Touch 3.5″ focusers and has a 2.0″ compression ring opening with 3 machined thumb screws.
SI-EC35-505-3CR - Starlight Instruments End Cap 3.5" with 3" Compression Ring Opening
SI-EC35-505-3CR - Starlight Instruments End Cap 3.5" with 3" Compression Ring Opening
$200.00
« Back to All Add-ons
SI-EC35-505-3CR - Starlight Instruments End Cap 3.5" with 3" Compression Ring Opening
About This Product
This 3.5" End Cap fits the 3.5" Feather Touch focusers and has a 3.0" opening for 3.0" accessories
SI-A35-503-103 - Starlight Instruments Adapter 3.5" for SkyWatcher Esprit 120/150
SI-A35-503-103 - Starlight Instruments Adapter 3.5" for SkyWatcher Esprit 120/150
$250.00
« Back to All Add-ons
SI-A35-503-103 - Starlight Instruments Adapter 3.5" for SkyWatcher Esprit 120/150
About This Product
True 3.0" adapter for carbon fiber Explore Scientific 152 and 165MM Telescopes.

Use with focuser FTF3235B-A
SI-A35-503-140 - Starlight Instruments Adapter 3.5" for Astro Tech 130
SI-A35-503-140 - Starlight Instruments Adapter 3.5" for Astro Tech 130
$250.00
« Back to All Add-ons
SI-A35-503-140 - Starlight Instruments Adapter 3.5" for Astro Tech 130
About This Product
Scope specific tube adapter to attach 3.5" Feather Touch focuser onto Astro Tech 130mm refractor

Use with focuser FTF3545B-A
SI-A35-503-145 - Starlight Instruments Adapter 3.5" for Takahashi FS128
SI-A35-503-145 - Starlight Instruments Adapter 3.5" for Takahashi FS128
$250.00
« Back to All Add-ons
SI-A35-503-145 - Starlight Instruments Adapter 3.5" for Takahashi FS128
About This Product
Scope specific tube adapter to attach 3.5″ Feather Touch focuser to your Takahashi FS128 telescopes

Use with focuser FTF3545B-A
SI-A35-503AP - Starlight Instruments Adapter 3.5" AP Threaded OTAs
SI-A35-503AP - Starlight Instruments Adapter 3.5" AP Threaded OTAs
$200.00
« Back to All Add-ons
SI-A35-503AP - Starlight Instruments Adapter 3.5" AP Threaded OTAs
About This Product
This 3.5″ Tube Adapter Ring will fit any Astro Physics 4.875″ female threaded Optical Tube Assembly

Use with focuser FTF3545B-A
SI-A35-503-AP-GT130 - Starlight Instruments Adapter 3.5" for AP GT 130
SI-A35-503-AP-GT130 - Starlight Instruments Adapter 3.5" for AP GT 130
$250.00
« Back to All Add-ons
SI-A35-503-AP-GT130 - Starlight Instruments Adapter 3.5" for AP GT 130
About This Product
Scope specific tube adapter to attach 3.5″ Feather Touch focuser onto the Astro Physics Grand Tourismo 130.

Use with focuser FTF3515B-A
SI-A35-503-FSQ106 - Starlight Instruments Adapter 3.5" for Takahashi FSQ106N
SI-A35-503-FSQ106 - Starlight Instruments Adapter 3.5" for Takahashi FSQ106N
$250.00
« Back to All Add-ons
SI-A35-503-FSQ106 - Starlight Instruments Adapter 3.5" for Takahashi FSQ106N
About This Product
Scope specific adapter fits Starlight's 3.5″ focusers directly for Pre-2009 Takahashi FSQ106N telescopes

Use with focuser FTF3545B-A
SI-A35-503-TOA130 - Starlight Instruments Adapter 3.5" for Takahashi TOA 130/FS 152
SI-A35-503-TOA130 - Starlight Instruments Adapter 3.5" for Takahashi TOA 130/FS 152
$250.00
« Back to All Add-ons
SI-A35-503-TOA130 - Starlight Instruments Adapter 3.5" for Takahashi TOA 130/FS 152
About This Product
Scope specific tube adapter to attach 3.5″ Feather Touch focuser onto Takahashi TOA130 or FS152 telescopes

The 3.5″ Feather Touch is actually bigger than the 4.0″ Takahashi stock focuser, this is because the 4.0″ measurement from the Takahashi stock focuser is the outside diameter and the 3.5″ measurement from the Feather Touch is the inside diameter.

Use with focuser FTF3545B-A
SI-A35-503-TOA150 - Starlight Instruments Adapter 3.5" for Takahashi TOA 150
SI-A35-503-TOA150 - Starlight Instruments Adapter 3.5" for Takahashi TOA 150
$270.00
« Back to All Add-ons
SI-A35-503-TOA150 - Starlight Instruments Adapter 3.5" for Takahashi TOA 150
About This Product
Scope specific tube adapter to attach 3.5″ Feather Touch focuser onto Takahashi TOA150 telescopes

The 3.5″ Feather Touch is actually bigger than the 4.0″ Takahashi stock focuser, this is because the 4.0″ measurement from the Takahashi stock focuser is the outside diameter and the 3.5″ measurement from the Feather Touch is the inside diameter.

Use with focuser FTF3545B-A
SI-A35-503-WOFLT152 - Starlight Instruments Adapter 3.5" for William Optics FLT151/FLT152/FLT158 and TS152
SI-A35-503-WOFLT152 - Starlight Instruments Adapter 3.5" for William Optics FLT151/FLT152/FLT158 and TS152
$270.00
« Back to All Add-ons
SI-A35-503-WOFLT152 - Starlight Instruments Adapter 3.5" for William Optics FLT151/FLT152/FLT158 and TS152
About This Product
Scope specific tube adapter to attach 3.5″ Feather Touch focuser onto William Optics FLT151, FLT152, FLT158 telescopes, and Teleskop Service 150/1000mm Telescope

Use with focuser FTF3545B-A
QTY:  
Price as Configured: $960.00
Product Help
Need help deciding?
Tell us what you're looking for, and we’ll point you in the right direction. .
Thread: 4.1x24tpi M on Draw Tube (End Cap Side)
Draw Tube Travel: 114.30 mm | 4.50 In
Racked In from Mounting Face: 108.077 mm | 4.255 In
Racked Out from Mounting Face: 222.377 mm | 8.755 In
Diameter at Back Side (Eye Piece) of Draw Tube: 92.71 mm | 3.65 In
Draw Tube Drive Mechanism: Helical Rack and Pinion 72 Pitch Reduction Ratio: 10:1 (Approximately)
Travel per Pinion Revolution: 21.46mm | 0.845 In
Lifting Capacity: 8-9 kg/18-20lbs