HOME
<Kasai ST Micro Focuser> ¥26,500
High-performance low-profile focuser to fill the requirements of serious telescope users, ensuring smoothness, rigidity, versatility and compactness. Many sorts of adapters, bases & rings are available to fit various telescopes.
<Draw Tube>
Stainless steel rails are embedded on the drawtube surfaces to touch upper bearings and the lower focusing shaft. Those rails are effective not only for reducing the abrasion after long-term use, but for reinforcing the drawtube rigidity, preventing bending and shake when heavyweight devices are connected, yet ensuring smooth focusing touch. The inner surface is fully deep-threaded and mat-black painted to eliminate the stray light. Metric & inch scales on the upper surface. 30mm focus travel. The height from bottom to top (the edge of the 2” eyepiece adapter) is only 45mm low-profile. 3-point fastening screws with a brass compression ring for 2” eyepiece adapter. Comes with a 2”/1.25” Adapter (w/M48 filter threads) of only 3mm additional height.
<Focusing Mechanism>
Equipped with 43mm & 32mm O.D. large focusing knobs to yield 1:10 micro focusing. Both the knobs can be rotated so smoothly as not to cause any vibrations when focusing. Crayford style with 4 roller bearings & a focusing shaft causes no backlash or play. The center part of the focusing shaft is diamond-powder coated to prevent slip and to ensure maximum stability. The focusing tension adjuster and the drawtube stopper are of course equipped. Ensuring strong holding power up to 5kg load.
<Housing & Finish>
All the parts are precisely CNC-machine made, and all the outer surfaces are mat-black anodized to be strong against scratches.
<Adapter Rings & Bases>
A lot of adapters, rings & bases are available so that ST focuser can be attached to various telescopes.
Eyepiece Adapter Format 2"
Focus Travel 30mm
Out. / In. dia. of Drawtube 58mm / 51mm
Height
(Bottom to 2" Adapter)
45mm~75mm
Max. Width
(focusing knob to knob)
150mm
Installation Format 78mm dia. taper
(Male / GSO Compatible)
Weight 720g
(810g incl. 1.25" Adapter)
Max. Load about 5kg
Other Features *Diamond-Powder Coated Focusing Shaft
*Tension Adjuster & Stopper Equipped
Standard Accessory 2"/1.25" Adapter (7.5mm Additional Height / M48 Filter Threads)
Kasai ST Micro Focuser is compatible with GSO 2" Crayford Newtonian Focusers & Baader 2" Steeltrack Newtonian Focusers - exchangeable without any additoonal adapters or toolings.
★ Optional Components for Kasai ST Micro Focuser ★
<Newtonian Baseplate (S/M/L)> ¥2,800/ea.
(S = 160mm-190mm Tube O.D. / M = 215mm-245mm Tube O.D. / L = 280mm-320mm Tube O.D.)
Focuser bases to fit round-tube Newtonian telescopes. 6mm Additional height. Outside dimension 91mm x 90mm. The distances of the fixing screw holes 70mm x 73mm. M4 fixing screws (x4). Weight: S=100g / M=90g / L=80g.
<Universal Newtonian Baseplate> ¥4,800
A universal focuser base to fit O.D. 200mm to flat Newtonian tube. The focuser housing can be fixed so rigidly as tightened with 4 screws. 5mm additional height. Outside dimension 85mm x 110mm. The distances of the fixing screw holes 54mm x 88mm. M4 fixing screws (x4). Weight: 100g.
<Newtonian Baseplate w/Rotary Function (S/L)> ¥6,800/ea.
(S = 160mm-250mm Tube O.D. / L = 250mm-580mm Tube O.D.)
360-degree rotatable focuser bases for Newtonians. Normally fixed on telescope tubes with M4x4 screws, and additionally ellipse screw holes (for M4-M5) are equipped, enable to slide the focuser forward or backward, to adjust the backfocus or secondary mirror position. 15mm additional height. Outside dimension 92mm x 116mm. The distances of the fixing screw holes 54mm x 88mm. M4 fixing screws (x4) or M4-M5 fixing screws (x2). Weight: S=160g / L=130g.
<Newtonian Flat Baseplate> ¥2,800
A focuser base to fit a flat Newtonian tube. 8mm additional height. Outside dimension 90mm x 90mm. The distances of the fixing screw holes 70mm x 73mm. M4 fixing screws (x4). Weight: 65g.
<Advanced Newtonian Flat Baseplate> ¥4,800
A focuser base to fit a flat Newtonian tube. The focuser housing can be fixed so rigidly as tightened with 4 screws. The focuser squaring is adjustable with M3 screws beside the base fixing screws, ideal for prime-focus photography which requires the parallelism of the optical axis and the focuser. The fixing screw holes are oval (5mm margin). 5mm additional height. Outside dimension 84mm x 84mm. The distances of the fixing screw holes 67-72mm x 67-72mm. M4 fixing screws (x4). Weight: 27g.
<15mm Riser> ¥3,800
<25mm Riser> ¥4,800
Inserted between kasai ST Micro focuser and an adapter or a base to raise the focuser height. The focuser can be fixed tightly with 5 setscrews. More stable than normal extension tubes as the focuser itself rises. Possible to stack several units. Ideal for adjusting the backfocus or improving the operability of the focusing knobs (especially for Newtonians). Max. O.D. 84mm. Weight: 15mm = 60g / 25mm = 110g.
<I.D. 80mm Adapter> ¥2,800
The adapter ring to fit 80mm inner dia. Focuser bases for Newtonians, such as some SYNTA or LongPerng focusers. 8.5mm additional height. Max. O.D. 85.5mm. Weight: 40g.
<Dual-Fit SCT Adapter> ¥5,800
The adapter ring to fit SCT’s & Mak-Cassegrains with 2” threads rear cells. 360-degree rotatable. Also fits 3.3” large format threads (of C-11 & C-14) removing the bottom ring. 40mm additional height. Max. O.D. 89mm. Weight: 150g.
<GSO Ritchey-Chretien 2” Adapter> ¥6,800
The adapter ring to fit GSO 6” – 8” Ritchey-Chretien Telescopes (M90 format). 360-degree rotatable. 24mm additional height. Max. O.D.97mm. Weight: 145g.
<GSO Ritchey-Chretien 3” Adapter> ¥8,800
The adapter ring to fit GSO 10” – 20” Ritchey-Chretien Telescopes (M117 format). 360-degree rotatable. 26mm additional height. Max. O.D.124mm. Weight: 240g.
<BORG Compatible Adapter> ¥2,800
The adapter ring to fit BORG 80mm O.D. tube system (w/M68.8 format). 9mm additional height. Max. O.D. 84mm. Weight: 25g.
<Feather-Touch Compatible Adapter> ¥2,800
The adapter ring to be compatible with Starlight-Instruments Feather-Touch 2” focuser format. With this adapter, Kasai ST Micro focuser can fit various adapter selections of Feather-Touch Focusers. 9mm additional height. Max. O.D. 84mm. Weight: 30g.
<GSO/UO Refractor Adapter> ¥3,800
The adapter ring to be compatible with GSO/United-Optics 2” refractor focuser format. With this adapter, Kasai St Micro focuser can be attached to UO 70mm – 110mm refractors, etc. 360-degree rotatable. 16mm additional height. Max. O.D. 86mm. Weight: 60g.
<Refractor Adapter Set (I.D.86mm)> ¥7,800
<Refractor Adapter Set (I.D.96mm)> ¥8,800
The adapter ring sets to fit mass-market refractors. I.D. 86mm type fits 80-90mm refractors with 90mm O.D. tubes (86.5mm or more inside dia.) I.D. 96mm type fits 100-150mm SYNTA refractors with focuser adapters of 96mm inside dia. Both the types can be attached with M4x3 screws (120-degree distances.) 33mm/35mm additional height. Max. O.D. 93mm/100mm. Weight: 200g/210g.
<GSO/UO Focuser Compatible Adapter> ¥2,800
With this ring, GSO/United-Optics 2” refractor focusers become compatible with Kasai ST Micro Focuser, being able to utilize all the above adapters & bases. 3mm additional height. Max. O.D. 84mm. Weight: 45g.
Kasai Trading Co., Ltd.
5-19-33, Kami-Meguro, Meguro-Ku, Tokyo 153-0051, JAPAN

TOP PAGE  HOW TO ORDER