Manufacturer: Lacerta
Product number: Mikrountersetzung

EUR 99,95


incl. 19 % VAT (DE)  
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rating: 5.0 of 5
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LACERTA 1:10 Micro Focuser for Skywatcher Crayford focusers
Easy mounting - no need to dismount the focuser - reduction is adjustable.

A 1:10 micro focuser has been well proven in practical observing and astrophotography, it allows fine focusing. The 1:10 Micro Reduction Unit from Lacerta can be easily retrofitted to many Crayford focusers. The retrofit is done with the focuser mounted - disassembly is not necessary. The gear reduction does not fit on rack and pinion focusers.

The 1:10 reduction fits to ...
... all focusers with four base screws in 33 mm x 22 mm spacing
... Skywatcher ED refractors, Newtons, Dobsons, Black Line telescopes
... Vixen ED 80 and ED 100
... Orion USA ED refractors, Newtons, Dobsons
... and many others.
 
Micro reduction







Micro Transmission - installation manual

Tools needed:
Hex allen key 1.5mm / 2mm / 3mm / Philips screwdriver

Step 1: remove the original screws



Step 2: remove original pressure plate and shaft



Step 3 through 5: remove teflon bearing and keep it for later use.







Step 6: Place teflon bearing inside the micro focuser



Step 7 - 8: Remove one knob of the original shaft





Step 9 - 10: push the shaft into the micro tansmission and fix lightly.





Step 11: Fix micro transmission with mounted original shaft to the Crayford focuser.



Step 12: Check the micro transmission´s knob and fix lightly.



Step 13: Fine adjustment

13.a (Left allen key) Lower the pressure on the pressure plate until the drawtube can move freely. If necessary, turn the drawtube until the shaft lies on the full surface. Now, increase the pressure onto the pressure plate until the drawtube does not slide independently in and out.
Control 1: Check whether the Craford focuser runs smoothly or not. If yes, increase the pressure onto the shaft until the focuser has the desired resistance.

13.b (Right allen key) If the focuser still does not run smoothly. The planet wheel has to be adjusted also.



Step 14: Loosen the planet wheel housing with a minimal turn of the right allen key.

Like focusing, move the drawtube in and out while tightening both screws succesively. The planet wheel housing allows a small amount of play so their shaft can take its correct position alone.



If the micro focuser still doesn´t run smoothly, the Crayford shaft or the original casting is bended. Loosen the left allen screw again (decreasing pressure onto the Crayford shaft) and vary the tension of the four small Philips screws setting the pressure plate (Step 11). Then, repeat step 13 + 14.

Now the micro focuser is ready for use!


Further adjustment opportunities:

In some cases, play of the focus wheel may occur. The reason is a loosened set screw inside the knob. It is located beneath the rubber armour as shown on the photo:





With friendly permission by Lajos Szantho



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Reviews

Written by Michael Sherman
on 2022-10-03

"The micro-focus modification made a big difference for me."

Written by Rudolph Gerlach
on 2021-07-05

"Wie die Sterne es sagen: Es gibt nichts, was man bemängeln könnte, alles bestens geliefert"

Written by Costin Tuta
on 2020-10-13

"High quality product."

Written by Christian Rein
on 2017-03-27

"Tolles Produkt, rascher Umbau, funktioniert tadellos."

Written by Giovanni Principato
on 2016-12-15

Perfetto

Written by Holger Rentzow
on 2016-02-09

"Unverzichtbar, wenn man fotografieren will. Diese Mikrountersetzung ist sehr einfach nachzurüsten und funktioniert hervorragend. Eine sehr ausführliche Umbauanleitung ist dabei, damit kann auch der nicht ganz so Geschickte den Umbau durchführen."

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