The Event Horizon Focuser (EV) is a low-profile, friction-drive focuser designed for both the amateur and professional market.  The highly acclaimed Crayford design (see below) permits tolerances up to 100 times better than conventional rack-and-pinion focusers.  Zero image shift and zero backlash makes it fantastic for visual and photographic work and a  must for CCD imaging. 


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Product Image Price Item Name+

JMI Reverse Crayford 1¼" Focuser $121.00

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JMI Reverse Crayford 1¼" Focuser

JMI Reverse Crayford 1¼" Focuser For all RCF focusers you must specify whether you want a flat or curved base.  For curved bases, you need to specify the radius.  If you don't, you will get the standard size radius.  Please specify your...

JMI Reverse Crayford 1¼" Focuser with Motor $274.00

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JMI Reverse Crayford 1¼" Focuser with Motor

JMI Reverse Crayford 1¼" Focuser with Motor For all RCF focusers you must specify whether you want a flat or curved base.  For curved bases, you need to specify the radius.  If you don't, you will get the standard size radius.  Please specify...

JMI Reverse Crayford 2" Focuser $140.00

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JMI Reverse Crayford 2" Focuser

JMI Reverse Crayford 2" Focuser For all RCF focusers you must specify whether you want a flat or curved base.  For curved bases, you need to specify the radius.  If you don't, you will get the standard size radius. Place a note in the shopping...

JMI Reverse Crayford 2" Focuser with Motor $296.00

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JMI Reverse Crayford 2" Focuser with Motor

JMI Reverse Crayford 2" Focuser with Motor A 1.25" Reverse Crayford focuser.  Motorized version include a standard hand unit.  For all RCF focusers you must specify whether you want a flat or curved base.  For curved bases, you need to...


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