JMI EV-2n Event Horizon Telescope Focuser - Newtonian

SKU: EV-2n
JMI EV-2n Event Horizon Telescope Focuser - Newtonian
JMI EV-2n Event Horizon Telescope Focuser - Newtonian
JMI EV-2n Event Horizon Telescope Focuser - Newtonian
JMI EV-2n Event Horizon Telescope Focuser - Newtonian
JMI EV-2n Event Horizon Telescope Focuser - Newtonian
JMI EV-2n Event Horizon Telescope Focuser - Newtonian
JMI EV-2n Event Horizon Telescope Focuser - Newtonian
JMI EV-2n Event Horizon Telescope Focuser - Newtonian
JMI EV-2n Event Horizon Telescope Focuser - Newtonian
JMI EV-2n Event Horizon Telescope Focuser - Newtonian
JMI EV-2n Event Horizon Telescope Focuser - Newtonian
JMI EV-2n Event Horizon Telescope Focuser - Newtonian
JMI EV-2n Event Horizon Telescope Focuser - Newtonian
JMI EV-2n Event Horizon Telescope Focuser - Newtonian
JMI EV-2n Event Horizon Telescope Focuser - Newtonian
JMI EV-2n Event Horizon Telescope Focuser - Newtonian
JMI EV-2n Event Horizon Telescope Focuser - Newtonian
JMI EV-2n Event Horizon Telescope Focuser - Newtonian

JMI EV-2n Event Horizon Telescope Focuser - Newtonian

SKU: EV-2n
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John Anderson
EV-2N Unusable due to wrong drawtube.

JMI EV-2N Newtonian focuser was shipped with 2 inch long SCT drawtube with one half inch of travel rendering it unuseable in a newtonian.

When I inquired about the error, I received this response via email

Hi xxxxxxx,

It turns out that a former employee had input an incorrect description.

The drawtube is 2.25” allowing for .8” of travel.

These are designed for Astrophotography and are not an all-purpose solution for popping in an eyepiece.

Making one with a longer drawtube effectively turns an 8” scope into a 4’ because of the amount of light that would be lost. (paraphrasing my boss who gave me a detailed explanation)

Set-ups should be designed for one thing or another, there is no effective all-in-one solution.

That said, the description is wrong. If you would like to return the focuser, I can get that started for you.

Let me know what you’d like to do.

Thank you,

Daniel

Of course JMI never offered a 2.25 inch drawtube. And even for astrophotography most serious users would employ a Paracorr II, which itself would stick in past the too short drawtube. As the nosepiece of the Paracorr itself is 75mm long (2.95 inches)

I tried to get either the correct 3 inch drawtube, I would have even taken a 2.5 inch drawtube, or a replacement focuser with the correct drawtube. But was told that no other drawtubes were available.

I eventually got an RA#, and was told I would receive a return label. But still have not received the return label two weeks later.

I tried to get either the correct 3 inch drawtube, I would have even taken a 2.5 inch drawtube, or a replacement focuser with the correct drawtube. But was told that no other drawtubes were available.

I eventually got an RA#, and was told I would receive a return label. But still have not received the return label two weeks later.

JMI EV-2n Event Horizon Telescope Focuser - Newtonian 

Comes with no optical adapters so that you can select the optional adapter(s) you need, if any.

Select JMI Combination 1.25-inch Eyepiece and T-Thread Adapter, ADPT2-1.25T for camera use. JMI Adapter for mounting a CCD or other camera, with a standard T-thread, into a 2" drawtube. It also doubles as a 1.25" adapter. A T-adapter holds a CCD camera more securely than a standard 1.25" adapter. The adapter uses a compression ring to secure inserted equipment. It includes standard 48mm filter threads on the other end of the adapter (inserted into focuser end).

Select Farpoint 2 Inch Focuser to 1.25 Inch Eyepiece Adapter, FAV100 for a visual 2" to 1.25" eyepiece adapter. Farpoint 2 Inch Focuser to 1.25 Inch Eyepiece Adapter features a non-marring compression ring for precise centering of telescope eyepieces. Threaded for both 2 inch and 1.25 inch filters and has a stop to prevent long eyepieces from damaging filters. 

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A masterpiece of engineering and workmanship, JMI Event Horizon Telescope Focuser - Newtonian is a low-profile, friction-drive focuser designed for both the amateur and professional telescope market.

The highly acclaimed Crayford design uses high pressure on a metal drive shaft pressing against a 3"metal drawtube which is held by bearings on the opposing side. This direct surface-to-surface drive mechanism eliminates backlash and shifting of the drawtube as seen in other designs such as the rack-and-pinion focuser, and allows for very fine adjustments. Zero image shift and zero backlash makes this focuser fantastic for visual and photographic work and a must for CCD imaging.

Featuring a 2″ black-anodized aluminum focuser design with pusher bearing and rubber grip gold knobs. The focuser lifts up to 8 pounds and its manual control is over 1½ times finer than most rack-and-pinion focusers. Includes a compression ring in the drawtube for holding telescope eyepieces and accessories without scratching the equipment. The adjusting screw presses against the ring which tightens around the eyepiece or accessory.

Reducing adapters pictured are available separately.

Compatible with Newtonian telescopes and mounts on a range of surfaces from a 7.25″ diameter, or larger, tube to a flat surface.  

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