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How to electrically focus manaul camera lens?

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11 replies to this topic

#1 Michael Morris

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Posted 28 June 2014 - 09:15 AM

I recently purchased a Pentax Takumar 200mm lens for astrophotography with my Canon DSLR. I'm really pleased with the lens, but I miss having the ability to drive the focus remotely. One idea would be to somehow drive the focus ring with a Skywatcher/Orion autofocus motor (I have two, and it wouldn't take long to remount one). Does anyone know of any examples of how this (or a similar solution) has been executed?

Thanks

#2 Jerry Lodriguss

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Posted 28 June 2014 - 10:13 AM

Hi Michael,

I don't know about that specific lens, but folks have done this, you can use a belt drive like this one or this one.

Jerry

#3 CharlesW

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Posted 28 June 2014 - 10:34 AM

http://www.robofocus..._category_1.htm

#4 andysea

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Posted 28 June 2014 - 12:39 PM

I have assembled a similar system with a Robofocus motor and a belt. It works very well and I use SGP for automated focusing. I can use it with many different lenses.

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#5 Peter in Reno

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Posted 28 June 2014 - 01:04 PM

I don't know if this will work with DSLR, but check this out.

http://store.qsimagi...ode=ACX-BRACKET

Peter

#6 tomcody

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Posted 28 June 2014 - 01:25 PM

Here is a bracket system for it:
web page
Rex

#7 fetoma

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Posted 28 June 2014 - 01:27 PM

I use a belt driven Orion Accu-Focus.

#8 andysea

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Posted 28 June 2014 - 01:58 PM

Rex thanks for that link! I didn't know that FT made their version and it's a really good price. I may have to get one:)

#9 andysea

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Posted 28 June 2014 - 02:24 PM

Unless the Orion unit can be fitted with a pulley it may be difficult to have it drive a mini timing belt.

#10 fetoma

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Posted 28 June 2014 - 04:52 PM

Here's my rig:

The Orion focus motor is attached to the ADM dovetail to slide and adjust to the lens using the belt.

The camera is mounted to the Losmandy dovetail and can adjust in and out.

Finder and DSI Pro for guiding.

Completely adjustable for almost any scenario.

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#11 PaulEK

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Posted 28 June 2014 - 11:23 PM

Frank:

Great setup! I now have another project.

#12 Michael Morris

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Posted 29 June 2014 - 08:08 AM

Here's my rig:

The Orion focus motor is attached to the ADM dovetail to slide and adjust to the lens using the belt.

The camera is mounted to the Losmandy dovetail and can adjust in and out.

Finder and DSI Pro for guiding.

Completely adjustable for almost any scenario.


That's great. What is the spec for the pulley and belt? (I'm having great difficulty working out what to order)


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