remote focus advice please

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remote focus advice please

Postby EIZO » Tue Nov 28, 2017 5:24 pm

Ok, we have the scope setup that we bought last week what i am looking for is a remote focuser that fits to the OTA of the Celestron 8" HD Edge

I am told that they are available but JMI have not come back to me, any help please
Celestron Edge 8" Evolution, Esprit 120mm triplet, Sky Tee2, WO Binoviewers, 2" and 1.25" eyepieces, ZWO ASI 178MM camera, Neximage 5, Nikon D4s, D810, Nikkor 70-200 F2.8, Nikkor 14-24, Nikkor 70-200, Nikkor 24-120, Sigma 150-600 Sport
EIZO
 
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Re: remote focus advice please

Postby Aratus » Tue Nov 28, 2017 5:59 pm

The last heard JMI had sold up. There is a new distributor of the equipment, but I haven't seen the JMI types being promoted for a while. Do you have a low gear focuser? Remote focusing can be a nightmare without one.
I use an 11" reflector (Celestron CPC 1100) and a 3" refractor, (Sky-Watcher ST80) mounted on an equatorial wedge, housed in a 2.2m Pulsar observatory. I use a ZWO ASI 120MM, ZWO ASI1600MC and Canon 1300D for imaging.
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Re: remote focus advice please

Postby EIZO » Tue Nov 28, 2017 6:09 pm

no just as it came
Celestron Edge 8" Evolution, Esprit 120mm triplet, Sky Tee2, WO Binoviewers, 2" and 1.25" eyepieces, ZWO ASI 178MM camera, Neximage 5, Nikon D4s, D810, Nikkor 70-200 F2.8, Nikkor 14-24, Nikkor 70-200, Nikkor 24-120, Sigma 150-600 Sport
EIZO
 
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Re: remote focus advice please

Postby Gfamily2 » Tue Nov 28, 2017 11:48 pm

EIZO wrote:no just as it came


Are you looking to reduce shake when adjusting the focus, or do you want to make it easier to make fine adjustments?

If the latter, I've heard of people attaching a clothes peg (or equivalent) to the focus knob as the extra length can make it easier to make the fine adjustments
Scopes: Meade 8" SCT, Skywatcher 127mm Mak, Raffle winner of SW ST80
For imaging: Pentax K5, Asda webcam, Star Adventurer (new toy)
For companionship: Mid Cheshire Astronomical Group.
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Re: remote focus advice please

Postby EIZO » Wed Nov 29, 2017 10:27 am

we want to use the scope from indoors
Celestron Edge 8" Evolution, Esprit 120mm triplet, Sky Tee2, WO Binoviewers, 2" and 1.25" eyepieces, ZWO ASI 178MM camera, Neximage 5, Nikon D4s, D810, Nikkor 70-200 F2.8, Nikkor 14-24, Nikkor 70-200, Nikkor 24-120, Sigma 150-600 Sport
EIZO
 
Posts: 199
Joined: Sun Nov 26, 2017 9:09 pm

Re: remote focus advice please

Postby Aratus » Wed Nov 29, 2017 3:39 pm

One problem with a remote focuser is overshooting the focus, and continually having to keep going back and forth until you get it. Nothing beats the eyes and fingers when it comes to getting it right quickly. One solution is to get a dual focuser to go with the remote, that gives a low gear which slows the movement. Another is to get a multi-speed remote so when you get near to the right focus you can slow it right down. Either way you will pay an arm and a leg!

I'll be honest and say I'll never go back to a standard focuser after I've used a dual speed. Always factor in the extra cost of getting one.
I use an 11" reflector (Celestron CPC 1100) and a 3" refractor, (Sky-Watcher ST80) mounted on an equatorial wedge, housed in a 2.2m Pulsar observatory. I use a ZWO ASI 120MM, ZWO ASI1600MC and Canon 1300D for imaging.
Aratus
 
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Re: remote focus advice please

Postby EIZO » Wed Nov 29, 2017 4:33 pm

You are making assumptions that no one is disabled there are reasons to want to do things
Celestron Edge 8" Evolution, Esprit 120mm triplet, Sky Tee2, WO Binoviewers, 2" and 1.25" eyepieces, ZWO ASI 178MM camera, Neximage 5, Nikon D4s, D810, Nikkor 70-200 F2.8, Nikkor 14-24, Nikkor 70-200, Nikkor 24-120, Sigma 150-600 Sport
EIZO
 
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Re: remote focus advice please

Postby Aratus » Thu Nov 30, 2017 4:22 pm

EIZO wrote:You are making assumptions that no one is disabled there are reasons to want to do things


Am I?

I think the facts and advice I gave would be true of anyone whatever their ability. :?

If you want advice about using astronomical equipment in circumstances where someone has limited ability, then you ought to mention it in the beginning. For instance, although a remote system can fine tune focusing once a general area of focus has been achieved manually, it can take a long time to move the focus when making large changes to the focus. In those circumstances you might be better off with a multiple gear system. It might be worth considering using an 'ascom' system where a computer can be used to control the motor if handling fiddly controls is going to be unhelpful.
I use an 11" reflector (Celestron CPC 1100) and a 3" refractor, (Sky-Watcher ST80) mounted on an equatorial wedge, housed in a 2.2m Pulsar observatory. I use a ZWO ASI 120MM, ZWO ASI1600MC and Canon 1300D for imaging.
Aratus
 
Posts: 867
Joined: Tue Jan 12, 2016 2:17 pm
Location: East Lincolnshire

Re: remote focus advice please

Postby EIZO » Thu Nov 30, 2017 5:00 pm

My question was.....
Ok, we have the scope setup that we bought last week what i am looking for is a remote focuser that fits to the OTA of the Celestron 8" HD Edge

I am told that they are available but JMI have not come back to me, any help pleas

I should not have to mention any disability, the fact that a disability may exist is irrelevant to the general question.

Thank you, will look into ascom
Celestron Edge 8" Evolution, Esprit 120mm triplet, Sky Tee2, WO Binoviewers, 2" and 1.25" eyepieces, ZWO ASI 178MM camera, Neximage 5, Nikon D4s, D810, Nikkor 70-200 F2.8, Nikkor 14-24, Nikkor 70-200, Nikkor 24-120, Sigma 150-600 Sport
EIZO
 
Posts: 199
Joined: Sun Nov 26, 2017 9:09 pm


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