Focusing problem with ASI120MC

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Focusing problem with ASI120MC

Postby Bersa81 » Mon Mar 21, 2016 7:22 am

Hello! I've just bought an ASI120MC for guiding and imaging, but it seems that I'm doing something wrong, I've searched the forum but I can't find any solution.

My setup:
- Skywatcher Equinox 80ED on Vixen Sphinx NexSXD modded
- 9x50 with helical focuser finder
- ASI 120mc + Canon 7D
- PHD2 + Nebulosity 3 software

My problem:
- I can focus with the provided lens (CCTV lens). When I try to focus with scope or finder I can't even get closer to anything focused. I've tried estending the focuser lenght (31,8 - 50 adaptor), or removing the adaptor from camera body and connect it "naked" to the scope. It should be a backfocus issue, but I'm not able to solve it myself moving in either direction (shorter or longer).

Does anyone have the same problem? How can I try to solve it?
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Re: Focusing problem with ASI120MC

Postby riklaunim » Mon Mar 21, 2016 11:19 am

You use the nosepiece ot T2 thread connection and it has to focus. For some refractors extension may be needed but still you should be able see image coming to focus when you pull the camera away from the focuser. Most finderscope should work unless they expect 1,25" camera body going inside (designed for QHY5 II)
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Re: Focusing problem with ASI120MC

Postby Bersa81 » Mon Mar 21, 2016 1:05 pm

I've already tried the adapter that comes with the camera, but no image forming... Totally out of focus.
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Re: Focusing problem with ASI120MC

Postby Sam » Mon Mar 21, 2016 1:45 pm

you should try at it daytime or use the moon at night
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Re: Focusing problem with ASI120MC

Postby Bersa81 » Mon Mar 21, 2016 1:52 pm

Already tried with the moon... I just see a glowing white light :( . I'd just like to find out in which direction should I move (I thing "out" or longer distance) and how to achieve the right one...
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Re: Focusing problem with ASI120MC

Postby David Staup » Mon Mar 21, 2016 2:55 pm

Try holding a sheet of paper behind the focuser when pointed at the moon at night. you will be able to find focus. measure the distance. that will tell you where the sensor should be placed.
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Re: Focusing problem with ASI120MC

Postby riklaunim » Mon Mar 21, 2016 6:20 pm

Bersa81 wrote:Already tried with the moon... I just see a glowing white light :( . I'd just like to find out in which direction should I move (I thing "out" or longer distance) and how to achieve the right one...


Overexposed? :)
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Re: Focusing problem with ASI120MC

Postby Landbo » Mon Mar 21, 2016 7:57 pm

Bersa81 wrote:Already tried with the moon... I just see a glowing white light :( . I'd just like to find out in which direction should I move (I thing "out" or longer distance) and how to achieve the right one...


You could remove (screw) the corrective lens of an Barlow and use the house as an extension. ;)

Regards Leif.
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Re: Focusing problem with ASI120MC

Postby Bersa81 » Mon Mar 21, 2016 10:24 pm

I've tried with an extension tube, but nothing... I Think I will try as suggested to find the focusing point of my scope.
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Re: Focusing problem with ASI120MC

Postby paul777 » Wed Mar 30, 2016 3:36 pm

I have an old LX90 (LX200 without GPS). I am new to digital photography but had taken a few pictures some years back using an Olympus OM10.

I am having a similar issue with my ASA120MC-S. I can get a preview on my computer with the supplied lens but I just get a dark screen when attached to the telescope. I have tried an extension tube (adjustable about 8-15cm) but no difference. I haven't even set up at night yet - I was trying to get things roughly right on day targets.

Any suggestions? I'm sure it is to do with the focal point and I just need the right length extension.
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