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dark current noise

Started Jan 5, 2016 | Discussions thread
OP alexisgreat Veteran Member • Posts: 6,459
Re: Home-made "slim" T-Ring adapter for Micro 4/3

Astrotripper wrote:

alexisgreat wrote:

I wanted to compliment you again on some great ingenuity here,

Thanks

I also wanted to add that I think you can also use 1.25" filters, you could screw them where the barlow goes (and if the barlow is threaded for filters use both together also.)

Yes, I think I mentioned that before. Also, the chrome part of the tube is also screwed on and can be replaced by one from one of the Sky-Watcher eye-pieces. I earlier wrote that it's shorter, but when I checked now, it turns out I was wrong, it's simply the exact same part. Looks like all the kit accessories Sky-Watcher made for the telescope I have are made to share as much parts of their construction.

I wonder what the minimum distance from filter to focal plane would be with your set up?

The distance from the base of the custom T-ring, to the end of the barlow lens tube (where you would screw the filter on) is 65mm. It's about 55mm alone, without a T-ring. So it's a pretty long thing, much longer than a dedicated threaded nosepiece that you linked to earlier.

Thanks, I'm trying to figure out if there is any way I can get the filter close enough to the sensor of the E-PL6 to avoid vignetting.  At f/10 it needs to be 54mm from the sensor, at f/6.3, 35mm.

 alexisgreat's gear list:alexisgreat's gear list
Olympus C-7070 Wide Zoom Fujifilm FinePix HS20 EXR Fujifilm FinePix HS50 EXR Olympus E-520 Olympus PEN E-PL6 +3 more
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