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Old 24-08-2018, 06:02 PM
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Flat field help for the RASA

I had me end of trouble with getting flats at astrofest and needed something to help achieve those.

After seeing one of these in real life this afternoon with Scott Alder it looks like what I need and the price was right as too the size.
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Old 24-08-2018, 08:47 PM
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Looks good. Can you dim the light?
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Old 24-08-2018, 08:54 PM
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Looks good. Can you dim the light?
http://vi.raptor.ebaydesc.com/ws/eBa...=0&cspheader=1
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Old 24-08-2018, 08:58 PM
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A2 Dimmable LED Art Stencil Tracing Drawing Board Lightbox Pad Touch Sensor OZ
AU $59.92
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Old 24-08-2018, 09:03 PM
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The characteristics you need are a reasonably broad & continuous output spectrum and good uniformity across the whole panel. If it does both of those then you've found a cheap solution to a difficult problem...
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Old 24-08-2018, 09:04 PM
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USB power. Wonder if you can vary the voltage.
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Old 24-08-2018, 09:10 PM
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The characteristics you need are a reasonably broad & continuous output spectrum and good uniformity across the whole panel. If it does both of those then you've found a cheap solution to a difficult problem...
From the demo that Scott showed me it runs off USB and has 3 settings, the middle one looked the most even.
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Old 24-08-2018, 09:15 PM
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Can you borrow it and try it out?
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Old 24-08-2018, 09:49 PM
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Can you borrow it and try it out?
Probably but for the price I just ordered one online
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Old 24-08-2018, 09:51 PM
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Probably but for the price I just ordered one online
Fair enough
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Old 25-08-2018, 06:58 AM
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If it doesn't give even illumination by itself, you might be able to knock up a bit of a box (cardboard, craft foam - something stiff and light) and white perspex at a bit of spacing that should even the light out a bit more.
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Old 25-08-2018, 07:15 AM
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I do have a roll of drafting film I can add over the top. But you couldn't build this for the price, if it works for me I will be overjoyed
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Old 28-08-2018, 12:49 PM
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Got the A2 delivered today. Power is micro USB cable to main transfo plug. 2000mA/5V. One switch on/off. If you keep your finger on the switch it dims from max to min. Pretty cool. Easy to use. Good build. Like it a lot.
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Old 28-08-2018, 01:10 PM
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Got the A2 delivered today. Power is micro USB cable to main transfo plug. 2000mA/5V. One switch on/off. If you keep your finger on the switch it dims from max to min. Pretty cool. Easy to use. Good build. Like it a lot.
Was it the Same one as I ordered And how did you get it so quickly
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Old 28-08-2018, 01:15 PM
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Was it the Same one as I ordered And how did you get it so quickly
Got this one. Ordered Friday got it delivered today.
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Old 28-08-2018, 06:37 PM
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Got this one. Ordered Friday got it delivered today.
You quite achieving bugger

I thought they were just A3
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Old 28-08-2018, 07:42 PM
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You quite achieving bugger

I thought they were just A3
A2' ish. I went for the high roller 16:9 big screen. I find that I have to rotate my A3 with the C11 on the dewshield to cover all and it doesn't dim very well either. My A4 dims no problem. These new ones seem to dim really well, and they're cheap. No glass either so I won't break anything.
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Old 05-09-2018, 09:15 PM
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OK mine turned up today, not happy with the packaging or shipping. just had a round of tape sideways over it and the box is flimsy but it was intact. it works of the USB3 port rather well and i can adjust more than 3 settings, it seems to be able to dim smoothly down and up to any level. its light, and looks like it will do the trick. thanks Scott for showing me it in the first place
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Old 10-09-2018, 10:09 AM
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ok managed to get things up and running. i will be using APT flats calculator to work things out. using some different settings
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Old 10-09-2018, 10:17 AM
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Funky looking pattern in that last shot, H0ughy?
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