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Found 10 results

  1. Hi All, I have just made myself a light box for doing Flats which on my first play with it last night, seemed to work okay, but I am not sure what brightness / exposure level I should be aiming for? Attached are a few screen shots taken at different exposures (0.2 seconds up to 1.0 second), all taken at the same brightness level. Now, rather than changing the exposure, I can make the lightbox darker or brighter, but I will see similar images to those below. So my questions is, which one of these exposure times is the 'best'? I have included the histogram in each screen shot, as I understand that this is the important thing, or is it the number in the White / Black box which is important? Hope someone can offer some advice here 0.2 Second Exposure 0.4Second Exposure 0.6 Second Exposure 0.8 Second Exposure 1.0 Second Exposure
  2. Hi all While I've been largely locked under clouds for a couple of months, I thought I'd write some software that I've been meaning to get around to for a while. I use a standard LCD computer monitor for taking flats. I plug it in to my imaging laptop. I started off using a blank HTML page in a full-screen browser window to provide the uniform grey colour on the display but I needed to vary the brightness of the display for different filters. So, I wrote some software that does it. The software is called Second Monitor Lightbox and is available free of charge from my site (paw-print.com). If you use a CCD with filter wheel, it'll link to the filter wheel via the ASCOM driver so that, once you've set the perfect brightness for each filter, it will change brightness automatically as the filter changes. It also has a 'preset' mode for non-ASCOM set ups so that you can just re-call a pre-determined brightness to match a certain configuration (filter, binning, etc). There's a tutorial based around using SGP Pro on the site, so if you want to try it have a look through that. When you install it, Windows will warn you that it's from an Unknown Publisher. This is just because I don't pay Microsoft an annual fee for a developer's certificate. Just tell Windows to install it anyway - you may need to click 'More information' to get the option to go ahead. Let me know what you think. I hope some of you will find it useful. I know it saves me a load of hassle at the end of a long session trying to get the right brightness level to give decent flats for each filter. You can get it from here: http://paw-print.com Steve
  3. sabin_fota

    circuit 5V 4LED

    From the album: LightBox 90mm refractor

    © SabinFotafotografie

  4. sabin_fota

    diagram

    From the album: LightBox 90mm refractor

    © SabinFotafotografie

  5. sabin_fota

    P1040839 resize

    From the album: LightBox 90mm refractor

    © SabinFotafotografie

  6. sabin_fota

    P1040832 resize

    From the album: LightBox 90mm refractor

    © SabinFotafotografie

  7. sabin_fota

    P1040826 resize

    From the album: LightBox 90mm refractor

    © SabinFotafotografie

  8. sabin_fota

    P1040845 resize

    From the album: LightBox 90mm refractor

    © SabinFotafotografie

  9. sabin_fota

    IMG 5172 resize

    From the album: LightBox 90mm refractor

    © SabinFotafotografie

  10. sabin_fota

    wiring and leds

    From the album: LightBox 90mm refractor

    © SabinFotafotografie

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