Re: Zone Plate Image Generator

Hi Larry,
Nevermind that. For some reason, microsoft paint displayed nothing, while photoshop displayed it properly. I was expecting an output that one would photograph from a distance like what they have at http://members.home.net/hmpi/Pinhole/Articles/ZonePlate/Zone_Plate.htm. Is that how it is supposed to work, or does it give one the actual size? I made a zone plate calculator a while ago in visual basic. It calculated ring sizes, magnified sizes (for photographing from a distance) and also calculated the true f stop (just the area of the clear rings). If anyone wants it, I can compile it and send it out. If you want to add to it, let me know and i'll give you the source code. I don't really care what you do with it, post it on the web, whatever.

John
  ----- Original Message -----
  From: Larry Fratkin
  To: pinhole-discussion@pinhole.com
  Sent: Wednesday, December 27, 2006 6:47 PM
  Subject: Re: [pinhole-discussion] Zone Plate Image Generator

  john,
   Yes, I did put a few hours into this, but it was fun. Thanks for appreciating that.
   
  What were the settings you typed in? I'd like to repeat them to see what I get. Also, sometimes you really have to look for the zone plate in the middle of the image.
   
  Larry
    -----Original Message-----
    From: John Yeo <jonnieo@thegrid.net>
    To: pinhole-discussion@pinhole.com <pinhole-discussion@pinhole.com>
    Date: Wednesday, December 27, 2000 4:48 PM
    Subject: Re: [pinhole-discussion] Zone Plate Image Generator

    Larry, Thanks for making this. I'm sure you have already put a lot of work into it... but i get nothing but a blank bitmap. No rings at all.

    John
      ----- Original Message -----
      From: Larry Fratkin
      To: pinhole list
      Sent: Wednesday, December 27, 2006 3:52 PM
      Subject: [pinhole-discussion] Zone Plate Image Generator

      Folks,
       I have created a zone plate image generator so that I could make my own zone plates. The program downloads a .BMP so it's PC centric, I think. The idea was to use the program to generate a zone plate image and then take it to the bureau to have it put to film. They charge about $15.00 for this. I haven't tried it out yet so I don't know how well it works. I'll be visiting them on Friday and I'll drop it off then.
       
      The calculator/generator is at http://www.MrPinhole.com/zp.html
       
      Larry@MrPinhole.com
       
Received on Thu Dec 28 00:52:04 2000