Ronchiscreens.com is, sadly, gome and no longer has valid page content, but the owners were kind enough to post the PDF file for three screen sizes in the past.
It is, thankfully, still downloadable through the web archive, the Astro fan resource for most of the missing, now dead, content we need.
I just made an additional copy while searching out the webarchive link date that worked.
I got a odd not saved content page display, but the pdf downloaded just fine.
EDIT: I clicked on the link in the box just below the 'Wayback Machine' logo, see next post. The Archive may not have directly saved the asset.
EDIT EDIT: As mentioned below, I used a webarchive tool to add the pdf to the saved assets, so the webarchive should work sans clicking the link to ronchiscreens- I expect that direct link to expire eventually.
I would have this printed at a FedEx Kinkos, etc on transparent acetate on a high res laser printer. But I'm sure a home laser and possibly ink jet (ugh, a $75 canon laser blows ink jets away) might make a usable grating.
I find it very strange that Ronchi gratings, possibly the best affordable Astro tool I've ever used, are so hard to get now. I had to order my metal film Gerd Neumann directly from Germany.
Start printing those screens!
Let others know if they work well for you.
Edited by markb, 22 December 2021 - 09:53 AM.