Scattered Thoughts . . .

Yesterday, I got to thinking about macro photos.  These close-up photos require some special equipment so I was wondering if I could patch something together to allow me to do some macro photography. Back a couple of weeks ago, I did try adding a macro converter lens to the front end of a couple of my old Pentax 645 lenses.  That worked "okay" but I did need to crop the photos a bit to eliminate hard vignetting.  It worked but it wasn't ideal. Yesterday, I remembered that one of the lenses I have been using on this Fuji GFX medium format camera is a Pentacon 50mm lens with a m42 mount.  The m42 mount is really just m42 threads.  It just so happens that I already use m42 fittings for my astronomy gear so I had a few m42 extension tubes on hand already.  Adding an extension tube allows me to get far closer to the object I'm photographing.   Every lens has a minimum focus distance...  if you try to get closer than this minimum focus distance, th...

M y little project for yesterday morning was to get the spacing adjusted correctly so I can capture the complete full disk of the sun including any prominences that may be extending from the limb in Hydrogen Alpha (Ha) with my current telescope and camera.  This little project was actually a tedious process of trial and error but I succeeded as seen in the photo (at right).   In hindsight, I should have set up my new mount for this project so I didn't have to constantly spend time tracking the sun manually.  Instead, I used a lightweight manual mount that has no slow motion controls because I am still quite sick with either COVID or a bad respiratory cold.  Setting up the new mount would have required more energy than I have right now so I opted for a much smaller mount.  Unfortunately, this smaller mount made this project a bit more tedious than it needs to be.  I was constantly nudging the telescope to keep it in my field of view as the sun slowly mo...