> On 07/02/2025 19:20 GMT Larry Colen <l...@red4est.com> wrote: > > > On 2025-02-07 10:17, Ralf R Radermacher wrote: > > Am 07.02.25 um 10:49 schrieb Brian Walters: > >> G'day all > >> > >> Some truly spectacular and innovative submissions this month. > >> > >> Enjoy the gallery here: > >> > >> http://pug.komkon.org/ > > > > What an exquisite collection of great shots, with the obvious > > exception of the sillyness posted by yours truly. Kudos to one and > > all. > > > > I'm still fascinated by Mark's wasp. How is this done with a manual > > focus lens? Adjusting the focus in 135 microskopic steps? My mind > > boggles. Please explain. > > I think that such stacking is done by moving the camera. Put it on a > rack, and move the rack the same fraction of a turn of the handle for > each shot. I was told someplace that the magnification changes less by > moving the camera than it does by changing the focus. > > I've never tried such hijinx I'm afraid.
I've watched Jostein doing this. His contraption was/is electrically powered, so once the setup is complete, you only need to press the go button. There are a large number of hard parts for this type of work but one of the hardest is preparing the specimen; removing dust and other pollutants, arranging parts (animal subjects are almost invariably deceased) and otherwise posing and lighting. I seem to remember that Jostein's rig could have both the number and size of the increments altered. Difficulties include calculating the depth oo movement such that you do not run out of focus, leaving either the front or rear of the subject blurred. -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
