Margaret West
About the Image(s)
This is a little different this month. These are crystals from citric acid. I have been tearing my hair out trying to get good crystals! And then if there are a few areas on the slide that are interesting, I am tearing my hair out trying to get a good photo. I tried photostacking 3 images for this one. I also tried to orient it so that it had a flow through the photograph. I love the colors but think I have along way to go yet. I am very very open to suggestions down to how you mix your crystal solution! I shot this with my R5 directly attached to a microscope, 1/40 (with electronic shutter and a remote trigger to hopefully eliminate any shake) at ISO 200.
This round’s discussion is now closed!
10 comments posted
I think this is a super result. It's all sharp, with lovely colours and patterns. Well done for persisting!
You're right, getting good crystals is the first challenge. Most salts will crystalise nicely, and you can do it by spreading a thin flim of saturated solution over a glass slide, and build it up in layers as they dry. Or you can hang a crystal in a jar of saturated solution and leave the jar open so that some water (or solvent) evaporates, forcing super-saturation of the solution and growth of the crystal. You can get them an inch long or more that way, it depends on the salt and the presence of impurities. For thin layers, I mix my solutions in small glass bottles (say 5cc), and drop them onto microscope slides using a small pipette with a rubber bulb on (less than 1cc tubes). All cheap on ebay.
Thin films and bigger crystals present different challenges to get a good photo of them. Crystals I find usually need focus stacking, but thin films don't. Both need good and suitable light. Many colourful pictures like this one come from birefingence. If you google "birefingence photography" you'll get lots of information. You need 2 polarising filters to do this. I would guess your icroscope has the facility to hold them in place - 1 above the specimen, and one below it, above the illuminator.
In this case, we are seeing interference patterns - light is reflecting inside the crystals, and various light paths are hitting each other in such a way as they interfere with each other, causing the rainbow colours. A bit like a thin layer of oil on water. The result is very beautiful, I think, and the presence of some crystals having no colour improves the picture by giving colour contrast.
Having a proper microscope to use, I hope you do more for all our enjoyment. One day I'll get round to buying a small stereo one, which seem to be best suited to our scale of operation.
Have you seen the Nikon annual photomicrography competition? Lots of inspiration is there, albeit little help on techniques - eg https://www.nikonsmallworld.com/galleries/2019-photomicrography-competition and https://www.nikonsmallworld.com/galleries/2019-photomicrography-competition/crystallized-amino-acids-l-glutamine-and-beta-alanine-1
  Posted: 07/08/2024 08:02:08
Operating a microscope is a skill in itself. I bought a couple of microscope objectives (4x and 10x) and used them with a bellows unit. Much harder than I'd expected! I asked questions on a microscope forum, and they took pity on me and explained some basics like Numerical Aperture. It all sounded backwards to me. Are you trained in microscopy? If so, I have lots of questions for you!
  Posted: 07/08/2024 19:45:24
Despite this, it sounds like a difficult photograph to get, so kudos! I think you've nailed the capture! You said you focus-stacked, but would you have to if you shot straight down (on a flat/level plane)?   Posted: 07/09/2024 15:29:48