Search found 84 matches

by Geopressure
Fri May 17, 2019 2:28 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Manganite
Replies: 3
Views: 1516

Manganite

Identified as Manganite on Calcite, Hotazel, S. Africa Stacked at 6.75X FOV 2.4mm (cropped) Under normal lighting these crystal faces tend to be either brilliant mirrors, or dead black. Diffuse lighting allows a decent stack, but also fails to reproduce the mineral as usually perceived by the eye un...
by Geopressure
Wed May 15, 2019 8:23 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Wavellite
Replies: 3
Views: 1584

I agree, this is a surprisingly clean result for this tough subject..good job.
by Geopressure
Tue May 07, 2019 3:46 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Malachite on Chrysocolla
Replies: 9
Views: 1947

Thanks all..lighting is a constant challenge for me at least. Some colorful, ultra-reflective minerals seem to defy all attempts to get a good stack. Diffusion has it's limitations. I may need to test using polarizers as Lou Jost has nicely described. Sorry, no locality information about this specim...
by Geopressure
Fri May 03, 2019 7:24 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Malachite on Chrysocolla
Replies: 9
Views: 1947

Good catch Saul..there is a lot of variability in the appearance/color of some minerals and Chrysocolla is just a guess here. I wasn't given that information with the specimen and I don't have a locality either. Perhaps someone else will recognize this material :)
by Geopressure
Fri May 03, 2019 4:33 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Malachite on Chrysocolla
Replies: 9
Views: 1947

Malachite on Chrysocolla

Stacked at 6.75X
FOV 3.2mm

I decided to leave the broken edge in the frame for interest..



Image
by Geopressure
Fri May 03, 2019 4:01 pm
Forum: Photography Through the Microscope
Topic: Mugshots
Replies: 8
Views: 2004

Love the midge!
by Geopressure
Sun Apr 28, 2019 10:04 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Crocoite
Replies: 10
Views: 2503

That seedpod example is impressive. There are a number of colorful yet highly reflective minerals that are problematical and might benefit from this approach. Thanks for sharing Lou!

Brad
by Geopressure
Sat Apr 27, 2019 2:22 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Crocoite
Replies: 10
Views: 2503

Thanks to all for the feedback! Lou: I agree the reflections are a bit stronger than desired. It is ironic, since reflections are often part of what makes larger mineral specimens attractive when examined by eye and moved around in the hand. I have never tried using polarizing filters though I've wo...
by Geopressure
Mon Apr 22, 2019 1:22 pm
Forum: Nature Photography -- Macro and Close-up
Topic: Fly, dewy morning
Replies: 5
Views: 2037

Great shots..love the dew!
by Geopressure
Sun Apr 21, 2019 3:47 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Crocoite
Replies: 10
Views: 2503

Crocoite

Crocoite from Tasmania

Stacked at 6.75X
Field of View 3.2 mm

Editing this one nearly wore me out and still not done...

Image
by Geopressure
Thu Apr 18, 2019 8:13 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Hemimorphite with Aurichalcite and Mimetite
Replies: 5
Views: 1792

Thanks to all for the comments..it's great to have this forum to share images.
by Geopressure
Wed Apr 17, 2019 11:02 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Hemimorphite with Aurichalcite and Mimetite
Replies: 5
Views: 1792

Hemimorphite with Aurichalcite and Mimetite

Specimen is from the 79 Mine, Gila Co., AZ. Some of my favorite material...

Stack was shot at 10X
F.O.V. 2 mm

Image
by Geopressure
Mon Apr 15, 2019 6:26 pm
Forum: Equipment Discussions
Topic: Another modified Wemacro stand
Replies: 16
Views: 5899

Lou or Ray: Are there any disadvantages to using the Micro-Mate, other than it being slow with very small step sizes? I see that it requires a little more room, but other than that it sounds pretty appealing. In my setup the rail could be replaced with some type of solid block spacer (in order to ma...
by Geopressure
Sun Apr 14, 2019 7:58 pm
Forum: Equipment Discussions
Topic: Another modified Wemacro stand
Replies: 16
Views: 5899

OK I see my error now...reading the numbers on the dial instead of counting the actual tic marks! Thanks Rik and Pau.
by Geopressure
Sun Apr 14, 2019 4:29 pm
Forum: Equipment Discussions
Topic: Another modified Wemacro stand
Replies: 16
Views: 5899

Thanks Pau, but I found an Olympus CHBS manual online and oddly each division is actually 2.5 microns, or 500 microns per revolution. In this case WeMacro gives the minimum step size as 0.23 micron.