Search found 77 matches

by Geopressure
Sun Jul 26, 2020 9:15 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: minerals from Slovakia
Replies: 10
Views: 1261

Re: minerals from Slovakia

These are very nice, though I agree that the out of focus foreground on the metatorbernite is distracting.
by Geopressure
Tue Jul 14, 2020 8:16 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Filaments in agate
Replies: 4
Views: 384

Re: Filaments in agate

Thanks Jurkovicovic, I appreciate it!
by Geopressure
Mon Jul 13, 2020 4:11 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Female Jumping Spider (on Chrysocolla-encrusted Mixite)
Replies: 6
Views: 777

Re: Female Jumping Spider (on Chrysocolla-encrusted Mixite)

Great image and I love the spider's contrast with the Chrysocolla! Also enjoyed your lighting description.
by Geopressure
Mon Jul 13, 2020 3:44 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Filaments in agate
Replies: 4
Views: 384

Re: Filaments in agate

Good idea Saul..there may be more to see here. I need to give it a try.
by Geopressure
Mon Jul 13, 2020 9:28 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Filaments in agate
Replies: 4
Views: 384

Filaments in agate

These filaments are probably composed of an iron mineral..floating in solid, translucent silica. Sometimes called "moss". A curious form that most people don't associate with minerals.

Short stack at 5X
FOV 3mm
by Geopressure
Tue Jun 09, 2020 6:56 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Goethite in Quartz
Replies: 8
Views: 860

Thanks RoxnDox..glad you approve!
by Geopressure
Tue May 26, 2020 4:33 pm
Forum: Equipment Discussions
Topic: 24MP Canon Cameras
Replies: 2
Views: 526

I have been using the T7i for stacking with good results. No issues. Can't comment on the other models.
by Geopressure
Tue May 26, 2020 10:18 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Tourmaline on Lepidolite
Replies: 0
Views: 536

Tourmaline on Lepidolite

I really like lithium bearing minerals..had to crop this one quite a bit and re-sharpen for posting. I believe the specimen is from California.

Stacked at 5X
FOV 2.5mm



Image
by Geopressure
Wed May 20, 2020 3:40 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Goethite in Quartz
Replies: 8
Views: 860

Physicsmajor: As to the lighting..I was fortunate in that the crystals are somewhat parallel. This allowed me to use a diffused, but still rather directional LED light source oriented to minimize any specular reflections. This did create some shadows but it worked out OK. Nice uniform lighting tende...
by Geopressure
Tue May 19, 2020 6:38 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Goethite in Quartz
Replies: 8
Views: 860

Glad you liked it, PhysicsMajor. This is actually from a small agate nodule. When I sawed it open it happened to have a hollow center with the Goethite as a bonus. You are correct that this was shot using a 5X microscope objective with a tube lens mounted on a DSLR. It's always good to meet another ...
by Geopressure
Tue May 19, 2020 1:53 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Goethite in Quartz
Replies: 8
Views: 860

Goethite in Quartz

It's been a while since my last post..here is a spray of Goethite (tentative ID) with Quartz. They grew inside an agate geode from Argentina. Nothing like trying to illuminate something in a cavity. Under the scope these Goethite crystals tend to either look like silver mirrors or black, so this ima...
by Geopressure
Thu Feb 13, 2020 2:52 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Petroleum Quartz
Replies: 4
Views: 1041

A pretty shot, and interesting..where is the specimen from?
by Geopressure
Wed Oct 09, 2019 9:14 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Veszelyite
Replies: 5
Views: 1136

Thanks to all for the nice comments.

For lighting I used flexible LED lamps with two nested plastic diffusers..this one was easy because the subject is not highly reflective.
by Geopressure
Sun Oct 06, 2019 2:27 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Veszelyite
Replies: 5
Views: 1136

Veszelyite

(Cu,Zn)2Zn(PO4)2 ยท 2H2O

From Laochang Mine, Yunnan, China

Stacked at 5X, FOV 4.1mm

The image might have had more impact at 10X, but I liked the distribution of crystals in different orientations...


Image
by Geopressure
Wed Aug 14, 2019 2:28 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Twinned Cerussite
Replies: 8
Views: 1638

Thanks to all for the positive comments. I do love this material. As to over-sharpening, I didn't do anything unusual...not to say it's impossible.

I did not check it under UV but I will :)