www.photomacrography.net :: View topic - Manganite
www.photomacrography.net Forum Index
An online community dedicated to the practices of photomacrography, close-up and macro photography, and photomicrography.
Photomacrography Front Page Amateurmicrography Front Page
Old Forums/Galleries
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 
Manganite

 
Post new topic   Reply to topic    www.photomacrography.net Forum Index -> Technical and Studio Photography -- Macro and Close-up
View previous topic :: View next topic  
Author Message
Geopressure



Joined: 26 Mar 2017
Posts: 71
Location: Nashville, TN

PostPosted: Fri May 17, 2019 2:28 pm    Post subject: Manganite Reply with quote

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 under a scope. Reflected images of adjacent crystals are a common issue (as seen in the upper right).


Back to top
View user's profile Send private message
rjlittlefield
Site Admin


Joined: 01 Aug 2006
Posts: 20652
Location: Richland, Washington State, USA

PostPosted: Fri May 17, 2019 4:59 pm    Post subject: Reply with quote

This is a good image, but I can well imagine the subject would not look like this in normal lighting.

Have you tried using illumination that is sort of "in between" normal and fully diffused?

What I'm thinking of is well diffused but small from the standpoint of the subject. For the subject "looking up", the lighting will be one or more bright disks in a dark sky.

By changing the size of the disk(s), or distance from the subject, you can tune the hardness of illumination. Facets will be bright only if they reflect one of disks. But because the disks are extended sources, they will still enable soft edges on the out-of-focus blurs, which should at least reduce the artifacts that impede stacking with point sources.

--Rik

Edit: tweaked wording


Last edited by rjlittlefield on Sat May 18, 2019 3:48 pm; edited 1 time in total
Back to top
View user's profile Send private message Visit poster's website
soldevilla



Joined: 16 Dec 2010
Posts: 570
Location: Barcelona, more or less

PostPosted: Sat May 18, 2019 2:14 pm    Post subject: Reply with quote

I know the difficulties of photographing minerals with very reflective facets (and which are the ones we like the most). I like the control of brightness that you have achieved, sometimes it is really impossible to achieve the appearance, brightness and transparency of some minerals.
Back to top
View user's profile Send private message
Geopressure



Joined: 26 Mar 2017
Posts: 71
Location: Nashville, TN

PostPosted: Sun May 19, 2019 11:00 am    Post subject: Reply with quote

At times it does seem impossible to achieve the desired results with certain minerals.

Rik: I will play around with your idea and see how it goes..Thanks.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    www.photomacrography.net Forum Index -> Technical and Studio Photography -- Macro and Close-up All times are GMT - 7 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group