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Tony Peterson's mindat.org Home Page

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Tony Peterson's Mindat Home Page

Registered member since 24th Dec 2005

Tony Peterson has uploaded:
5537 Mineral Photos
55 Locality Photos
10 Other Photos

Tony Peterson has published 2 articles on mindat.org
 
In 2006 when I began contributing photos to Mindat, I used Olympus E300 and E330 cameras with a Zuiko 50mm 1:2 macro lens. The lens remains very good but the Olympus cameras by current standards are noisy and lo-res. I added the Canon MPE-65 macro lens on an XSi body some years later; that camera's shutter finally broke and I temporarily replaced it with a Canon T5i. I was using a Manfrotto macro rail with a stepper motor designed to be used for telescope focussing for my micro shots (minimum FOV=4 mm). This was a very analog, hands-on setup!

Finally, I have graduated to more cutting-edge gear by acquiring a Canon 6D, a 100 mm macro lens, and a Stackshot focussing rail in late 2015. The 6D is a full-frame camera and the pixel size is larger than the T5i. However, the sensor resolution still exceeds the optical resolution of my MPE-65 lens and, with the much lower noise of the 6D and the ability to employ mirror lockup provided by the Stackshot rail, there is a noticeable improvement in the detail of individual images. Image stacking is improved due to the lower noise. So even though my minimum FOV with the 6D is now 7 mm, a cropped image is still more detailed than I could obtain with the APS sensor cameras.

I have used more than one stacking program and I'm sticking to Zerene Stacker right now, it works particularly well for high-contrast micro work, and for generating stereo pairs.

About stereo images....... At the least, a stereo version helps the viewer to appreciate textural relations and crystal forms, and so is technically useful. At best, stereo pairs are dynamic and beautiful visualizations, and are the only means to accurately depict for example, inclusions in transparent minerals. The principal difficulties in obtaining quality stereo pairs from stacking programs are, that a large number of images is required, and the initial result nearly always requires some touchup. The out-of-focus backgrounds (less often foregrounds) are flat and have the appearance of painted stage scenery.

I hope you enjoy my Mindat gallery! My avatar is a photo of a pair of rock hyraxes I encountered on the way up Mount Kenya in 1986.

last edited November 29, 2015.


Messaging Statistics

Total messages posted:447
New threads started:96
First message posted:8th Jan 2006
Latest message posted:2nd Sep 2020

My Latest Discussions and Replies

7walternative interpretationPosted by Tony Peterson. 2 replies in Photos.Feb 2020rock detailsPosted by Tony Peterson. 3 replies in Photos.Jan 2020Large augite from Kibo?? Must be anorthoclasePosted by Tony Peterson. 3 replies in Photos.Dec 201922 imagesworst photo on MindatPosted by Tony Peterson. 66 replies in Mineral Photography.Oct 2019locating rock and singleton mineral specimens on mapsPosted by Tony Peterson. 4 replies in Improving Mindat.org.Oct 2019granites and the nature of proofPosted by Tony Peterson. 8 replies in Photos.Sep 2019PotD is not scoriaPosted by Tony Peterson. 5 replies in Improving Mindat.org.Jan 2019Sodalite Group - Stradner Kogel, Wilhelmsdorf, Bad Gleichenberg, Styria, AustriaPosted by Tony Peterson. 9 replies in Photos.Dec 2018fluorescent/halogen overlays in photos - can do?Posted by Tony Peterson. One reply in Mineral Photography.May 2018errors in Oldoinyo Lengai picsPosted by Tony Peterson. 10 replies in Improving Mindat.org.Jan 2018our description of fenite is too restrictivePosted by Tony Peterson. 9 replies in General.Dec 2017Fluorapatite - Siglo Veinte Mine, Llallagua, Rafael Bustillo Province, Potosí Department, BoliviaPosted by Tony Peterson. 5 replies in Photos.Nov 2017POTD...........why?Posted by Tony Peterson. 16 replies in General.Nov 2017locality help: Peruvian chalcopyrite/rhodochrositePosted by Tony Peterson in Identity Help.Nov 2017from Katanga: malachite or brochantite?Posted by Tony Peterson. 3 replies in Identity Help.Nov 2017minerals at San Teodoro, AlmadenPosted by Tony Peterson. 2 replies in General.Aug 2017Mount Kenya, Mount Kenya National Park, Eastern Province, KenyaPosted by Tony Peterson. One reply in Photos.Jul 2017upgrades needed to rock databasePosted by Tony Peterson. 20 replies in Improving Mindat.org.Apr 2017unknown Llallagua bright yellowPosted by Tony Peterson. One reply in Identity Help.Dec 2016unknowns in Mount Malosa specimenPosted by Tony Peterson. 7 replies in Identity Help.

 
 
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