Fossil Diatoms from Newport Beach

Images made through a microscope. All subject types.

Moderators: rjlittlefield, ChrisR, Chris S., Pau

Frez
Posts: 150
Joined: Sat Feb 02, 2008 10:14 am

Fossil Diatoms from Newport Beach

Post by Frez »

Hello everyone. The Newport Beach deposit has a good diversity of specimens and the occasional rarity. The Glyphodiscus stellatus was a nice find and something I had never seen. It was imaged in BF and Hoffman Modulation. HMC does not work well with most diatoms. In this case it reveals surface detail with naturally occurring height variations due to its shading ability. The Aulacodiscus affinis has nine out of ten perfect Rimoportulae and is a fine example.

The camera used is a Olympus DP-10 with an Optem .67 relay. The scope is an Olympus BHA. Stacking was done with either Helicon Focus or CombineZP.

Thanks and best of luck to all
Frez

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Pau
Site Admin
Posts: 6120
Joined: Wed Jan 20, 2010 8:57 am
Location: Valencia, Spain

Post by Pau »

Excellent images!
Pau

Jacek
Posts: 5360
Joined: Sun Oct 02, 2011 7:00 am
Location: Poland

Post by Jacek »

Beautiful, fifth picture which is a technique?

Frez
Posts: 150
Joined: Sat Feb 02, 2008 10:14 am

Post by Frez »

Jacek wrote:Beautiful, fifth picture which is a technique?
Hi Jacek. The technique is called Hoffman Modulation Contrast.
http://www.olympusmicro.com/primer/tech ... ffman.html

Thanks
Frez

Cactusdave
Posts: 1631
Joined: Tue Jun 09, 2009 12:40 pm
Location: Bromley, Kent, UK

Post by Cactusdave »

Classic pictures. Excellent halo-free stacking, crisp detail and clean backgrounds. The Olympus DP-10 was a highly innovative camera for its day and its modest pixel count is no disadvantage at these high magnifications.
Leitz Ortholux 1, Zeiss standard, Nikon Diaphot inverted, Canon photographic gear

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