Search found 1635 matches

by Cactusdave
Thu May 03, 2018 1:15 pm
Forum: Photography Through the Microscope
Topic: Some puzzling crystals
Replies: 5
Views: 1565

I suppose Pau's obscure Australian tree alkaloid is a definite possibility. That's exactly the kind of thing the Victorian slide makers liked, but it's supposed to be colourless unless reacted with strong acids. Images of sections of porphyry minerals from the web don't look anything like my specime...
by Cactusdave
Thu May 03, 2018 12:53 pm
Forum: Nature Photography -- Macro and Close-up
Topic: A few nivicolous myxomycetes..
Replies: 18
Views: 13709

Thanks, that's very helpful.
David
by Cactusdave
Thu May 03, 2018 12:51 pm
Forum: Photography Through the Microscope
Topic: Down the rabbit hole! -- Ammonite Tragophylloceras
Replies: 9
Views: 1704

Yes this is a small pyritised polished fossil ammonite from the Jurassic coast in the UK, identified by the eBay vendor as Tragophylloceras. The entire specimen is 15mm wide and the field width in the stereo image is 3mm. The image was taken with a Leitz Plan X2.5 objective and is a Zerene DMap stac...
by Cactusdave
Thu May 03, 2018 1:28 am
Forum: Photography Through the Microscope
Topic: Down the rabbit hole! -- Ammonite Tragophylloceras
Replies: 9
Views: 1704

Thanks Pau. You are spot on! I knew someone would recognise this straight away. It was difficult to find an ammonite small enough for this approach. I'll add some more pictures later.
by Cactusdave
Thu May 03, 2018 1:26 am
Forum: Photography Through the Microscope
Topic: Some puzzling crystals
Replies: 5
Views: 1565

Some puzzling crystals

This is a quiz I don't know the answer to myself. I bought this interesting slide on eBay. It has some pretty red crystals and a rather enigmatic label. First a rather bad macro shot of the subject and one of the label. http://www.photomacrography.net/forum/userpix/718_IMG_9358_1.jpg http://www.phot...
by Cactusdave
Thu May 03, 2018 12:50 am
Forum: Photography Through the Microscope
Topic: Down the rabbit hole! -- Ammonite Tragophylloceras
Replies: 9
Views: 1704

Down the rabbit hole! -- Ammonite Tragophylloceras

Looks like the door at the end is firmly closed, but do you know who owned this desirable residence? I don't want to give details like magnification or field size at this stage, as it would be a pretty big clue. To me it seems ridiculously easy, but then I know the answer :lol: I'm sure someone here...
by Cactusdave
Sun Apr 29, 2018 6:26 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Nikon Microphot. DIC Sénarmont
Replies: 25
Views: 6162

As far as image size is concerned you can post much larger photos on the forum than your two samples. First, make sure that your image dimensions are 1024 pixels or smaller, on both axes, AND that the image file length is 300 KB or smaller. Use your favorite photo editor to resize the image and set ...
by Cactusdave
Sun Apr 29, 2018 6:12 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Looking for help with specimen contrast / lighting
Replies: 15
Views: 4892

For diffusion I suggest you try a suitable sized cylinder of paper. Tracing paper is a good place to start, but it is worth experimenting with alternatives. If it eats too much light the answer should be more light. Diffusion is pretty much always important with incident lighting. It looks like you ...
by Cactusdave
Sun Apr 29, 2018 6:00 am
Forum: Nature Photography -- Macro and Close-up
Topic: A few nivicolous myxomycetes..
Replies: 18
Views: 13709

I have the same camera as you and recently acquired the same 60mm macro lens. I haven't tried the combination yet and I would very much appreciate it if you could post the camera and lens settings you are using to get the stunning field macro stacks.
David
by Cactusdave
Sat Apr 28, 2018 9:32 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Looking for help with specimen contrast / lighting
Replies: 15
Views: 4892

What does "eksplantat" mean?. I'm guessing Johny M means explant, in other words in vitro cultivation of a part of the plant in an agarose medium. There seems to be a surprising amount of noise in the images as well as some overexposure and lack of contrast that could be improved in post processing...
by Cactusdave
Sat Apr 14, 2018 4:17 am
Forum: Photography Through the Microscope
Topic: Solea solea Scale
Replies: 7
Views: 1660

Fish scales make great subjects for polarised light. Scales from Solea are a classic.

http://www.photomacrography.net/forum/v ... 020#182020

Salmon scales from your dinner are also very good, though they may need a bit of a clean.
by Cactusdave
Sat Apr 14, 2018 4:10 am
Forum: Photography Through the Microscope
Topic: Tondenti Spumam crater
Replies: 6
Views: 1534

Tondenti Spumam
I'm translating that as 'shaving foam'. Is that correct? :lol:
by Cactusdave
Fri Apr 13, 2018 7:09 am
Forum: Photography Through the Microscope
Topic: Paramecium caudatum
Replies: 13
Views: 2789

My thanks too Michael. You are lucky to have the combination of a really powerful light source and a camera with an excellent high ISO performance. Great work, and proves it is possible to get this kind of image without flash.
by Cactusdave
Fri Apr 13, 2018 7:04 am
Forum: Photography Through the Microscope
Topic: A Study in Scarlet aka There Will be Blood - images added
Replies: 17
Views: 5305

Thanks micro_pix and eward1897. Comments like these are really appreciated and make, what is very much a labour of love, worthwhile. :D Just like to repeat this for anyone who is interested in the content of this thread and may have missed it: As an aside I have a number of other injected and corrod...
by Cactusdave
Thu Apr 12, 2018 12:20 am
Forum: Photography Through the Microscope
Topic: Paramecium caudatum
Replies: 13
Views: 2789

Beautiful, I'd like to repeat micro_pix's question
How do you get 1/2000 sec with no flash in DIC with a 40X objective? It is very impressive.
Only I was thinking "How the expletive do you get ..... etc". :shock: :D