Search found 17693 matches

by rjlittlefield
Sat Aug 01, 2020 4:55 pm
Forum: General Discussion Forum and Community Announcements
Topic: Why aren't flies blinded by the sun?
Replies: 6
Views: 145

Re: Why aren't flies blinded by the sun?

I have read quite a bit about fly eyes, but I do not recall ever seeing this specific issue addressed. Searching today, I found only that there is a "pupil" mechanism that limits light transfer to the receptors. "The fully light-adapted pupil diminishes the photoreceptor's acceptance angle by a fact...
by rjlittlefield
Sat Aug 01, 2020 4:06 pm
Forum: Administrator's Appreciation Gallery...Photography Through the Microscope
Topic: Megalopa stage of a developing crab (by micro_pix)
Replies: 0
Views: 41

Megalopa stage of a developing crab (by micro_pix)

The following image represents the winning thread for the August 2020 award for Micro. It was originally posted as image #4 at https://www.photomacrography.net/forum/viewtopic.php?t=42095 . We're reproducing it here, separately, as part of our procedure to provide clarity when the front page image w...
by rjlittlefield
Sat Aug 01, 2020 4:01 pm
Forum: Administrator's Appreciation Gallery...Macro and Close-up Images
Topic: Gymnosporangium rust (by Saul)
Replies: 0
Views: 41

Gymnosporangium rust (by Saul)

The following image represents the winning thread for the August 2020 award for Macro. It was originally posted at https://www.photomacrography.net/forum/viewtopic.php?t=41853 (image #1 of that thread). We're reproducing the image here, separately, as part of our procedure to provide clarity when th...
by rjlittlefield
Sat Aug 01, 2020 3:57 pm
Forum: Photography Through the Microscope
Topic: Administrators Appreciation Award Winners for August 2020
Replies: 0
Views: 39

Administrators Appreciation Award Winners for August 2020

We are pleased to announce this month's winners of the Administrators Appreciation Awards! :D In the Photomacrography Forums, we honor Saulius Gugis for his "Gymnosporangium rust", at https://www.photomacrography.net/forum/viewtopic.php?t=41853 . In the Photomicrography Forum, we honor David Kelly (...
by rjlittlefield
Sat Aug 01, 2020 3:55 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Administrators Appreciation Award Winners for August 2020
Replies: 0
Views: 49

Administrators Appreciation Award Winners for August 2020

We are pleased to announce this month's winners of the Administrators Appreciation Awards! :D In the Photomacrography Forums, we honor Saulius Gugis for his "Gymnosporangium rust", at https://www.photomacrography.net/forum/viewtopic.php?t=41853 . In the Photomicrography Forum, we honor David Kelly (...
by rjlittlefield
Sat Aug 01, 2020 3:54 pm
Forum: Nature Photography -- Macro and Close-up
Topic: Administrators Appreciation Award Winners for August 2020
Replies: 0
Views: 28

Administrators Appreciation Award Winners for August 2020

We are pleased to announce this month's winners of the Administrators Appreciation Awards! :D In the Photomacrography Forums, we honor Saulius Gugis for his "Gymnosporangium rust", at https://www.photomacrography.net/forum/viewtopic.php?t=41853 . In the Photomicrography Forum, we honor David Kelly (...
by rjlittlefield
Fri Jul 31, 2020 1:47 pm
Forum: Nature Photography -- Macro and Close-up
Topic: Egg Papilio machaon update I & update II
Replies: 25
Views: 557

Re: Egg Papilio machaon update I & update II

And a short video during breakfast. Klick for Video This looks like healthy feeding of a probably 2nd instar larva. ("2nd instar" is between first and second molts.) The earlier video, at https://www.youtube.com/watch?v=GWpVsyitBak , looked like defensive behavior of a caterpillar in its resting st...
by rjlittlefield
Thu Jul 30, 2020 7:33 am
Forum: Nature Photography -- Macro and Close-up
Topic: Egg Papilio machaon update I & update II
Replies: 25
Views: 557

Re: Egg Papilio machaon update I & update II

Nice image. This looks like the resting state between larval stages, where the caterpillar has grown as large as it can inside its current skin, and is taking a break from eating to grow a new skin and a new head capsule, inside the old skin and head. Soon it will split the skin in the front, the ol...
by rjlittlefield
Wed Jul 29, 2020 7:19 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Bumblebee mandible with golden hairs
Replies: 1
Views: 145

Bumblebee mandible with golden hairs

https://janrik.net/MiscSubj/2020/BumblebeeFromVet20200722/2020-07-28-20.39.59-ZS-retouched-small.jpg This specimen came to me for identification. It had been killed the previous day, after stinging a bee-sensitive person. The person's bad reaction had resolved well, but for future reference they wa...
by rjlittlefield
Wed Jul 29, 2020 11:22 am
Forum: Beginners Macro
Topic: microscope infinity optical system setup for wild bees macro photography?
Replies: 9
Views: 285

Re: microscope infinity optical system setup for wild bees macro photography?

Ichthyophthirius wrote:
Wed Jul 29, 2020 1:04 am
does anyone know the NA of the MP-E at 5x?
Wide open, NA 0.149 (effective f/16.8 at sensor).

--Rik
by rjlittlefield
Tue Jul 28, 2020 1:43 pm
Forum: Nature Photography -- Macro and Close-up
Topic: Macro lens advice
Replies: 6
Views: 269

Re: Macro lens advice

Emabrengi wrote:
Tue Jul 28, 2020 1:19 pm
Canon 100mm f/2.8 mkII
I do not recognize that name for a lens. I have the Canon EF 100mm f/2.8L Macro IS USM, which is excellent.

--Rik
by rjlittlefield
Mon Jul 27, 2020 12:00 pm
Forum: Nature Photography -- Macro and Close-up
Topic: Egg Papilio machaon update I & update II
Replies: 25
Views: 557

Re: Egg Papilio machaon update I & update II

Yes, that's the beast! Nicely shot. :D

--Rik
by rjlittlefield
Sun Jul 26, 2020 8:42 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Yellow Jacket
Replies: 5
Views: 165

Re: Yellow Jacket

could be Beauveria bassiana “Icing Sugar Fungus” or a similar fungus. Good idea, some sort of fungus does seem likely. It's impressive that Google search on icing sugar fungus turns up a #2 hit for https://en.wikipedia.org/wiki/Beauveria_bassiana , despite the fact that that article does not contai...
by rjlittlefield
Sun Jul 26, 2020 8:17 am
Forum: General Discussion Forum and Community Announcements
Topic: Dark fish
Replies: 5
Views: 147

Re: Dark fish

Hhmm... I notice the photo was taken with backlighting, and apparently there is plenty of light diffusing through the fish to make it appear only dark gray.

It seems an excellent image for showing the shape of the fish, but not very helpful for the ultra-black feature being discussed!

--Rik
by rjlittlefield
Sat Jul 25, 2020 9:18 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Yellow Jacket
Replies: 5
Views: 165

Re: Yellow Jacket

In the Helicon Focus menu system, take a look at "File > Remove all images". You can also select individual images and do File > "Remove image" to get rid of just those. These operations are also available in the right-click popup menu in the list of files.

--Rik