Search found 20025 matches
- Thu Apr 11, 2024 10:35 am
- Forum: Technical and Studio Photography -- Macro and Close-up
- Topic: rotating worms
- Replies: 4
- Views: 580
Re: rotating worms
Well the stationary pixels or dust particles are always in the same spot so naturally they will produce an artificial "line" in space during stacking. With a rocking stereo the application basically assumes this "line" exists and will animate it like the rest. Just so, and well said! Also important...
- Thu Apr 11, 2024 10:29 am
- Forum: Nature Photography -- Macro and Close-up
- Topic: closeup photo of solar eclipse in Richland, WA
- Replies: 2
- Views: 303
closeup photo of solar eclipse in Richland, WA
PXL_20240408_185833738_crop.jpg Here in Washington State the solar eclipse was only partial, max coverage about 37%. I don't have any equipment suitable for pointing at the sun, but I do have some window shades with little holes that make pretty good pinhole cameras. Most of the time they just show...
- Wed Apr 10, 2024 1:31 pm
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: Methods to evaluate performance of a focus rail
- Replies: 10
- Views: 953
Re: Methods to evaluate performance of a focus rail
Wich is yours? It is labeled only "aus JENA", but somehow I figured out that it's a Laboval 2. As of today, Google Image search for aus jena laboval 2 shows many images that look right. Oddly, the #2 hit is from my own website, where long ago I posted some notes about rehabbing the focus block. See...
- Wed Apr 10, 2024 9:24 am
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: Methods to evaluate performance of a focus rail
- Replies: 10
- Views: 953
Re: Methods to evaluate performance of a focus rail
The total displacement of 120mm (not 140mm as I wrote) that the rail travels is equivalent to six and a half turns of the buttons, which when divided gives 18.46. Isn't there anything missing here? I don't think that you (or Pau :wink:) have missed anything very important. But adding some details.....
- Tue Apr 09, 2024 6:35 pm
- Forum: Nature Photography -- Macro and Close-up
- Topic: Neottia cordata (Heartleaf twayblade orchid)
- Replies: 15
- Views: 291
Re: Neottia cordata (Heartleaf twayblade orchid)
Really nice set!
That scale shot at the end adds hugely to my pleasure in going back to study the closeup portrait.
--Rik
That scale shot at the end adds hugely to my pleasure in going back to study the closeup portrait.
--Rik
- Tue Apr 09, 2024 3:37 pm
- Forum: Equipment Discussions
- Topic: Zerene - Question
- Replies: 3
- Views: 201
Re: Zerene - Question
The above explanation is correct as far as it goes, but there may be another complicating factor. Sometimes the alignment process can be led astray by asymmetry in how the subject appears to change shape and size as it goes in and out of focus, with the result that the alignment process introduces "...
- Sun Apr 07, 2024 10:19 pm
- Forum: Technical and Studio Photography -- Macro and Close-up
- Topic: cross-sections of MLCCs (multi-layer ceramic capacitors)
- Replies: 12
- Views: 563
Re: cross-sections of MLCCs (multi-layer ceramic capacitors)
the depth on the stereo photo is quite large Well, it's easily seen. But in terms of Zerene Stacker's controlling value, stereo shift for the above image is only plus and minus 3.6%, barely larger than the default value of plus and minus 3.0%. If I had not told you that the shift percentage corresp...
- Sat Apr 06, 2024 4:49 pm
- Forum: Technical and Studio Photography -- Macro and Close-up
- Topic: cross-sections of MLCCs (multi-layer ceramic capacitors)
- Replies: 12
- Views: 563
Re: cross-sections of MLCCs (multi-layer ceramic capacitors)
I'm glad you found it interesting. I certainly was not expecting that last step of strange structure with the 10 pF size. My brain is now toying with the idea of some sort of automated sand-and-shoot setup that could make a time-lapse of sectioning its way through the whole structure. Probably that'...
- Fri Apr 05, 2024 5:20 pm
- Forum: Technical and Studio Photography -- Macro and Close-up
- Topic: cross-sections of MLCCs (multi-layer ceramic capacitors)
- Replies: 12
- Views: 563
cross-sections of MLCCs (multi-layer ceramic capacitors)
Just to set the stage, here's what we're talking about. https://janrik.net/MiscSubj/2024/MultiLayerCeramicCapacitors_20240404/IMG_4336.jpg These are small ceramic capacitors that sell for about $0.025 each in retail boxes at Amazon. Across a couple of kits, they range in rating from 10 picofarads up...
- Fri Apr 05, 2024 3:05 pm
- Forum: Equipment Discussions
- Topic: Any good 15x objectives?
- Replies: 8
- Views: 406
Re: Any good 15x objectives?
And I wouldn’t want to push 20x down to 15x with a 150mm tube lens because I’m fairly certain edge performance would be terrible on FF. For what it's worth, my Mitutoyo M Plan Apo 20X NA 0.42 pushes down to 10X on APSC and the corners hold up OK. I searched the forum to see if anybody else had post...
- Fri Apr 05, 2024 2:45 pm
- Forum: Equipment Discussions
- Topic: Efficient diffuse macro lighting for SWD objectives
- Replies: 16
- Views: 663
- Wed Apr 03, 2024 8:50 am
- Forum: Administrator's Appreciation Gallery...Macro and Close-up Images
- Topic: Lens test wafer (RobertOToole)
- Replies: 4
- Views: 400
Re: Lens test wafer (RobertOToole)
but my comments seem more appropriate here. I agree -- no problems at all posting here. By the way, all credit to Pau for initially suggesting Robert for this month. The choice might seem obvious in retrospect. But the timing was only a day after we first heard of Robert's passing, and I for one wa...
- Tue Apr 02, 2024 5:03 pm
- Forum: Technical and Studio Photography -- Macro and Close-up
- Topic: Chrysoperla carnea (common Green Lacewing)
- Replies: 4
- Views: 181
Re: Chrysoperla carnea (common Green Lacewing)
This is in fact a dead lacewing, I picked it up on its wings with big flat tweezers, put it on a piece of paper and slightly pushed it against the rough surface until the legs grabbed onto it and positioned themselves somewhat naturally. Aha! So, a dead but fresh specimen being held in midair by tw...
- Tue Apr 02, 2024 2:48 pm
- Forum: Technical and Studio Photography -- Macro and Close-up
- Topic: Chrysoperla carnea (common Green Lacewing)
- Replies: 4
- Views: 181
Re: Chrysoperla carnea (common Green Lacewing)
Very nice! I'm curious how this was shot. Aside from the palp stuck to its eye, the subject appears to be in typical live position clinging to a glass sheet that it was photographed through. But I'm having trouble imagining a green lacewing holding still enough to shoot so many frames manually. So, ...
- Mon Apr 01, 2024 1:49 pm
- Forum: Photography Through the Microscope
- Topic: Diatoms - Coscinodiscus marginatus and Eupyxidicula sp.
- Replies: 5
- Views: 364
Re: Diatoms - Coscinodiscus marginatus and Eupyxidicula sp.
Really nice!
Am I correct in thinking that only the diatoms are SEM images, while the base, back, and shadows are synthetic?
--Rik
Am I correct in thinking that only the diatoms are SEM images, while the base, back, and shadows are synthetic?
--Rik