Search found 20011 matches

by rjlittlefield
Thu Apr 11, 2024 11:40 am
Forum: Equipment Discussions
Topic: No sharpness when using mitutoyo 10x (also halo, low contrast)
Replies: 16
Views: 669

Re: No sharpness when using mitutoyo 10x (also halo, low contrast)

I think i solve the problem witch was the light control from the back. It seems that the HR is much more sensitivie for it. I spend couple days to have more controled light and below are results ... 10:1 HR by Radoslaw DIY , on Flickr Thanks for the update. I downloaded the maximum resolution image...
by rjlittlefield
Thu Apr 11, 2024 10:35 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: rotating worms
Replies: 4
Views: 478

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...
by rjlittlefield
Thu Apr 11, 2024 10:29 am
Forum: Nature Photography -- Macro and Close-up
Topic: closeup photo of solar eclipse in Richland, WA
Replies: 0
Views: 134

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...
by rjlittlefield
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: 896

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...
by rjlittlefield
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: 896

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.....
by rjlittlefield
Tue Apr 09, 2024 6:35 pm
Forum: Nature Photography -- Macro and Close-up
Topic: Neottia cordata (Heartleaf twayblade orchid)
Replies: 15
Views: 263

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
by rjlittlefield
Tue Apr 09, 2024 3:37 pm
Forum: Equipment Discussions
Topic: Zerene - Question
Replies: 3
Views: 179

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 "...
by rjlittlefield
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: 365

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...
by rjlittlefield
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: 365

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'...
by rjlittlefield
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: 365

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...
by rjlittlefield
Fri Apr 05, 2024 3:05 pm
Forum: Equipment Discussions
Topic: Any good 15x objectives?
Replies: 8
Views: 380

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...
by rjlittlefield
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: 142

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...
by rjlittlefield
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: 155

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...
by rjlittlefield
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: 155

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, ...