Search found 18514 matches

by rjlittlefield
Wed Oct 20, 2021 8:27 am
Forum: Nature Photography -- Macro and Close-up
Topic: From Czech meadows and groves III
Replies: 5
Views: 97

Re: From Czech meadows and groves III

Nicely done!

The abdominal shape of the wasp in #5 is new to me. What is that beast?

--Rik
by rjlittlefield
Tue Oct 19, 2021 3:03 pm
Forum: Equipment Discussions
Topic: Static Moment of single vs dual carriage rail
Replies: 8
Views: 165

Re: Static Moment of single vs dual carriage rail

How does Zerene (and I presume the competitors) deal with out-of-sequence or duplicate frames as would happen with the situation described above? A depth map would presumably be distorted with such errors, so that a 3D image would not rendered properly. But for 2D renderings, would there be any iss...
by rjlittlefield
Tue Oct 19, 2021 1:03 pm
Forum: Equipment Discussions
Topic: Static Moment of single vs dual carriage rail
Replies: 8
Views: 165

Re: Static Moment of single vs dual carriage rail

I'm not sure what Zerene would do for you in this regard. Maybe you or Rik could elaborate on the benefits of Zerene in a high vibration environment? Zerene Stacker has no special magic for dealing with vibrations. The alignment process of any stacking software should work equally well here. As men...
by rjlittlefield
Tue Oct 19, 2021 7:26 am
Forum: Equipment Discussions
Topic: Adding "spacer" between an infinite objective and tube lens
Replies: 17
Views: 382

Re: Adding "spacer" between an infinite objective and tube lens

Here is a MUST SEE video (to me) while playing with iris (thanks to ADi) placed in the "infinity space". A "MUST SEE" video if you have not seen what hypercentric effect is :D https://youtu.be/PtChcgA_cac That's a good demo. For explanation, see https://www.photomacrography.net/forum/viewtopic.php?...
by rjlittlefield
Mon Oct 18, 2021 5:38 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Calm Before The Storm
Replies: 2
Views: 105

Re: Calm Before The Storm

Nice! I like the way the clouds and light in the background play with the liquid in the foreground. It's the sort of image that might accompany a fantasy tale.

Electronic drop control & camera sync?

--Rik
by rjlittlefield
Mon Oct 18, 2021 1:27 pm
Forum: Photography Through the Microscope
Topic: TOSHIBA CK40378E061
Replies: 6
Views: 103

Re: TOSHIBA CK40378E061

Wow, these are spectacular colors! What's the technique?

--Rik
by rjlittlefield
Sun Oct 17, 2021 10:11 pm
Forum: Equipment Discussions
Topic: How good are alternatives (clones) to Mitutoyo lenses
Replies: 60
Views: 1406

Re: How good are alternatives (clones) to Mitutoyo lenses

Well, I certainly put my foot in it. I'm sorry, I didn't know; I meant no offense. :( Well, I for one am smiling. No offense taken, no apologies necessary. :D Here is a recent response that I gave to an interviewer regarding the question that you're asking: Periodically people ask me why they shoul...
by rjlittlefield
Sun Oct 17, 2021 8:10 pm
Forum: Equipment Discussions
Topic: How good are alternatives (clones) to Mitutoyo lenses
Replies: 60
Views: 1406

Re: How good are alternatives (clones) to Mitutoyo lenses

Were those mostly issues with chromatic aberration? I'd love to know what issues would be of most significance to look out for when inspecting the performance of an objective. The usual complaints that I see reported for used objectives are not CA, but lack of sharpness and related aberrations, oft...
by rjlittlefield
Sun Oct 17, 2021 8:03 pm
Forum: Equipment Discussions
Topic: Mitutoyo MPlan 5x vs Mitutoyo QV 2.5x Comparision
Replies: 29
Views: 398

Re: Mitutoyo MPlan 5x vs Mitutoyo QV 2.5x Comparision

I am a bit puzzled, usually if a sensor is spec'ed as 1/2 inch, it normally refers to diagonal dimension, then this (1/2 inch - 12.7mm) is a bit different from 8mm. From https://en.wikipedia.org/wiki/Image_sensor_format#Table_of_sensor_formats_and_sizes : Sensor sizes are expressed in inches notati...
by rjlittlefield
Sun Oct 17, 2021 4:19 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Hexamethyldisilazane (HMDS) -- a drying aid
Replies: 3
Views: 228

Re: Hexamethyldisilazane (HMDS) -- a drying aid

René, thanks for the comments and links. In searching the forum, I had noticed that you were the only person mentioning HMDS, so I had hoped you would add to this thread. The t-butanol technique is completely new to me. Quick search found what seems to be a good overview article at http://www.bio.um...
by rjlittlefield
Sun Oct 17, 2021 1:37 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: What is this fly with legs like a flea?
Replies: 19
Views: 687

Re: What is this fly with legs like a flea?

Megaselia scalaris Can it be the same specimen as this little fly that I captured in my house in Malaga (Spain) that was on an open melon? It was extremely small, as you can see on my hand I would bet pretty heavily that yours and mine are not the same species. For starters, yours has an obvious "c...
by rjlittlefield
Sun Oct 17, 2021 9:01 am
Forum: Equipment Discussions
Topic: Mitutoyo MPlan 5x vs Mitutoyo QV 2.5x Comparision
Replies: 29
Views: 398

Re: Mitutoyo MPlan 5x vs Mitutoyo QV 2.5x Comparision

RobertOToole wrote:
Sat Oct 16, 2021 9:40 pm
I did post the same images here on the forum but searching on the site and using google I cant bring up the post for some reason.
viewtopic.php?t=42949 ?

--Rik
by rjlittlefield
Sat Oct 16, 2021 6:58 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: What is this fly with legs like a flea?
Replies: 19
Views: 687

Re: What is this fly with legs like a flea?

I have a book on order: https://www.amazon.com/gp/product/041256520X "Scuttle Flies: The Phoridae" by H. Disney, 1994. Current list price $299 but out of stock. Amazon found me a copy in the UK for less than $30 including shipping. (No, they aren't offering any more for that price.) I'll report bac...
by rjlittlefield
Sat Oct 16, 2021 2:32 pm
Forum: Photography Through the Microscope
Topic: Linagilptin
Replies: 2
Views: 84

Re: Linagilptin

Linagilptin Nice crystals! I'm wondering, is the chemical perhaps "Linagliptin" ? (It's a slight spelling difference, and easily made. I was amused when searching to find that https://pubmed.ncbi.nlm.nih.gov/31811859/ says "linagilptin" in the title but not in the abstract, while the abstract has t...
by rjlittlefield
Sat Oct 16, 2021 10:46 am
Forum: Equipment Discussions
Topic: Mitutoyo MPlan 5x vs Mitutoyo QV 2.5x Comparision
Replies: 29
Views: 398

Re: Mitutoyo MPlan 5x vs Mitutoyo QV 2.5x Comparision

It feels like it shouldn't matter how much physical space there is in the infinity space but apparently it does in at least one system When thinking about telecentricity, calling that space "infinity" is a misleading over-simplification. It's important to realize that the space behind the objective...