Search found 69 matches
- Mon Dec 19, 2016 9:47 pm
- Forum: Equipment Discussions
- Topic: Mitakon 20mm f/2 4.5X Super Macro Lens
- Replies: 50
- Views: 17632
- Sat Nov 26, 2016 1:03 pm
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: Best Photoshop spot removal options for stacking?
- Replies: 19
- Views: 6661
. . . a new-ish program for Mac OS (not sure if that is what you use). It is called Affinity Photo. Thanks, Asha. Affinity Photo sounds like excellent software, and I devoutly wish it wide acceptance. Adobe’s coercing users into eternal-payment bondage opened up a hole that I hope competitors will ...
- Wed Feb 03, 2016 9:18 am
- Forum: Equipment Discussions
- Topic: 3d printed linear stage
- Replies: 20
- Views: 8606
- Mon Feb 01, 2016 6:57 pm
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: Beating the diffraction limit
- Replies: 9
- Views: 2302
- Mon Feb 01, 2016 5:29 pm
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: Beating the diffraction limit
- Replies: 9
- Views: 2302
Rik, a couple more thoughts about the diffraction limit...at my work, we routinely use infrared wavelengths. Since diffraction physics is wavelength dependent, these systems reach the diffraction limit quite easily, even with optical mirrors that have visible machining marks which would destroy imag...
- Mon Feb 01, 2016 5:14 pm
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: Beating the diffraction limit
- Replies: 9
- Views: 2302
mawyatt, when I posted, I couldn't remember the name, but it is a micro-lithography lens. It is basically like a giant microscope objective used in reverse, and for very small features, they tend to use the blue to UV spectrum. I'm not even sure if the materials used for high UV transmission would p...
- Mon Feb 01, 2016 12:32 pm
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: Beating the diffraction limit
- Replies: 9
- Views: 2302
Yes, they don't claim to exceed the diffraction limit that I could see. They did address the issue of dispersion--they used a broadband laser to etch the features in the lens, and also did some testing to see if the flexible mounting material could be controlled to improve focus. Interesting tidbit ...
- Mon Feb 01, 2016 12:02 pm
- Forum: Equipment Discussions
- Topic: LED choice for video using microscope
- Replies: 23
- Views: 4034
Does the brightness (power) difference between the two emitters mean that the spectral response of the 6000K LED is shifted upwards compared to the lower power 3000K emitter? If so, would this mean that the CRI difference would effectively not be as great? By brightness (power) do you mean luminous...
- Mon Feb 01, 2016 11:37 am
- Forum: Equipment Discussions
- Topic: LED choice for video using microscope
- Replies: 23
- Views: 4034
I am wondering if the article should be read with caution--the camera he used has a Bayer filter (2 green, 1 red, 1 blue in a block pattern). Cameras with different kinds of sensor designs (eg a stacked sensor such as Foveon) may not behave the same way. This article should not be taken as universa...
- Mon Feb 01, 2016 11:31 am
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: Beating the diffraction limit
- Replies: 9
- Views: 2302
- Mon Feb 01, 2016 9:13 am
- Forum: Equipment Discussions
- Topic: LED choice for video using microscope
- Replies: 23
- Views: 4034
- Mon Feb 01, 2016 9:06 am
- Forum: Equipment Discussions
- Topic: LED choice for video using microscope
- Replies: 23
- Views: 4034
And here is an article on the same topic, but written from a bit different point of view - regular photography with daylight (high CRI and high color temperature light source). It gives certain illustrations of histograms without suppressed green and with it. In case of LEDs, we don't need to suppr...
- Sun Jan 31, 2016 8:26 pm
- Forum: Equipment Discussions
- Topic: LED choice for video using microscope
- Replies: 23
- Views: 4034
Thanks for your response, Bushman.K! Between yours and Rik's posts, plus my own experience, it seems to me that the shift in light temperature would be easily compensated for, without too much loss in the perceived color "truth". In addition, just thinking about the Planck curve for varying Kelvin, ...
- Sun Jan 31, 2016 6:23 pm
- Forum: Equipment Discussions
- Topic: LED choice for video using microscope
- Replies: 23
- Views: 4034
- Sat Jan 30, 2016 2:26 pm
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: Masking help
- Replies: 7
- Views: 1839
Here is a tutorial for masking hair in CS6, but this would work in other PS versions as well. The trick is to use the highest contrast channel, put the content into a spare channel, and boost contrast of the new channel with levels or curves. http://www.dummies.com/how-to/content/how-to-mask-hair-fu...