Ah :smt023 , I couldn't see why you'd use 3 pots in parallel !! Could be a nice challenge for students to work out the result :) Chris, Yes, the timer would be a good circuit for your students to work out. The output current mode operation is more involved but not that difficult if you don't includ...

Looks good. It should be possible to place a lump of amluminum in the head.. I don't understand the circuit sysmbols eg at R20, R21, R22. They're not all pots... ?? Chris, Yes, these are just various types of pots so one have a choice. Some can have proper knobs, others require a screwdriver, some ...

This looks like a very interesting project. That said, and not to be lame, but it seems like a 150w halogen light source with a fiber optic gooseneck might be a sensible option at that point. Agree, actually that's a better solution! However, I don't have a 150w halogen source, and have 4 Jansjo li...

Some reference posts related to the LED use. https://www.photomacrography.net/forum/viewtopic.php?t=41353 https://www.photomacrography.net/forum/viewtopic.php?t=40999&postdays=0&postorder=asc&start=30 Had a IKEA Jansjo LED light clamp break, decided to look at the possibility of modifying the base t...

Update on this Godox LED light. Below are images of the light disassembled to study the design. Note the case is a heavy extruded aluminum frame and the massive copper cored heat sink the LED COB directly mounts on. The copper core resides inside a larger 90mm diameter finned heatsink which has a 95...

Another option worth considering that works with the iMac & PC like the Stackshot, and also Smartphones, is the Wemacro Rail, probably one of the better overall values in focus stacking rails available.

Best,

Rik,

Interesting paper from 2002.

http://www.imaging.org/site/PDFS/Papers ... 7/7120.pdf

Best,

Thanks Rik, was thinking this zigzag as result of hot pixel, not a post processing function.

Best,

Isn't the "zigzagged" caused by a hot pixel that is fixed in the sensor? If, so then each image would not have a zigzag but only a a hot pixel at a fixed location in the sensor. The zigzag is the result of stacking, thus zigzag correction should NOT be applied to each image, only to the image render...

Looks like a great location (except maybe traffic induced vibration) with lots of access within walking distance.

Good luck and stay safe.

Best,

...We did a quick "hands on" test here that required 1.6 seconds exposure of a 220 lumen LED illumination for proper exposure, so for a 10ms exposure would require 35200 lumens... Hi Mike, How are you measuring lumens ? Hi Saul, This is from the specification on the light, then somewhat confirmed b...

This seems OK, at a quick glance. Agree an interesting result. As you've noted everything depends on lambda, the wavelength of light, which is constant regardless of the subject, lens or sensor/pixel size. Lambda does vary with color and material medium tho. This is why electron microscopes have suc...

We've received the Godox 150W 16,000 lumen 5600K LED Video light here at Mike's Labs, and did some quick tests to verify the output. This is the brightest continuous source light I've ever seen, like looking at a Xeon strobe that is continuous!! This light is a standard studio type mount and uses th...

...pn diode junction can be used with a DVM as a crude light meter ... Yep, during soviet occupation we had very limited electronic part supply - so , instead sensors we used Russian transistors , filed their cap tops off...it was better than photo resistors (which you couldn't get also). Interesti...

Saul, I've found that any pn diode junction can be used with a DVM as a crude light meter in a pinch. LEDs work well because they have a large pn diode junction, a silicon diode like the 1N4148 also works but not as sensitive as the LEDs. I checked a few clear, red, amber, green & blue 5mm LEDs, the...