Search found 109 matches

by santiago
Sat Dec 01, 2018 1:30 pm
Forum: Equipment Discussions
Topic: Defective flash?
Replies: 11
Views: 1973

Here's the "issue fixed" picture (1/128 power):

Image
by santiago
Sat Dec 01, 2018 1:21 pm
Forum: Equipment Discussions
Topic: Defective flash?
Replies: 11
Views: 1973

OK, I'm confused. If the 580EX II is set in manual mode, it should not be preflashing to do any sort of exposure metering. I'm wondering if what's being talked about is attempted communication between flash units, with this one in Master mode. What "switch on the base of the unit" turned off the pr...
by santiago
Sat Dec 01, 2018 10:00 am
Forum: Equipment Discussions
Topic: Defective flash?
Replies: 11
Views: 1973

Lou Jost wrote:Good, I am glad you figured out how to turn the pre-flash off!
Figuring that out took 1 minute of googling, I just didn't know that a thing such as "pre-flash" existed! :D

Thanks again for the quick reply :)
by santiago
Sat Dec 01, 2018 9:42 am
Forum: Equipment Discussions
Topic: Defective flash?
Replies: 11
Views: 1973

Many flashes have settings that include a pre-flash to measure reflectance of the subject, so the flash can adjust its output appropriately. So it turns out that even in M mode there is some preflashing happening! Fortunately if you set the switch on the base of the unit to "OFF" the preflash gets ...
by santiago
Sat Dec 01, 2018 9:22 am
Forum: Equipment Discussions
Topic: Defective flash?
Replies: 11
Views: 1973

Many flashes have settings that include a pre-flash to measure reflectance of the subject, so the flash can adjust its output appropriately. Thanks for the reply. I just read that the preflash does not work on manual mode, but maybe it does? I never use this flash, only the Kuangren, I'll have to r...
by santiago
Sat Dec 01, 2018 9:16 am
Forum: Photography Through the Microscope
Topic: Radiolarians
Replies: 1
Views: 1043

Nice images
by santiago
Sat Dec 01, 2018 9:10 am
Forum: Equipment Discussions
Topic: Defective flash?
Replies: 11
Views: 1973

Defective flash?

After reading this excellent post , I made a "flash vs shutter speed" motion blur test by taking pictures of a spinning disc. To my surprise, I saw a strange "ghosting" effect on the images taken using the Canon Speedlite 580EX flash: http://www.photomacrography.net/forum/userpix/6993_ghosting_100_c...
by santiago
Thu Nov 29, 2018 11:56 am
Forum: Photography Through the Microscope
Topic: Auliscus sp
Replies: 36
Views: 12953

Santiago, if you choose the Main Page and use as keyword Mikrokosmos you will find near all Mikrokosmos Papers over years. All very intersting and still very actual. Enough for month to read. BG Anne That is brilliant, thank you! Really fantastic material with lots of information and beautiful pict...
by santiago
Thu Nov 29, 2018 10:27 am
Forum: Photography Through the Microscope
Topic: Auliscus sp
Replies: 36
Views: 12953

anne wrote:He published the formulation in 1985 in the german Mikrokosmos, available here on page 55:
http://www.zobodat.at/pdf/Mikrokosmos_74_0001.pdf
Amazing pdf!!! Thank you :)
by santiago
Thu Nov 29, 2018 5:09 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Dark mosaic
Replies: 8
Views: 3472

beautiful image!
by santiago
Wed Nov 28, 2018 6:39 am
Forum: Photography Through the Microscope
Topic: Auliscus sp
Replies: 36
Views: 12953

great stereo, love the choice of depth, those 4 "mountains" are very high! :)
by santiago
Wed Nov 28, 2018 5:10 am
Forum: Photography Through the Microscope
Topic: Auliscus sp
Replies: 36
Views: 12953

it reminds of Ernst Haeckel illustrations
by santiago
Wed Nov 28, 2018 2:09 am
Forum: Equipment Discussions
Topic: Tube lens tests for MFT and FF
Replies: 31
Views: 13167

This is the good zoom. I got mine cheap because the autofocus was broke. This had no effect on manual focus. For MFT it is a truly great tube lens. It beats most others at their fixed focal lengths, and on a 10x Mitu it lets me vary the magnification from 100% of nominal m down to 50-60% of nominal...
by santiago
Wed Nov 28, 2018 12:00 am
Forum: Photography Through the Microscope
Topic: Auliscus sp
Replies: 36
Views: 12953

great work and fascinating diatom
by santiago
Tue Nov 27, 2018 6:39 am
Forum: Equipment Discussions
Topic: Tube lens tests for MFT and FF
Replies: 31
Views: 13167

I used the distances provided in Robert's tests for 200mm tube lenses: The tube lens, facing forward, is focused at infinity, and there is 50mm between tube lens and objective. These were the results of his experiments with many different distances and arrangements, for APS format. I noted, however...