Search found 297 matches

by JW
Mon Jan 13, 2025 8:49 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Oxidized 1 euro cent
Replies: 5
Views: 1072

Re: Oxidized 1 euro cent

Darionett - you may want to find the following - disclosure - I have not, however, Pavel Kartashov is well known in both the mineral and corroded coin communities. MINERALIZATION CRUSTS AND OTHER NEOGENIC FORMATIONS AT CAST COINS OF CHINESE TYPE, Part1 P.M.Kartashov, Belov'sLaboratory of Minerals Cr...
by JW
Fri Jan 10, 2025 8:19 am
Forum: Equipment Discussions
Topic: Finding the subject - ideas needed
Replies: 26
Views: 2764

Re: Finding the subject - ideas needed

I find that strategically placing arrows often helps to point the way to the subject.
xpic.jpg
by JW
Thu Jan 09, 2025 1:08 pm
Forum: Equipment Discussions
Topic: UV(-A) light source
Replies: 17
Views: 2292

Re: UV(-A) light source

Rik - UV-A wavelengths are well known to activate catalysts for oxidation - converting pollutants such as nitrous oxide, ammonia, carbon monoxide, in the presence of air, into harmless nitrogen, water and carbon dioxide. High intensity is needed to meet the air flow and throughput requirements for i...
by JW
Thu Jan 09, 2025 11:43 am
Forum: Equipment Discussions
Topic: UV(-A) light source
Replies: 17
Views: 2292

Re: UV(-A) light source

Cooling becomes important when you cram 1-2 kW of LED UV-A emissivity power into a small space, like we were foolish enough to try. Hint: larger power supplies and appropriate gauge wiring are your friends here.
by JW
Thu Jan 09, 2025 10:44 am
Forum: Equipment Discussions
Topic: Black tape
Replies: 0
Views: 839

Black tape

I bought this inexpensive self-adhesive tape for framing my 140" diagonal projection wall/screen. I was surprised about how black and non-reflective it is, even when illuminated by a bright home-theater projector, and so its probably suitable for many flocking and similar uses. As usual, there are a...
by JW
Thu Jan 09, 2025 9:14 am
Forum: Equipment Discussions
Topic: UV(-A) light source
Replies: 17
Views: 2292

Re: UV(-A) light source

Not sure if this helps, Way-to-cool offers a wide range of UV light sources, plus they will custom build as needed : https://www.fluorescents.com/ I should also add the we (at work) have built our own UV-A lamps out of commercially available LEDs supplied by Luminus Devices, which can be obtained fr...
by JW
Mon Jan 06, 2025 8:16 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Wulfenite
Replies: 1
Views: 939

Re: Wulfenite

Strictly speaking, no longer wulfenite, but a pseudomorph - most likely smithsonite replacing wulfenite crystals. The darker green to the right is botryoidal pyromorphite.

2025-12-31-10.29.12 ZS PMax-small.jpg
by JW
Mon Jan 06, 2025 7:19 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Wulfenite
Replies: 1
Views: 939

Wulfenite

Wulfenite on pyromorphite from the old Whim Shaft dumps of the Perkiomen Mine, near Audubon, Montgomery County, Pennsylvania. Canon R7, Canon 20mm bellows lens, about 165mm extension, three Godox flashes
420-957s.jpg
by JW
Mon Jan 06, 2025 7:16 pm
Forum: Photography Through the Microscope
Topic: Big diatom, tiny features.
Replies: 3
Views: 897

Re: Big diatom, tiny features.

I literally gasped with the second image - just amazing!
by JW
Fri Jan 03, 2025 10:50 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Latest Vinyl LP record groove images
Replies: 6
Views: 1459

Re: Latest Vinyl LP record groove images

Ray - very nice. One question - what is your cutting? board sitting on - looks like carpeting - is this the floor or on a table?
by JW
Thu Jan 02, 2025 2:51 pm
Forum: Equipment Discussions
Topic: Want to buy a macro flash
Replies: 15
Views: 1769

Re: Want to buy a macro flash

Yup, its a jungle - all depends on your needs. I used to use the Canon macro dual head flash, which was two flash heads and the camera-hot shoe mounted controller, flash heads connected by cables. Since the cables are very short, the arrangement was extremely inconvenient and annoying to no end, hen...
by JW
Thu Jan 02, 2025 10:27 am
Forum: Equipment Discussions
Topic: Want to buy a macro flash
Replies: 15
Views: 1769

Re: Want to buy a macro flash

Cyclops - that's the kit, the two heads are wireless, can be controlled individually so each different intensity, and can be used on or off of the ring mount. I use three flash heads on mini-tripods for my studio macro work, no ring mount required. I suppose the ring mount may be handy for some, I d...
by JW
Tue Dec 31, 2024 7:27 pm
Forum: Equipment Discussions
Topic: Want to buy a macro flash
Replies: 15
Views: 1769

Re: Want to buy a macro flash

Cyclops - I am very happy with the Godox M12 USB rechargeable flash heads - you can place from 1 to 6 units on a ring around the lens, or place them off-lens or off-camera, or even hand held, and the system is wireless. You'll need the Godox wireless controller. Its plenty bright for macro use.
by JW
Tue Dec 31, 2024 7:13 pm
Forum: Equipment Discussions
Topic: WeMacro for Android issues
Replies: 2
Views: 812

Re: WeMacro for Android issues

Thanks Pau. I found the problem - probably only specific to those of us with older phones. The latest version of WeMacro Android app is for Android version 13. My phone is updated only to version 11, no more updates possible. I then downloaded the old WeMacro for Android v10 from the WeMacro site, a...
by JW
Sun Dec 29, 2024 1:16 pm
Forum: Equipment Discussions
Topic: WeMacro for Android issues
Replies: 2
Views: 812

WeMacro for Android issues

Yesterday, after not using the WeMacro rail for a while, I found the Android software crashing everytime I try to enter a value on screen 1 in any of the entry boxes - the fast/slow selection works however. All of the options and selections on screen 2 are working fine, except for 'run' obviously, a...