Search found 109 matches
- Fri Apr 19, 2024 11:08 pm
- Forum: Equipment Discussions
- Topic: Rear lens + Lomo 3.7
- Replies: 13
- Views: 305
Re: Rear lens + Lomo 3.7
Robert has used the Lomo 3.7 lens stacked with a Schneider Kreuznach 120mm f/5.6 Makro-Symmar Line Scan Lens set to f.5.6 and normally mounted focused at infinity to good effect. You could try the Componon-S, though I can't find anyone who has done this - hard to predict the results. See https://www...
- Thu Feb 01, 2024 10:49 pm
- Forum: Technical and Studio Photography -- Macro and Close-up
- Topic: Kinoite on Apophyllite from the Christmas Mine
- Replies: 5
- Views: 555
Kinoite on Apophyllite from the Christmas Mine
After a long absence (moved house, upgraded equipment, new automatic stacking rig) I have some new minerals to share! This is a micro mount specimen from the well-known Christmas Mine in Gila, Arizona of Kinoite (blue tabular crystals) on colorless Apophyllite. This is the type locality for Kinoite....
- Tue Nov 14, 2023 1:22 pm
- Forum: Equipment Discussions
- Topic: LED lamps from Ebay UK
- Replies: 6
- Views: 4290
Re: LED lamps from Ebay UK
Anyone see an offering with slightly less output but claimed >90 CRI?
I might buy and disassemble one of these and see if the LED module might be standard enough to be exchanged.
I might buy and disassemble one of these and see if the LED module might be standard enough to be exchanged.
- Tue Nov 14, 2023 1:17 pm
- Forum: Equipment Discussions
- Topic: Can You repurpose a 3D printer for focus stacking?
- Replies: 12
- Views: 6031
Re: Can You repurpose a 3D printer for focus stacking?
If anyone wants the combination Arduino and Raspberry Pi code I wrote to control that rail, including closed loop control with input from the high resolution quadrature linear encoder, I can give you access (honestly I should just clean it up and open source it). It does currently use a Polulu Tic s...
- Sat Jun 24, 2023 7:28 am
- Forum: Technical and Studio Photography -- Macro and Close-up
- Topic: how to retouch stereo images
- Replies: 32
- Views: 2151
Re: how to retouch stereo images
I have just now rewritten the Retouching section of https://zerenesystems.com/cms/stacker/docs/syntheticstereo to read as follows: Retouching In most cases you cannot retouch shifted outputs from un shifted inputs because image features will not line up correctly. So, the key trick for retouching s...
- Sat Jun 24, 2023 7:20 am
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: By request, my setup
- Replies: 4
- Views: 4656
Re: By request, my setup
Which make/model led lights do you use? The setup looks very detailed. From the first image, the square lights appear to be Godox LED64 units. Claimed 1000+ Lux at 0.5 meters is quite good for the size; the bicolor temp adjustment range is limited to the cooler side of the spectrum though (5500k - ...
- Fri Apr 28, 2023 8:22 am
- Forum: Equipment Discussions
- Topic: Nikon Small World eligible lenses
- Replies: 10
- Views: 2044
Re: Nikon Small World eligible lenses
I work a lot with my Minolta 5400 lens, but objectively I think that its use cannot be considered to participate in the Nikon Small World contest The rules say that the images must be taken by the participant using an optical microscope, therefore the mandatory use of a microscope lens, even if it ...
- Sun Apr 23, 2023 1:25 pm
- Forum: Technical and Studio Photography -- Macro and Close-up
- Topic: NMM-3529
- Replies: 2
- Views: 980
Re: NMM-3529
This is fascinating and I'd love to know more about how such tiny specimens would be found and identified, given their size. Melt ice and sort through the powder attracted by an electromagnet under a stereozoom? Sheer luck?
- Fri Dec 02, 2022 8:54 pm
- Forum: Equipment Discussions
- Topic: Manual stepper
- Replies: 6
- Views: 1177
Re: Manual stepper
from all I've read and from some basic test of myself, microsteps will only get you so far with accuracy. In what I've seen most setups will suffer from non-uniform step size once we go into higher micro stepping. I also doubt that the ebay linked rail will truly get 1um accuracy. The stage I linke...
- Fri Dec 02, 2022 10:48 am
- Forum: Equipment Discussions
- Topic: Manual stepper
- Replies: 6
- Views: 1177
Re: Manual stepper
Allan has done a lot of great work, but the project you're looking at is likely not fully generalizable to LEGO. K'NEX is probably not even worth considering. LEGO has incredible tolerances, claims vary but what I read is somewhere around 2 microns. The problem is that tolerances stack in a mechanic...
- Tue Sep 06, 2022 9:51 am
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: Shutter speed vs magnification
- Replies: 12
- Views: 1904
Re: Shutter speed vs magnification
If you're seeing blur at higher magnifications, it's more a commentary on your imaging system or environment than any real limitation inherent to shutter speed. A perfectly rigid system in a room without drafts and a stationary subject - or one with an electronic shutter - should have performance en...
- Tue May 31, 2022 1:29 pm
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: Questions about UV fluorescent photography
- Replies: 18
- Views: 2959
Re: Questions about UV fluorescent photography
No filtering was applied on the light source or camera side, and along the top/right you can see the natural deep green of this Rogerly fluorite. There is essentially no violet pollution; the brilliant blue is accurate for this particular specimen. What settings do you use for nominal white balance...
- Tue May 31, 2022 12:46 pm
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: Questions about UV fluorescent photography
- Replies: 18
- Views: 2959
Re: Questions about UV fluorescent photography
Rogerly_Fluorescent.jpg This is a macroscopic focus stack from a 14.8 cm wide specimen of fluorite from the Rogerly mine in England, lit from the left and slightly below with my Convoy with a Nichia U365 emitter, mixed with dim natural light from above. The Convoy was about 1.5 meters from the spec...
- Tue May 31, 2022 9:30 am
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: Questions about UV fluorescent photography
- Replies: 18
- Views: 2959
Re: Questions about UV fluorescent photography
Putting short pass filters at the UV flashlight will improve a lot your results. Best ones are expensive but if the size matches Chinese ZWB2 are very affordable and convenient. Emission long pass filters for the camera/eye side are also recommendable (for the eyes wear protective glasses, any eyeg...
- Thu May 26, 2022 8:33 am
- Forum: Equipment Discussions
- Topic: 3D Printing M25 Threads for Objective Cases
- Replies: 13
- Views: 1853
Re: 3D Printing M25 Threads for Objective Cases
If you want translucent, you want a bit of deliberate overextrusion and 100% infill (actually ideally 999 walls with 0% infill and gap fill enabled). Any gaps - infill or between layers - will be obvious and visible. However this has to be balanced with the need for the threads to work at the top of...