Search found 37 matches

by georgetmacro
Wed May 29, 2019 10:11 am
Forum: Illumination Techniques
Topic: EPI unintentional
Replies: 0
Views: 4572

EPI unintentional

While experimenting with my ongoing EPI journey I inadvertently took this image. I will not disclose what it is of, but maybe others have seen similar before. It was not taken with an EPI objective, just a standard APO one (10x) using vertical illumination. Photographed with a Nikon D300s fitted to ...
by georgetmacro
Tue Apr 23, 2019 5:44 am
Forum: Illumination Techniques
Topic: EPI dedicated hybrid
Replies: 9
Views: 4736

Re: EPI dedicated hybrid

Hi again guys. I am looking at modifying my epi arrangement based on this discussion. What I have come up with so far is to place the illuminator directly on top of a Nikon 'S' series polarizer (see image) that is sitting directly above the nosepiece. This will reduce the tube length to ~188 mm. The...
by georgetmacro
Mon Apr 22, 2019 1:20 pm
Forum: Illumination Techniques
Topic: EPI dedicated hybrid
Replies: 9
Views: 4736

Re: EPI dedicated hybrid

Thanks, everybody for the advice/suggestions. I think, Bob, your suggestion of sourcing an epi microscope is probably the way to go. I have asked one of the Russian eBay suppliers to put something together for me to think about. He is suggesting an epi M27 microscope (MMU-1 or MMU-3), Lomo I guess, ...
by georgetmacro
Sun Apr 21, 2019 5:54 am
Forum: Illumination Techniques
Topic: EPI dedicated hybrid
Replies: 9
Views: 4736

EPI dedicated hybrid

Hi. I am in the process of setting up one of my microscopes as a dedicated EPI unit. I have got it to the point that I know it works but I have no RMS EPI objectives. Does anybody either have any they can sell to me or let me know where I can get them without breaking the bank. There are plenty on e...
by georgetmacro
Tue Apr 09, 2019 4:44 am
Forum: Camera systems and imaging
Topic: How to attach camera to Olympus BH2?
Replies: 23
Views: 8421

Re: How to attach camera to Olympus BH2?

I have an Olympus CH with a BH-2 trinocular head. I have made a mount for Nikon F ( I use microscopy dedicated Nikon D200) but was not satisfied with it so have ordered one from an Ebay supplier in America, (newhopper (4872)). His price was US$59 with a 'make an offer' option. I got mine ordered for...
by georgetmacro
Tue Apr 09, 2019 4:30 am
Forum: Illumination Techniques
Topic: Dark field tin crystal
Replies: 6
Views: 3667

Re: Dark field tin crystal

I have spoken to the person that gave me the samples. I have also shown/given him a full-gloss image for his gem & rock shop. He has assured me that the image is of cassiterite as Scarodactyl suggested. Apparently, cassiterite is the main ore associated with tin crystal form.
by georgetmacro
Mon Apr 08, 2019 6:04 pm
Forum: Illumination Techniques
Topic: Dark field tin crystal
Replies: 6
Views: 3667

Re: Dark field tin crystal

Apochronaut. Given that way back in 1982 thereabouts I only just scraped through geology 101 within my first (BSc) degree know pretty well zilch about the subject. I have however read that tin, tungsten and gold often occur together. Could this be a chance occurrence of gold amongst the tin I wonder...
by georgetmacro
Mon Apr 08, 2019 9:26 am
Forum: Illumination Techniques
Topic: Dark field tin crystal
Replies: 6
Views: 3667

Dark field tin crystal

While carrying out more dark-field experimentation, the attached image of tin crystal structure surface at 200X magnification has me somewhat bewildered. My setup was simply under lighting on my Olympus CH with an 80A photographic (blue) filter over the light source, also a make-shift dark-field arr...
by georgetmacro
Thu Apr 04, 2019 4:17 pm
Forum: Illumination Techniques
Topic: Dark-field white sugar
Replies: 14
Views: 6865

Re: Dark-field white sugar

billbillt. If you are interested in the direction archaeology is taking us regarding a better understanding of Hominin cognition and my thoughts on the subject have a look at my ongoing website
https://www.archaeology.vip
by georgetmacro
Wed Apr 03, 2019 6:55 am
Forum: Illumination Techniques
Topic: Phase contrast microscopy
Replies: 3
Views: 2843

Re: Phase contrast microscopy

PeteM. The phase contrast instrument is, as far as I know, a standard under-stage one to suit Lomo Biolam microscopes. The mounting diameter is ~37 mm. I say approximately because the one I have on my modified Biolam is around 36.83 mm. The NA = 0.8 is the figure the supplier told me for the condens...
by georgetmacro
Wed Apr 03, 2019 2:56 am
Forum: Illumination Techniques
Topic: Phase contrast microscopy
Replies: 3
Views: 2843

Phase contrast microscopy

Hi. I have just purchased an inexpensive Lomo 'negative phase contrast' condenser to experiment with. The NA is 0.8 according to the supplier. The unit comes with two objectives that are supposedly specific to this type of microscopy. The item has not arrived yet so I would like to learn something a...
by georgetmacro
Tue Apr 02, 2019 5:22 am
Forum: Illumination Techniques
Topic: Dark-field white sugar
Replies: 14
Views: 6865

Re: Dark-field white sugar

Scarodactyl. What you say is absolutely correct. If the quartz sand from the area is established to correlate proportionately with the clay used at the time than one could assume that the quartz was not added intentionally, however, we know for a fact that in contemporary clay, the quartz is added f...
by georgetmacro
Mon Apr 01, 2019 9:10 pm
Forum: Illumination Techniques
Topic: Dark-field white sugar
Replies: 14
Views: 6865

Re: Dark-field white sugar

I am studying at the master's level archaeology where my interest is attaching a cultural ideology to archaeological assemblages. My interest includes experimental archaeology whereby contemporary analogous experiments can offer a means to empirically validate hypotheses. Or at least, until further ...
by georgetmacro
Sun Mar 31, 2019 11:38 pm
Forum: Illumination Techniques
Topic: Dark-field white sugar
Replies: 14
Views: 6865

Re: Dark-field white sugar

Hi again. Because I am studying how to identify various artefacts found in archaeological assemblages I thought to experiment with the crystal structure of sugar was a good and accessible place to start. I have added another image using a slightly different technique (still kind-of dark field) with ...
by georgetmacro
Sun Mar 31, 2019 7:28 am
Forum: Illumination Techniques
Topic: Dark-field white sugar
Replies: 14
Views: 6865

Dark-field white sugar

Hi. I haven't been here for a while. I have been very busy with other academic related issues. I have been putting together some equipment for dark-field stuff. This is my first attempt. Sugar using an older Nikon microscope c1960s I think. I simply used a standard Olympus 4X objective with ~150mm e...
by georgetmacro
Fri Nov 17, 2017 11:32 pm
Forum: Pictures and Videos
Topic: Black ant from LOMO 10X APO
Replies: 5
Views: 1317

Re: Black ant from LOMO 10X APO

MichaelG ... yes, the LOMO APO seems quite good. There is absolutely no modification to this image notwithstanding a couple of spots that appeared on the background due to exaggerated specs of dust on the ccd that I fixed with the rubber stamp in a generic image (PhotoFilter) program.
by georgetmacro
Fri Nov 17, 2017 11:39 am
Forum: Pictures and Videos
Topic: Black ant from LOMO 10X APO
Replies: 5
Views: 1317

Re: Black ant from LOMO 10X APO

MichaelG ... The so-called technical details are quite basic actually. I just used the LOMO 10X lens on my Olympus CH microscope ... I had to use a 7mm mounting spacer so as to get the objective to focus because the operating distance is different to that of the standard Olympus objectives so the ma...
by georgetmacro
Fri Nov 17, 2017 8:56 am
Forum: Pictures and Videos
Topic: Black ant from LOMO 10X APO
Replies: 5
Views: 1317

Black ant from LOMO 10X APO

Black ant ... still testing the LOMO 10X APO
by georgetmacro
Wed Nov 15, 2017 9:56 pm
Forum: Pictures and Videos
Topic: Casuarina stem growing tip
Replies: 3
Views: 845

Casuarina stem growing tip

Hi. Just testing a newly acquired Lomo 10X APO lens on a Olympus CH 160mm tube length microscope. Lighting is direct circular LED. Camera is Nikon D200, 40 exposures 1/5 sec 10um shifts, DMax. The subject is the growing tip of a Casuarina cunninghamia (Australian native plant commonly called a She-o...
by georgetmacro
Sat Oct 14, 2017 9:34 pm
Forum: Pictures and Videos
Topic: Blak ant, Olympus CH
Replies: 2
Views: 829

Blak ant, Olympus CH

Black ant ... X4 standard Olympus CH objective ... photographed with no eyepiece in the tube. Camera is a Nikon D200 with a home-made microscope attachment. Lighting is not the best but all I have at the moment ... incident with the microscope underlight on and the condenser in lowest position. I ha...
by georgetmacro
Mon Oct 02, 2017 10:21 pm
Forum: Illumination Techniques
Topic: DIN vs RMS & verticle illumination
Replies: 3
Views: 1972

DIN vs RMS & verticle illumination

This is probably a silly question but just thought I would ask anyway ... Is it possible to change the nose-piece to a DIN then use an adapter with a light path around it so as to use RMS objective for vertical illumination? If this was possible it would save the huge extra cost of EPI/APO infinity ...
by georgetmacro
Sun Oct 01, 2017 8:16 am
Forum: Pictures and Videos
Topic: Caddis Fly ... not micro but macro
Replies: 1
Views: 705

Caddis Fly ... not micro but macro

Hi. This is not a microscope image obviously but one I took today with Nikon D300S and Tamron macro lens with extension ...used a small top mounted flash unit F22 at max synchro of 1/250. I just thought it might interest others who may also take part in macr0 photography. Of special interest to me i...
by georgetmacro
Fri Sep 29, 2017 8:28 am
Forum: Important announcements
Topic: New microscope stepper unit
Replies: 2
Views: 6751

Re: New microscope stepper unit

Has anybody actually used this equipment ... I notice it states each step represents 1 micron. I thought that the depth of field for, say a X 100 objective is around 0.5 micron?
by georgetmacro
Thu Sep 28, 2017 7:01 am
Forum: Introduce yourself
Topic: New new super new
Replies: 3
Views: 2154

My first microscope

Welcome aboard ... I too only joined very recently. I have attached a picture of my first microscope ... also at about 8 or 9. It is one of my most treasured possessions as it was a present from my father who always seemed to instinctively know where my interests were. I am now 69 years of age. I sh...
by georgetmacro
Thu Sep 28, 2017 6:48 am
Forum: Microscopes and optics
Topic: Lomo work in progress
Replies: 5
Views: 1585

Lomo work in progress

See attached image of the so-far Lomo Biolam modification so as to pair it up with Carl Zeiss bits and pieces. mods are: 1) Base mounting under the stage has been stepped up to accommodate very small and close working distances of Carl Zeiss Jenna APO objectives. 2) Head attachment modified to accep...
by georgetmacro
Sun Sep 24, 2017 11:09 am
Forum: Pictures and Videos
Topic: Tiny unknown insect
Replies: 1
Views: 767

Tiny unknown insect

A very, very tiny unknown insect (2 mm long by O.45 mm across) ... not overly happy with it due to lack of contrast etc but getting more comfortable with my stacking technique just need to get some better objectives and better lighting technique. This little chap took 92 images stacked at 5 microns ...
by georgetmacro
Fri Sep 22, 2017 8:52 am
Forum: Pictures and Videos
Topic: Live-ant head using Carl Zeiss apo
Replies: 2
Views: 648

Re:Live-ant head using Carl Zeiss apo

Here is another one where I actually used a analog gauge so that each stacking image is precisely in increments of 0.01 mm travel of the stage. I tried this using both a Vickers objective then a Carl Zeiss Jenna APO ... This on is with the CZ objective around 50 images I think.
by georgetmacro
Fri Sep 22, 2017 1:01 am
Forum: Pictures and Videos
Topic: Live-ant head using Carl Zeiss apo
Replies: 2
Views: 648

Live-ant head using Carl Zeiss apo

In this image I have used a Carl Zeiss Jena 190 mm tube length objective (11X NA= 0.30) on a 160 mm tube length Nikon S series microscope. I feel that it has potential but having difficulty with the regularity of the stacking focus distances so am in the process of fitting a analog height gauge that...
by georgetmacro
Thu Sep 21, 2017 12:25 pm
Forum: Pictures and Videos
Topic: Golden gnat
Replies: 13
Views: 2282

Re: Golden gnat

As a beginner re photo-stacking I have adopted some of what you have used here to experiment with static images. The image I have posted is actually a whirl created from drilling through brass. I used a ping pong ball around the specimen that was on a slide with a partially translucent small piece o...
by georgetmacro
Thu Sep 21, 2017 11:02 am
Forum: Pictures and Videos
Topic: Tachyporus hypnorum
Replies: 7
Views: 1398

Re: Tachyporus hypnorum

billben74 ... Nice image ... Excuse my novice ignorance but what are DMAP artefacts exactly... are they images that reoccur in slightly different places because of the multiple imaging stacking process??