Search found 435 matches
- Mon May 20, 2024 6:32 pm
- Forum: Camera systems and imaging
- Topic: Remote shutter issue in Canon LIve View
- Replies: 4
- Views: 125
Re: Remote shutter issue in Canon LIve View
It's not your foot operated shutter release! .. Even the main shutter release button doesnt work with my 600D (and neither does my cable release) when tethered to eos utilities liveview shooting. BUT....... If I connect the camera to the computer and let eos utility open (without opening Utility's l...
- Sun May 19, 2024 9:08 pm
- Forum: Camera systems and imaging
- Topic: Remote shutter issue in Canon LIve View
- Replies: 4
- Views: 125
Re: Remote shutter issue in Canon LIve View
Are you using the pop up flash to trigger a second flash? It's a while since I used the flash on the 600d but I seem to remember that 'something needed to recharge' before I could take the next shot .. using a flash cable to connect & trigger the external flash was more satisfactory (But I was using...
- Tue Apr 30, 2024 7:55 pm
- Forum: Camera systems and imaging
- Topic: Is this genius or madness ?
- Replies: 25
- Views: 4582
Re: Is this genius or madness ?
I am curious to know how one could use a large 'bare' sensor like this ... or where a bare sensor should be put, or even if one should use a bare sensor at all ? I feel that when I direct project into an APSC dslr I am missing the corrections from the eyepiece. I keep hankering after a mirrorless fo...
- Mon Apr 22, 2024 6:58 pm
- Forum: Illumination Techniques
- Topic: Darkfield Illumination
- Replies: 17
- Views: 1219
Re: Darkfield Illumination
Javier, those are very nice darkfield photos, btw :-) As a side note; I found Traviss's instructions for making his adjustable expanding darkfield stop : https://archive.org/details/journalofquekett0210quek/page/76/mode/2up I cant quite follow them but maybe one needs to make a large one out of pape...
- Sun Apr 21, 2024 1:13 pm
- Forum: Illumination Techniques
- Topic: Darkfield Illumination
- Replies: 17
- Views: 1219
Re: Darkfield Illumination
The fact that in the object luminence refraction plays a significant role and I would also add reflection, is dabbled with in the discussions and by inference escapes to a large degree a resolution discussion based on diffraction theory alone. Yes, I think that you are right. Also most structures w...
- Sun Apr 21, 2024 7:52 am
- Forum: Illumination Techniques
- Topic: Darkfield Illumination
- Replies: 17
- Views: 1219
Re: Darkfield Illumination
It was my understanding the BF achieved the highest resolution possible, while others illumination techniques helped to gain contrast at the expense of a lower resolution. But of course, I might be wrong. Just talking about my personal experience This seems to have been the understanding and experi...
- Tue Apr 16, 2024 7:53 pm
- Forum: Home-made microscope adaptations
- Topic: Searching Cree LED for tiny dimmers
- Replies: 23
- Views: 20939
Re: Searching Cree LED for tiny dimmers
If part of the LED produces more blue, it can be filtered before entering the abbe? Yes possibly, eg if the projected image is larger than the bottom lens of the condenser the outer part could be 'dumped' .. I noticed the effect when projecting the image of the LED in a Jansjo desk light (so probab...
- Sun Apr 14, 2024 4:02 pm
- Forum: Home-made microscope adaptations
- Topic: Searching Cree LED for tiny dimmers
- Replies: 23
- Views: 20939
Re: Searching Cree LED for tiny dimmers
Looks like they found a ref which already has an adapted beam angle... So far, I didn't find a ref of such a LED. LED's are quite complex / can of worms This page and the next one on has some info: https://luminusdevices.zendesk.com/hc/en-us/articles/15571205799181-What-LED-Optical-Characteristics-...
- Sun Apr 14, 2024 10:36 am
- Forum: Microscopes and optics
- Topic: Averaging condenser and objective numerical aperture when predicting resolution
- Replies: 49
- Views: 5483
Re: Averaging condenser and objective numerical aperture when predicting resolution
I looked at the pinholes in a rather decayed sheet of generic mylar mirror-film, with a metallic objective last night and the sharpest/finest images came from using the (achro) condenser iris shut right down... I thought this was down to a 'run of the mill' 40x 0.65 Vickers objective. But this morni...
- Tue Apr 02, 2024 7:43 pm
- Forum: Microscopes and optics
- Topic: Averaging condenser and objective numerical aperture when predicting resolution
- Replies: 49
- Views: 5483
Re: Averaging condenser and objective numerical aperture when predicting resolution
(As Hans' two photographs show) as Conrad Beck says: ..a small almost transparent body may be rendered invisible by illuminating it with a full solid cone of light from the condenser, and it may be necessary to use a small angle of light to render it visible, an imperfect image being better than non...
- Mon Apr 01, 2024 6:55 pm
- Forum: Microscopes and optics
- Topic: Averaging condenser and objective numerical aperture when predicting resolution
- Replies: 49
- Views: 5483
Re: Averaging condenser and objective numerical aperture when predicting resolution
Is the table in here of any help? : https://archive.org/details/microscope02beckuoft/page/68/mode/2up The long and short of it seems to be that for every 0.1 of NA you resolve ~10,000 lines per inch using 'white light' (Fraunhofer Line E is actualy green) It would be nice to know how the illuminated...
- Sat Mar 30, 2024 4:30 pm
- Forum: Digital processing
- Topic: Chromatic aberrations filtering
- Replies: 52
- Views: 5329
Re: Chromatic aberrations filtering
I tested also different methods to filter or attenuate colors, with yellow and amber filters, wasn't satisfying or magic either. Try a "Kodak F1 Pale yellow" filter; it seems to chop off the 'stand alone' blue band pretty cleanly. I cant find a crossover (the Lee pale-yellow gelatine is not the sam...
- Sat Mar 30, 2024 10:42 am
- Forum: Pictures and Videos
- Topic: Everything looks better in slow motion
- Replies: 12
- Views: 1832
Re: Everything looks better in slow motion
That is very nice slow motion:-)
I would like to be able to do the same sort of thing.
Does the camera's letterbox view get taller when the frame rate is dropped ?
I would like to be able to do the same sort of thing.
Does the camera's letterbox view get taller when the frame rate is dropped ?
- Tue Mar 26, 2024 8:37 pm
- Forum: Microscopes and optics
- Topic: Substituting LED bulb for incandescent bulb
- Replies: 7
- Views: 2501
Re: Substituting LED bulb for incandescent bulb
If you havent got any way of regulating the light (beyond an iris ) then it is quite easy to have too much light for your eye. I think that there is quite a mismatch between what is comfortable to look at with your eye and the sort of of light output you might want to take a video. It is evening whe...
- Mon Mar 18, 2024 9:41 pm
- Forum: Microscopy accessories
- Topic: Anti-Static for lenses.
- Replies: 26
- Views: 3355
Re: Anti-Static for lenses.
There are cheap (think school demo) electrostatic charge indicators, I dug one out and the charge on a record is very definitely negative, I tried it on some glass (eyepieces and a petri dish lid) I couldnt pick up anything. It might be the damp english climate and the adjacent metal parts thats cau...
- Mon Mar 18, 2024 8:50 pm
- Forum: Microscopy accessories
- Topic: Anti-Static for lenses.
- Replies: 26
- Views: 3355
Re: Anti-Static for lenses.
Maybe this is wrong; but I think that the antistatic guns for records try to neutralise the charge on the vinyl.
The charge on glass seems to be of the opposite polarity to PVC; So it might have exactly the wrong effect.
The charge on glass seems to be of the opposite polarity to PVC; So it might have exactly the wrong effect.
- Sun Mar 10, 2024 7:58 pm
- Forum: Identification help
- Topic: Hmmm...what can this be?
- Replies: 7
- Views: 1594
Re: Hmmm...what can this be?
jackieone, you might enjoy this book:
https://archive.org/details/micrographi ... 5/mode/2up
Of course you might not
https://archive.org/details/micrographi ... 5/mode/2up
Of course you might not
- Wed Mar 06, 2024 8:36 pm
- Forum: Digital processing
- Topic: Chromatic aberrations filtering
- Replies: 52
- Views: 5329
Re: Chromatic aberrations filtering
bkt, out of curiosity is your microscope halogen or LED?
I noticed that in the (old?) specifications I came across it said it was a halogen system but it could take LED 'bulbs' too, if required.
I noticed that in the (old?) specifications I came across it said it was a halogen system but it could take LED 'bulbs' too, if required.
- Mon Mar 04, 2024 12:03 pm
- Forum: Pictures and Videos
- Topic: Lurking in your waste water drain
- Replies: 1
- Views: 235
Re: Lurking in your waste water drain
Wow ! .. A new source for stuff.
(and maybe longer lasting than cheek cells too) .
(and maybe longer lasting than cheek cells too) .
- Sun Mar 03, 2024 5:22 pm
- Forum: Camera systems and imaging
- Topic: OM1 Objective adapter
- Replies: 21
- Views: 7918
Re: OM1 Objective adapter
I have one of these already. I use it in the field with my Macro lens! You probably ought to have two, when you get going. As far as other kinds of lights go; if they are bright sources they might need another item to diffuse the light around the subject (much like flashguns do with macro) somethin...
- Sun Mar 03, 2024 4:55 pm
- Forum: Pictures and Videos
- Topic: High frame rate with a mobile phone : a Vorticella
- Replies: 1
- Views: 253
High frame rate with a mobile phone : a Vorticella
Prompted by topcode's ToupeTek high speed video footage. Here is a rough idea of what the 'slow motion' option of a mobile-phone camera over the eyepiece looks like (not as fast as the topecode's camera) Unfortunately this 3 year old phone has a scratched camera glass which is why there is flaring a...
- Sun Mar 03, 2024 9:44 am
- Forum: Pictures and Videos
- Topic: Various Spiral bacteria at high framerates(1400+)
- Replies: 18
- Views: 1253
Re: Various Spiral bacteria at high framerates(1400+)
I did do rotifers a while back.
After you posted that, I had a quick go with a mobile phone (480 fps) hand held over the eyepiece and it slowed the wave down nicely.
I was using much less than 3W of light at the time and yet it still, sort of, worked
So; thanks!
- Thu Feb 29, 2024 10:30 am
- Forum: Camera systems and imaging
- Topic: OM1 Objective adapter
- Replies: 21
- Views: 7918
Re: OM1 Objective adapter
A simple light that is good for the job:
Just plonk it on table close to the subject, it lasts a good few evenings on a charge.
(It has a diffusing front surface)
Dont get the the VL49 version that has the letters 'RGB' in its name.Just plonk it on table close to the subject, it lasts a good few evenings on a charge.
(It has a diffusing front surface)
- Wed Feb 28, 2024 8:40 pm
- Forum: Camera systems and imaging
- Topic: OM1 Objective adapter
- Replies: 21
- Views: 7918
Re: OM1 Objective adapter
In human terms the focus distance from the end of the objective will not be so different to the focus distance when is mounted onto your microscope. (~ 2 cm with a 4x and ~5mm with a 10x) I am not sure that the lens maths will help you to easily derive the distance difference but there are a nice se...
- Wed Feb 28, 2024 9:41 am
- Forum: Camera systems and imaging
- Topic: OM1 Objective adapter
- Replies: 21
- Views: 7918
Re: OM1 Objective adapter
Am I going to be in need of spacers to get the 10x objective to the correct distance to be in focus? Are you having trouble with the 10x objective, in particular ? i.e. Is the 4x objective working OK on the cone ? Using a microscope objective on a camera is a pretty 'freestyle' thing ...all sorts o...
- Sun Jan 21, 2024 8:41 pm
- Forum: Microscopes and optics
- Topic: NIKON PlanApo 100X/140 oil that is a PlanApo 60X/140 oil
- Replies: 121
- Views: 10776
Re: NIKON PlanApo 100X/140 oil that is a PlanApo 60X/140 oil
There are quite a few objectives taken apart on this site:
https://www.funsci.it/schede-tecniche.html
(It doesn't have your objective, but it might give some general idea about how it might be put together)
https://www.funsci.it/schede-tecniche.html
(It doesn't have your objective, but it might give some general idea about how it might be put together)
- Sun Jan 21, 2024 2:39 pm
- Forum: Microscopes and optics
- Topic: NIKON PlanApo 100X/140 oil that is a PlanApo 60X/140 oil
- Replies: 121
- Views: 10776
Re: NIKON PlanApo 100X/140 oil that is a PlanApo 60X/140 oil
Do just check (with a stereo or magnifier) that above or below the knurled ring there isn't another thread that splits the barrel. It is sometimes a bit of a guess whether an edge is just a machined ledge or the edge of a thread .. scraping into the edge with a needle can sometimes help to see what ...
- Tue Jan 16, 2024 10:17 am
- Forum: Camera systems and imaging
- Topic: How can i fix the checker pattern created from 3x binning?
- Replies: 2
- Views: 2031
Re: How can i fix the checker pattern created from 3x binning?
I can hardly see any checker pattern, just a bit of roughness to the background.
It is great to see the flagella in slow motion!!
....Hypnotic.
I guess doing this requires quite a powerful illumination?
It is great to see the flagella in slow motion!!
....Hypnotic.
I guess doing this requires quite a powerful illumination?
- Thu Jan 11, 2024 2:41 pm
- Forum: Beginner's corner
- Topic: Looking for camera for Swift SW380B
- Replies: 28
- Views: 9818
Re: Looking for camera for Swift SW380B
If you would like to explore using your mobile phone a bit further there are a couple of things to be aware of: A] Over time the eyepoint of eyepieces has got higher which can mean that the basic camera phone clamps can sit in the wrong place. B] Some mobile phones dont let the user manually set the...
- Sat Jan 06, 2024 9:34 pm
- Forum: Pictures and Videos
- Topic: Advices to improve my pictures
- Replies: 11
- Views: 8101
Re: Advices to improve my pictures
As for cleaning the lens you need a good amount of dirt to really notice the difference in contrast It might be the English weather or perhaps the English glass but just about every single eyepiece from the black era microscopes I have has needed a good clean. For some reason the few eyepieces that...