Search found 212 matches

by Zuul
Tue Aug 04, 2020 1:17 am
Forum: Illumination Techniques
Topic: Rheinberg illumination experiment
Replies: 7
Views: 1208

Re: Rheinberg illumination experiment

Microscopes are not like magnifying glasses. They work on the basis of interference patterns that break the white light into color bands. They fail to resolve images when the interference patterns are not present. I think the color consequences on microscopic images are unpredictable. There doesn't...
by Zuul
Tue Aug 04, 2020 1:09 am
Forum: Camera systems and imaging
Topic: Reichert 410 "Microstar IV" head -- corrective element present in binocular path but not trinocular camera port
Replies: 155
Views: 18345

Re: Reichert 410 "Microstar IV" head -- corrective element present in binocular path but not trinocular camera port

Zuul, thanks for posting, I was curious about this configuration and your results look promising. To make sure I understand the setup before commenting further: No optical components were in the light path other than the corrective optic. Does this mean telan --> corrector --> sensor? Were any of t...
by Zuul
Mon Aug 03, 2020 10:07 pm
Forum: Camera systems and imaging
Topic: Reichert 410 "Microstar IV" head -- corrective element present in binocular path but not trinocular camera port
Replies: 155
Views: 18345

Re: Reichert 410 "Microstar IV" head -- corrective element present in binocular path but not trinocular camera port

I was able to get the CA-correcting optic into the path between my trinocular port and the camera for some quick testing. This was done direct to a full frame sensor in order to capture the entire width of the projected image. No optical components were in the light path other than the corrective op...
by Zuul
Mon Aug 03, 2020 7:39 pm
Forum: Microscopes and optics
Topic: Reichert 181 eyepiece field curvature
Replies: 46
Views: 3187

Re: Reichert 181 eyepiece field curvature

Perhaps Hans could be encouraged to broaden his investigations The tin snips are oiled and ready if anyone wants to loan me one of these Nikon CWDs... but obviously, to avoid the expedient (to use MichaelG's word of the day) eyepiece modification, it would be better to do this by putting something ...
by Zuul
Mon Aug 03, 2020 3:51 pm
Forum: Camera systems and imaging
Topic: Reichert 410 "Microstar IV" head -- corrective element present in binocular path but not trinocular camera port
Replies: 155
Views: 18345

Re: Reichert 410 "Microstar IV" head -- corrective element present in binocular path but not trinocular camera port

The meathod of removal also greatly hindered the chance of determining whether that cylinder is/was actually a doublet.
by Zuul
Mon Aug 03, 2020 3:35 pm
Forum: Microscopes and optics
Topic: Reichert 181 eyepiece field curvature
Replies: 46
Views: 3187

Re: Reichert 181 eyepiece field curvature

For the sake of argument (not that anyone here enjoys debate...) let’s assume that the Nikon objectives do produce a perfectly corrected image. As soon as that image enters the tube/telan lens it develops aberrations. As it travels through the binocular beam splitter, it develops additional aberrati...
by Zuul
Mon Aug 03, 2020 12:13 am
Forum: Microscopes and optics
Topic: Reichert 181 eyepiece field curvature
Replies: 46
Views: 3187

Re: Reichert 181 eyepiece field curvature

I just rebuilt the 410’s focus mechanism so I’m behind on experimenting with the CA de-aberrator. It is a real shame that you can’t take that lens out non-destructively. I would prefer to incorporate it into my photo tube as-is, but that’s not a trivial endeavor. If I could eliminate the CA and get ...
by Zuul
Mon Aug 03, 2020 12:07 am
Forum: Microscopes and optics
Topic: Reichert 181 eyepiece field curvature
Replies: 46
Views: 3187

Re: Reichert 181 eyepiece field curvature

It looks like there may be a bit less, but also the image is cropped showing less of the field than the first? I guess it would not be surprising if that corrective plate had some effect on field curvature also. That shot was done direct projection. No eyepiece at all. I don’t have one with the 40x...
by Zuul
Sun Aug 02, 2020 11:07 pm
Forum: Microscopes and optics
Topic: Reichert 181 eyepiece field curvature
Replies: 46
Views: 3187

Re: Reichert 181 eyepiece field curvature

Is that the 40X plan achro? Mine has some residual pincushion like that also (less than the eyepiece alone, I think, but a more careful comparison would be a good idea) while the 4X and 10X come out much straighter. I have not spent nearly as much time looking through the 100X, just got some immers...
by Zuul
Sun Aug 02, 2020 7:19 pm
Forum: Microscopes and optics
Topic: Reichert 181 eyepiece field curvature
Replies: 46
Views: 3187

Re: Reichert 181 eyepiece field curvature

The following image was shot through the binocular eyepiece of my 410 using my iPhone. To my eye, it shows similar distortion to your eyepiece test despite having the benefit of the entire system of corrections. Is the curvature actually an interaction between the eyepiece and the phone? https://liv...
by Zuul
Thu Jul 30, 2020 3:46 pm
Forum: Pictures and Videos
Topic: Copepod
Replies: 5
Views: 357

Re: Copepod

Definitely order Cyclopoida. I don’t have a good reference for better ID, unfortunately.

You found one with beautiful egg pods.
by Zuul
Thu Jul 30, 2020 6:39 am
Forum: Camera systems and imaging
Topic: Reichert 410 "Microstar IV" head -- corrective element present in binocular path but not trinocular camera port
Replies: 155
Views: 18345

Re: Reichert 410 "Microstar IV" head -- corrective element present in binocular path but not trinocular camera port

Here is the direct projection to ceiling I mentioned earlier, using 181 eyepiece without corrector and Samsung LH351D series LED running at ~6 W if I remember correctly. Going to need a catchy phrase for this new camera coupling method... "diffuse afocal" maybe? The ceiling is slanted but the depth...
by Zuul
Thu Jul 30, 2020 2:28 am
Forum: Camera systems and imaging
Topic: Reichert 410 "Microstar IV" head -- corrective element present in binocular path but not trinocular camera port
Replies: 155
Views: 18345

Re: Reichert 410 "Microstar IV" head -- corrective element present in binocular path but not trinocular camera port

as is common with inexpensive lenses I think, doesn't have an accurate mechanical stop at infinity It’s common because many of the materials used to build modern lenses have disparate coefficients of thermal expansion. The “slop” is so the lens can still focus to infinity in extreme temperatures. I...
by Zuul
Thu Jul 30, 2020 2:20 am
Forum: Pictures and Videos
Topic: Copepod
Replies: 5
Views: 357

Re: Copepod

Tisbe? Very nice shot.
by Zuul
Thu Jul 30, 2020 2:16 am
Forum: Camera systems and imaging
Topic: Reichert 410 "Microstar IV" head -- corrective element present in binocular path but not trinocular camera port
Replies: 155
Views: 18345

Re: Reichert 410 "Microstar IV" head -- corrective element present in binocular path but not trinocular camera port

Is that practice commonly employed with telescopes or microscopes? I said commonly shared . It’s described on Charles Krebs‘ site and repeated frequently in other places. Like many things on the internet, in the absence of better information, you use what you can find. To be fair, he says this is a...
by Zuul
Thu Jul 30, 2020 12:18 am
Forum: Camera systems and imaging
Topic: Reichert 410 "Microstar IV" head -- corrective element present in binocular path but not trinocular camera port
Replies: 155
Views: 18345

Re: Reichert 410 "Microstar IV" head -- corrective element present in binocular path but not trinocular camera port

One thing I notice is that , a lot of people seem to think that the optical tube and projection distances should be quite tight. I don't know where this is coming from? The commonly shared technique for eyepiece projection: 1) Locate the distance where the eyepiece provides a sharp view to your eye...
by Zuul
Fri Jul 24, 2020 3:37 pm
Forum: Microscopes and optics
Topic: DSLR vs iPhone
Replies: 18
Views: 1444

Re: DSLR vs iPhone

Firstly, your trinocular tube image is not only mal-corrected it is mis-aligned. The axis is shifted towards 4 o'clock. This is definitely an optical mis-match. The photo tube should provide a nicely corrected image to your awaiting sensor. Case closed. You refer to a "dealer". They obviously made ...
by Zuul
Fri Jul 24, 2020 3:26 pm
Forum: Microscopes and optics
Topic: DSLR vs iPhone
Replies: 18
Views: 1444

Re: DSLR vs iPhone

Firstly, your trinocular tube image is not only mal-corrected it is mis-aligned. The axis is shifted towards 4 o'clock. This is definitely an optical mis-match. The photo tube should provide a nicely corrected image to your awaiting sensor. Case closed. You refer to a "dealer". They obviously made ...
by Zuul
Fri Jul 24, 2020 4:33 am
Forum: Pictures and Videos
Topic: Diatoms
Replies: 12
Views: 1398

Re: Diatoms

the images look way much better contrasted and with more details front the eyepieces. That comment is repeated on this forum and others all the time . Photomicroscopy is very unforgiving and requires certain techniques to be learned. (I’m no expert, but I am trying to learn, too!) The very detailed...
by Zuul
Thu Jul 23, 2020 11:53 pm
Forum: Pictures and Videos
Topic: Sea creature
Replies: 14
Views: 1091

Re: Sea creature

Looks like a Tardigrade (water bear) to me, which means it’s probably not! :lol:
by Zuul
Thu Jul 23, 2020 7:20 pm
Forum: Beginner's corner
Topic: floaters
Replies: 13
Views: 1875

Re: floaters

Would putting a few saline drops in your eyes before a viewing session help flush the floaters out? I know you can’t eliminate them. I just wonder if you minimize them. Maybe I’ll try this the next time they are very conspicuous.
by Zuul
Thu Jul 23, 2020 6:10 pm
Forum: Microscopes and optics
Topic: B+L StereoZoom models (?)
Replies: 1
Views: 462

B+L StereoZoom models (?)

When the topic of stereo scopes comes up, Bausch + Lomb often percolates to the top of the discussion. But with the exception of identifying various older models, it seems like the StereoZoom 7 is the only one that gets talked about. It is so far superior that the others aren't that interesting? Did...
by Zuul
Thu Jul 23, 2020 5:54 pm
Forum: Microscopes and optics
Topic: Bino issue with Olympus CH-2
Replies: 11
Views: 1274

Re: Bino issue with Olympus CH-2

The first step to getting the best possible advice is to post pictures of the damage. The more the better, and with as much detail as you can capture.
by Zuul
Wed Jul 22, 2020 7:31 pm
Forum: Microscopes and optics
Topic: Advice new or refurbish my Zeiss?
Replies: 52
Views: 4957

Re: Advice new or refurbish my Zeiss?

Personally, there is no question what I would do. As long as a trinocular head could be purchased, I would refurb. Your budget easily allows for the purchase of some really fine objectives and there must be a path to upgraded illumination.
by Zuul
Wed Jul 22, 2020 7:25 pm
Forum: Home-made microscope adaptations
Topic: Microstar IV LED Illuminator
Replies: 22
Views: 2280

Re: Microstar IV LED Illuminator

Is there an optical performance penalty for not employing the remote lamp house? There might be. In a microscope that has collimating lenses in the base, the lamp should be positioned accordingly to provide Kohler illumination. Removal of the external lamp housing that changes the distance between ...
by Zuul
Wed Jul 22, 2020 5:39 pm
Forum: Home-made microscope adaptations
Topic: Microstar IV LED Illuminator
Replies: 22
Views: 2280

Re: Microstar IV LED Illuminator

I want to discuss one other potential benefit of LED because it's the one most appealing to me. It lies somewhere between conserved energy and sample heating. Remote lamp houses are required for 100W systems to manage excess heat. If the same intensity of light can be obtained with LEDs using 1/5 or...
by Zuul
Tue Jul 21, 2020 7:51 pm
Forum: Beginner's corner
Topic: How do you collect diatoms.
Replies: 4
Views: 1168

Re: How do you collect diatoms.

This thread has a great deal of detail on the subject. The process is complex and difficult with no small amount of artistry!

http://www.microbehunter.com/microscop ... =10&t=9466
by Zuul
Mon Jul 20, 2020 2:44 pm
Forum: My microscope
Topic: Converting a Nice BH-2 into a Nasty Frankenscope??
Replies: 27
Views: 3399

Re: Converting a Nice BH-2 into a Nasty Frankenscope??

Looking back over this post, I can see where the pix alone make the machining setup look funky. But tell you what, if you had been there observing in person, I'm sure you'd have agreed it was perfectly okay. Also, a master machinist and owner of the shop I did the work in looked it over before I st...
by Zuul
Mon Jul 20, 2020 1:59 am
Forum: Pictures and Videos
Topic: A Few Diatom Pictures
Replies: 8
Views: 1203

Re: A Few Diatom Pictures

Beautiful!
by Zuul
Mon Jul 20, 2020 12:36 am
Forum: Home-made microscope adaptations
Topic: Microstar IV LED Illuminator
Replies: 22
Views: 2280

Re: Microstar IV LED Illuminator

Would there be any chance you would have any photographic files previously done with the 24 watt halogen system, that you could diplicate with your led retrofit and make a comparison image? A prepared slide perhaps? If I pick up another stand (as seams increasing likely) I should be able to do a co...