Search found 339 matches

by wporter
Thu Jul 12, 2018 6:07 pm
Forum: Microscopes and optics
Topic: Breaking the baffling B & L Balplan buffalo.
Replies: 74
Views: 4865

Re: Breaking the baffling B & L Balplan buffalo.

Apo, thanks for the writeup; exhaustive as usual, and much appreciated by us objective hunters. You also bring home the chaos that must have overwhelmed the microscope industry during the last quarter of the 20th century. As far as the two 100x objectives (the slightly different new-style barrels, o...
by wporter
Tue Jul 10, 2018 3:11 pm
Forum: Microscopes and optics
Topic: Breaking the baffling B & L Balplan buffalo.
Replies: 74
Views: 4865

Re: Breaking the baffling B & L Balplan buffalo.

Trying to rejuvenate a Balplan, I found this thread very illuminating. Thanks to Apo for once again for giving us a brain-dump from his extensive study of objectives. Apo, if I understand it correctly, the planachromats were the last and best of the Balplan-compatible objectives, so there is no prac...
by wporter
Sat Jun 30, 2018 2:45 pm
Forum: Illumination Techniques
Topic: A recent research article about Oblique Illumination
Replies: 23
Views: 4838

Re: A recent research article about Oblique Illumination

Thanks, MichaelG, for the great find; here are the three pages for everyone's convenience:
by wporter
Fri Jun 29, 2018 3:47 pm
Forum: Illumination Techniques
Topic: A recent research article about Oblique Illumination
Replies: 23
Views: 4838

Re: A recent research article about Oblique Illumination

Apo, I find the idea of a 'reverse iris' fascinating. Found nothing on the web except this Olympus darkfield writeup (with a picture of one, about halfway down the article): https://www.olympus-lifescience.com/en/microscope-resource/primer/techniques/darkfield/ Obviously, if the outer perimeter of t...
by wporter
Tue Jun 26, 2018 6:56 pm
Forum: Pictures and Videos
Topic: Images and comments
Replies: 19
Views: 2422

Re: Images and comments

Aenima, Make sure that you are not, in post-processing, removing colors other than those caused by CA. For instance, if you observe and image a prismatic specimen, the colors may be be from dispersion by the specimen, rather than any CA resulting from optical components. I suspect that in the great ...
by wporter
Sun Jun 24, 2018 10:20 pm
Forum: Microscopes and optics
Topic: LED flashlight makes a great Zeiss-Winkel illuminator
Replies: 17
Views: 1907

Re: LED flashlight makes a great Zeiss-Winkel illuminator

About mm vs inches, and the foot-dragging US reluctance to declare the metric system the winner (except in science), here is a gentleman who has mounted a protest in his own way: http://www.sandiegouniontribune.com/communities/north-county/sd-no-miles-lartch-20180619-story.html) Hobbyst46, here are ...
by wporter
Sat Jun 23, 2018 11:52 pm
Forum: Microscopes and optics
Topic: LED flashlight makes a great Zeiss-Winkel illuminator
Replies: 17
Views: 1907

LED flashlight makes a great Zeiss-Winkel illuminator

I bring to everyone's attention a cool serendipitous find, FWIW: I recently found an LED flashlight ('electric torch', I think, to you guys across the Pond, lol) that fits in the bottom back illumination port of my Zeiss-Winkel GFL microscope so well, with such a nice slip-fit, that one would suspec...
by wporter
Thu Jun 21, 2018 12:41 am
Forum: Off Topic
Topic: Alien Skull Found in Arizona Dig...
Replies: 11
Views: 3876

Re: Alien Skull Found in Arizona Dig...

I knew it !!
by wporter
Fri Jun 15, 2018 1:15 pm
Forum: Pictures and Videos
Topic: Trouble Identifying Microbes. (PIC)
Replies: 7
Views: 1544

Re: Trouble Identifying Microbes. (PIC)

Great links, 75 & Apo, thanks.

Itouchyou, if you're looking at the specimen at 'highest power', you should use oil immersion for much better imaging and observation. This would involve making a stained slide preparation of the bacteria, first, of course.
by wporter
Thu Jun 14, 2018 12:47 am
Forum: Camera systems and imaging
Topic: Afocal through stereo mic eyepiece test.
Replies: 22
Views: 6035

Re: Afocal through stereo mic eyepiece test.

I fabricated a decent camera mount for my Cycloptic phototube accessory. The new one makes the camera body parfocal with the view through the eyepiece. There was barely enough room to effect this, but it works well. Much more convenient. See photo #1. I also used that opportunity to check the scope ...
by wporter
Thu May 31, 2018 8:35 pm
Forum: Collecting microscopes and slides
Topic: Brasso
Replies: 9
Views: 3310

Re: Brasso

Radazz, Good job on your polishing. Looks great. Just as an aside, if you are interested in re-applying lacquer to parts of the microscope, you have a choice of using a modern lacquer, or using one formulated in accordance with more old-timey techniques. Below are two pages from my venerated copy of...
by wporter
Sun May 27, 2018 11:56 pm
Forum: Camera systems and imaging
Topic: Afocal through stereo mic eyepiece test.
Replies: 22
Views: 6035

Re: Afocal through stereo mic eyepiece test.

Hi Phil, You're absolutely correct, there is some CA there. DIsregarding the setup with the NFK 3.3x (a weird setup if there ever was one), there is some very noticeable yellow and blue edging especially in #8. So much for me trying to pass it off as bad lighting (oh, well, I tried...)! I just did s...
by wporter
Sun May 27, 2018 8:04 pm
Forum: Camera systems and imaging
Topic: Afocal through stereo mic eyepiece test.
Replies: 22
Views: 6035

Re: Afocal through stereo mic eyepiece test.

PeteM: Yes, it can be made parfocal. If I unscrew the phototube riser tube, and get my camera's ccd sensor about an inch away from the exposed phototube lens, it's all parfocal then. If you had a camera small enough in width to where it would not run into the left bino half, it could be made to work...
by wporter
Sun May 27, 2018 5:27 pm
Forum: Camera systems and imaging
Topic: Afocal through stereo mic eyepiece test.
Replies: 22
Views: 6035

Re: Afocal through stereo mic eyepiece test.

Phil: No, the FOVs are the same. That is, if you put a 10x eyepiece in the riser of the phototube, and flip the mirror to direct the light there (from the left bino half), the view through the phototube eyepiece will be parfocal with, and exactly the same as, the view through the 10x eyepiece in the...
by wporter
Fri May 25, 2018 11:34 pm
Forum: Camera systems and imaging
Topic: Afocal through stereo mic eyepiece test.
Replies: 22
Views: 6035

Re: Afocal through stereo mic eyepiece test.

I noticed the focus quality isn't the best; my fault: the scope does not have a fine-focus; I focused peering at the lcd screen on the back of the camera, not the best way (i.e., the view was not relayed to my large monitor); the steel ruler was very reflective, getting the illumination w/o glare sp...
by wporter
Fri May 25, 2018 11:16 pm
Forum: Camera systems and imaging
Topic: Afocal through stereo mic eyepiece test.
Replies: 22
Views: 6035

Re: Afocal through stereo mic eyepiece test.

More of the images:
by wporter
Fri May 25, 2018 11:14 pm
Forum: Camera systems and imaging
Topic: Afocal through stereo mic eyepiece test.
Replies: 22
Views: 6035

Re: Afocal through stereo mic eyepiece test.

Below are some test shots of a steel ruler, taken with my AO Cycloptic fitted with the Cycloptic phototube attachment, for the thread followers here who may be interested. First, though, I decided to clean the optics prior to the test shots, for the first time in the 30 years I've had the scope; the...
by wporter
Thu May 24, 2018 8:16 pm
Forum: Miscellaneous
Topic: Tool advice, please
Replies: 39
Views: 8605

Re: Tool advice, please

Here's another spanner wrench: http://www.skgrimes.com/products/spanner-wrench I actually have one of these, in the flat-blade version, procured years ago for camera lenses. Very robust. Pricey. The round-tip version would be more appropriate for the locking rings under discussion here, as long as y...
by wporter
Wed May 16, 2018 7:01 pm
Forum: Miscellaneous
Topic: Tool advice, please
Replies: 39
Views: 8605

Re: Tool advice, please

Thanks for the compliments. About the drilling: in addition to being whatever tough alloy that Proto made their socket from, when the end was cut off with the abrasive disk, the cut surface of the socket became much harder than the rest of the socket, so that there was a 'crust' that needed to be br...
by wporter
Wed May 16, 2018 1:04 pm
Forum: Miscellaneous
Topic: Tool advice, please
Replies: 39
Views: 8605

Re: Tool advice, please

Whoops, it wouldn't take all the photos; here's #1 & #2:
by wporter
Wed May 16, 2018 1:01 pm
Forum: Miscellaneous
Topic: Tool advice, please
Replies: 39
Views: 8605

Re: Tool advice, please

Sometimes it's possible to make your own tool, if the commercial ones don't fit or don't work for some reason or another. I recently had a problem with a partial Balplan chassis that I got cheap, and which had a coarse focus knob that would not turn. Removing the fine focus knob revealed that the lo...
by wporter
Tue May 15, 2018 7:29 pm
Forum: Sandbox
Topic: Image size test, disregard
Replies: 0
Views: 5352

Image size test, disregard

Test for forum size of 640x640 and 1024x1024 images:
by wporter
Tue Apr 17, 2018 2:35 pm
Forum: Microscopes and optics
Topic: [asking for help] objective lens stuck in the wheel
Replies: 10
Views: 1966

Re: [asking for help] objective lens stuck in the wheel

I have had luck using just plain acetone to break free objectives from turrets. A single drop usually works, and takes effect immediately. If it doesn't work, try the penetrating oil (you can even make your own by mixing acetone 50-50 with automatic transmission fluid), but use less than a drop and ...
by wporter
Thu Apr 12, 2018 6:13 pm
Forum: Microscopes and optics
Topic: Oils and greases for use around optical components
Replies: 3
Views: 911

Oils and greases for use around optical components

Here is a NASA compilation, v.4 from 1997, listing mass-loss and condensation results from tests done for spacecraft materials, "Outgassing Data for Selecting Spacecraft Materials": http://www.vacseal.net/wp-content/uploads/2017/09/Outgassing-Data-for-Selecting-Spacecraft-Materials-REV3.pdf An intro...
by wporter
Thu Apr 12, 2018 5:56 pm
Forum: Microscopes and optics
Topic: Disassembly of AO objective
Replies: 16
Views: 2106

Re: Disassembly of AO objective

Thanks, Phil, good point about outgassing of greases, a point I had not really thought about. Your experience is certainly one worth considering. Thanks, MikeA, for your interesting info. I have a source for a few Nye oils used by the watch & clock people (I've dabbled); don't know about the exact p...
by wporter
Thu Apr 12, 2018 2:24 am
Forum: Microscopes and optics
Topic: Disassembly of AO objective
Replies: 16
Views: 2106

Re: Disassembly of AO objective

Possibly, Phil; how old are these objectives? 30 years? That's a lot of time to get used without some maintenance, you would think. Although that green grease they used sure looked and acted 30 years old! When I reassemble them, I will use a lighter synthetic grease, in smaller amounts then what I f...
by wporter
Wed Apr 11, 2018 7:51 pm
Forum: Microscopes and optics
Topic: Disassembly of AO objective
Replies: 16
Views: 2106

Re: Disassembly of AO objective

I've disassembled three of these correction-collar AO objectives now. For the edification of those who may be interested, below are two cross-sectional schematics of the objective & inner sliding barrel. The diagrams are not to scale and the components' proportions are not correct, the better to por...