Search found 353 matches
- Mon Jan 25, 2021 7:00 pm
- Forum: Beginner's corner
- Topic: Reichert received and a question
- Replies: 39
- Views: 12620
Re: Reichert received and a question
Haven't been watching the forum much lately so I missed this thread until now. But I've done this repair before and used these bearings from McMaster-Carr: Diastar or Microstar 4 focus cam follower: type R2-5-2Z (also known as R2-5-ZZ or Dynaroll Corp. SR2-5ZZ A5), McM-C stock number 57155K366, 440C...
- Wed Nov 11, 2020 7:49 pm
- Forum: Beginner's corner
- Topic: What is this? Noobs first day!
- Replies: 13
- Views: 5968
Re: What is this? Noobs first day!
Forum member Apochronaut lives in Canada and may be able to assist you with finding a higher-grade used microscope for a good price.
- Sat Oct 17, 2020 3:55 am
- Forum: Microscopes and optics
- Topic: Understanding Microscope Patents
- Replies: 60
- Views: 18101
Re: Understanding Microscope Patents
Apo (if I can put words in his mouth) was talking about the wide light sources of old-time microscopes that used critical illumination: the sun, a cloud, an oil-lamp flame, or indeed, one of the older filaments seen in some light bulbs from the 50's-60's that were actually strips of tungsten that mi...
- Sat Oct 17, 2020 2:43 am
- Forum: Microscopes and optics
- Topic: Understanding Microscope Patents
- Replies: 60
- Views: 18101
Re: Understanding Microscope Patents
Right, it doesn't make any difference in critical illumination where the field iris is placed, if the illumination after the frosting is collimated. It could be 10 feet away. The frosting is placed as close to the lamp as possible to make it as bright as possible. The iris is after the frosting to c...
- Sat Oct 17, 2020 12:09 am
- Forum: Microscopes and optics
- Topic: Understanding Microscope Patents
- Replies: 60
- Views: 18101
Re: Understanding Microscope Patents
Apo is correct. If you have a frosted glass, you are using 'critical illumination', which is what the 410 uses: the frosted glass, making an evenly-lit field, is right before the field iris which is to be conjugate with the specimen. Look upon the frosted glass as 'the filament' in this kind of syst...
- Wed Oct 14, 2020 10:04 pm
- Forum: Microscopy accessories
- Topic: A must have accessory, only 24.95.
- Replies: 4
- Views: 3125
Re: A must have accessory, only 24.95.
Certainly wins on cuteness...
- Wed Oct 14, 2020 6:18 pm
- Forum: Microscopy accessories
- Topic: A must have accessory, only 24.95.
- Replies: 4
- Views: 3125
Re: A must have accessory, only 24.95.
Good find. Can apparently double as a specimen press, with that flat end. But for protecting objectives, these might have potential: https://www.ebay.com/itm/Vortex-Defender-Flip-Cap-Objective-Lens-56-62-66mm-O-56/233350062006 A little large, but one can make an adapter, using, you guessed it, 3D pr...
- Wed Oct 14, 2020 12:00 am
- Forum: Specimens, samples and slides
- Topic: How to prepare and preserve tardigrades on a slide
- Replies: 14
- Views: 7231
Re: How to prepare and preserve tardigrades on a slide
Our study showed that among the nine mounting methods tested, thermal inactivation of animals at 60 °C for 30 min followed by briefly pressing the coverslip with an entomological pin produced specimens fixed optimally for morphometry and imaging (i.e. maximally stretched and levelled but not deform...
- Fri Sep 25, 2020 2:56 am
- Forum: Pictures and Videos
- Topic: Comparative sizes of bacteria and ciliate
- Replies: 5
- Views: 2553
Re: Comparative sizes of bacteria and ciliate
Bacteria and ciliates both come in a wide-range of sizes. Though the relative sizes in your example may hold up more often than not, some bacteria are larger than some ciliates. Look up the bacteria Thiomargarita namibiensis, which you can see with the naked eye (up to 750 um diameter)!
- Mon Sep 21, 2020 11:54 pm
- Forum: Illumination Techniques
- Topic: Balplan Phase COntrast Condenser
- Replies: 1
- Views: 1848
Re: Balplan Phase COntrast Condenser
The condenser in fig 12-1 has a lens below the iris.
- Sat Aug 08, 2020 11:08 pm
- Forum: Microscopes and optics
- Topic: Illumination without diffusive elements
- Replies: 17
- Views: 7139
Re: Illumination without diffusive elements
it looks like this diagram is showing four separate illumination sources that can be directed in various combinations into the transmitted/reflected paths? With so-called 'mirror housing 4', yes. I have mirror-housing 2, so am limited to choices involving hbo/xbo (on the right side of the scope) an...
- Sat Aug 08, 2020 8:56 pm
- Forum: Microscopes and optics
- Topic: Illumination without diffusive elements
- Replies: 17
- Views: 7139
Re: Illumination without diffusive elements
FWIW, here's a 'sketchy' diagram of the Univar optics, pun intended. The relay system is that horizontal path with the trapezoidal prism that loops up to the left & back.
- Wed Jul 08, 2020 2:38 am
- Forum: Camera systems and imaging
- Topic: Bausch & Lomb Balplan Camera Tube
- Replies: 30
- Views: 12109
Re: Bausch & Lomb Balplan Camera Tube
Actually, is there a lens on the bottom? No, no lens. It is just an adapter piece, apparently to another (aluminum) adapter that joins it all to the trino head. Then there is yet another adapter that would connect your camera to the top of the focus tube. You will probably never see any of these ad...
- Tue Jul 07, 2020 6:57 pm
- Forum: Camera systems and imaging
- Topic: Bausch & Lomb Balplan Camera Tube
- Replies: 30
- Views: 12109
Re: Bausch & Lomb Balplan Camera Tube
Here is the usual "focusing tube with shutter", 42-12-15, from the Balplan price list. Your shutter assembly has broken free of its mounting place; it is normally glued in via springy mounting pads to isolate the shutter action from affecting the exposure somewhat. The bottom inner tube, seen on the...
- Thu Jul 02, 2020 10:59 pm
- Forum: Microscopes and optics
- Topic: B&L Balplan
- Replies: 27
- Views: 11702
Re: B&K Balplan
OK, mystery solved. 1) The 'epi-nosepiece' I have, with the clear annular ring around the common telescope lens, is indeed for epi-darkfield; i.e., the ring is not for general epi-illumination, but rather only for darkfield illumination. The light does pass down through the BF/DF objectives in the s...
- Thu Jul 02, 2020 4:43 pm
- Forum: Microscopes and optics
- Topic: B&L Balplan
- Replies: 27
- Views: 11702
Re: B&K Balplan
There is confusion on my part as to how or whether epi can work without this epi-style nosepiece, because like you say, the BF/DF objectives are apparently more ubiquitous than that nosepiece, which doesn't seem to be referenced anywhere. So I will run some tests today with those objectives on a nor...
- Wed Jul 01, 2020 9:11 pm
- Forum: Microscopes and optics
- Topic: Breaking the baffling B & L Balplan buffalo.
- Replies: 92
- Views: 33738
Re: Breaking the baffling B & L Balplan buffalo.
Phil,
Yes, please look it up & post it here. I for one would very much appreciate it (a source for optical grade linear polarizers, since I've replaced several, and Edmund is not cheap.)
Yes, please look it up & post it here. I for one would very much appreciate it (a source for optical grade linear polarizers, since I've replaced several, and Edmund is not cheap.)
- Wed Jul 01, 2020 6:30 pm
- Forum: Microscopes and optics
- Topic: B&L Balplan
- Replies: 27
- Views: 11702
Re: B&K Balplan
More:
- Wed Jul 01, 2020 6:26 pm
- Forum: Microscopes and optics
- Topic: B&L Balplan
- Replies: 27
- Views: 11702
Re: B&K Balplan
Wow, confusion reigns. I'll let you sort it out. Here are pix of my normal 5-hole nosepiece, and the epi 4-hole, plus the objectives, and a thread view of one that's typical with the annular space around the core optics. I find it odd, too, that the manual for incident light makes no mention of this...
- Wed Jul 01, 2020 4:51 am
- Forum: Microscopy accessories
- Topic: B&L Balplan Pol Adapter
- Replies: 12
- Views: 5674
Re: B&L Balplan Pol Adapter
No, it has a big lens on the wider end.
- Wed Jul 01, 2020 3:55 am
- Forum: Microscopy accessories
- Topic: B&L Balplan Pol Adapter
- Replies: 12
- Views: 5674
Re: B&L Balplan Pol Adapter
Here are two of the B&L photo tubes (relay lens, shutter) mentioned by Apo, along with a 4x5 sheet film cone. This cone is made for the tube on the right. The tube on the left is the more modern one, and is shown with an adapter sleeve for who-knows-what. The more modern tube's small black end is lo...
- Wed Jul 01, 2020 3:22 am
- Forum: Microscopes and optics
- Topic: B&L Balplan
- Replies: 27
- Views: 11702
Re: B&K Balplan
The BF/DF met objectives also require an epi nosepiece, which has an annulus area surrounding what Phil calls the "common telescope lens" just above the objective(s). The annulus area may be a lens rather than plain glass, it is hard to tell.
- Wed Jul 01, 2020 1:46 am
- Forum: Microscopes and optics
- Topic: Breaking the baffling B & L Balplan buffalo.
- Replies: 92
- Views: 33738
Re: Breaking the baffling B & L Balplan buffalo.
The large opening is 25.45mm, the smaller is 21.68mm. The support lips are 0.54mm thick. The IDs are both 19.27mm (inner edge of the lips). The linear pol filter OD from Edmund (#54-926, $37.00) is 24.86mm (nominally 25mm). It's not their best filter, but adequate.
- Tue Jun 30, 2020 9:25 pm
- Forum: Microscopes and optics
- Topic: Breaking the baffling B & L Balplan buffalo.
- Replies: 92
- Views: 33738
Re: Breaking the baffling B & L Balplan buffalo.
Yes, I have an analyzer slide, 31-57-86, that fits inside the holder-adapter 31-57-92. I got the slide on ebay somewhere, and it came with the pol filter missing (inner opening) but having the clear glass present in the outer opening. I got a replacement pol filter from Edmund (25mm) which drops in ...
- Tue Jun 30, 2020 8:57 pm
- Forum: Microscopy accessories
- Topic: B&L Balplan Pol Adapter
- Replies: 12
- Views: 5674
Re: B&L Balplan Pol Adapter
OK, here's a big apology to all from me, I screwed up. I ran some more tests this morning on camera attachment methods to the Balplan, and found that shooting through the naked trino opening with a naked camera is not as good (at all) as through the naked eyepiece port using a 23mm eyepiece adapter ...
- Tue Jun 30, 2020 4:32 pm
- Forum: Microscopes and optics
- Topic: B&L Balplan
- Replies: 27
- Views: 11702
Re: B&K Balplan
No. They are Planachromat, BF/DF Met.
I'll upload pix later of the epi lenses.
I'll upload pix later of the epi lenses.
- Tue Jun 30, 2020 2:14 am
- Forum: Illumination Techniques
- Topic: Incident illumination
- Replies: 37
- Views: 14581
Re: Incident illumination
For a quick trial, try a rattle from an aerosol paint can; here in the U.S., they are often clear marbles of about 1 cm. They do have some bubbles.
- Sat Jun 27, 2020 4:47 pm
- Forum: Microscopes and optics
- Topic: What to do about coating damage in Ortholux trinoc head
- Replies: 4
- Views: 2794
Re: What to do about coating damage in Ortholux trinoc head
Removing a coating would be a difficult proposition, since typically the coating is harder than the glass it covers. Are you sure it's the coating that is causing the dusty-looking background? I have seen a lot of bad coatings and rarely have they caused a real bad effect on the image. It may indeed...
- Fri Jun 26, 2020 9:54 pm
- Forum: Microscopes and optics
- Topic: Best DIC options?
- Replies: 64
- Views: 25374
Re: Best DIC options?
PeteM, I compared the Univar epi DIC to that of the Balplan yesterday, putting a slide with one of those tiny IC chips under each microscope, setting up comparable mags, tuning the illuminations, etc, and rolled my wheeled workshop stool back and forth from one scope to the other repeatedly to compa...
- Fri Jun 26, 2020 8:27 pm
- Forum: Microscopes and optics
- Topic: B&L Balplan
- Replies: 27
- Views: 11702
Re: B&K Balplan
I don't. In fact, I don't recommend using that photo adapter for anything. In my limited experience, the adapter picks out a very tiny bit of the center of the field to project onto the camera, and it is very blurry. Possibly it is the wrong adapter or I'm using it wrong. It was in the photo merely ...