Search found 341 matches

by wporter
Wed Jul 08, 2020 2:38 am
Forum: Camera systems and imaging
Topic: Bausch & Lomb Balplan Camera Tube
Replies: 30
Views: 604

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...
by wporter
Tue Jul 07, 2020 6:57 pm
Forum: Camera systems and imaging
Topic: Bausch & Lomb Balplan Camera Tube
Replies: 30
Views: 604

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...
by wporter
Thu Jul 02, 2020 10:59 pm
Forum: Microscopes and optics
Topic: B&L Balplan
Replies: 27
Views: 1487

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...
by wporter
Thu Jul 02, 2020 4:43 pm
Forum: Microscopes and optics
Topic: B&L Balplan
Replies: 27
Views: 1487

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...
by wporter
Wed Jul 01, 2020 9:11 pm
Forum: Microscopes and optics
Topic: Breaking the baffling B & L Balplan buffalo.
Replies: 92
Views: 6560

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.)
by wporter
Wed Jul 01, 2020 6:30 pm
Forum: Microscopes and optics
Topic: B&L Balplan
Replies: 27
Views: 1487

Re: B&K Balplan

More:
IMG_20200701_074559-1024x1024.jpg
IMG_20200701_074559-1024x1024.jpg (121.4 KiB) Viewed 1269 times
IMG_20200701_074548-1024x1024.jpg
IMG_20200701_074548-1024x1024.jpg (132.05 KiB) Viewed 1269 times
IMG_20200701_074615-1024x1024.jpg
IMG_20200701_074615-1024x1024.jpg (93.13 KiB) Viewed 1269 times
IMG_20200701_074710-1024x1024.jpg
IMG_20200701_074710-1024x1024.jpg (186.59 KiB) Viewed 1269 times
IMG_20200701_074738-1024x1024.jpg
IMG_20200701_074738-1024x1024.jpg (176.11 KiB) Viewed 1269 times
by wporter
Wed Jul 01, 2020 6:26 pm
Forum: Microscopes and optics
Topic: B&L Balplan
Replies: 27
Views: 1487

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...
by wporter
Wed Jul 01, 2020 4:51 am
Forum: Microscopy accessories
Topic: B&L Balplan Pol Adapter
Replies: 12
Views: 449

Re: B&L Balplan Pol Adapter

No, it has a big lens on the wider end.
by wporter
Wed Jul 01, 2020 3:55 am
Forum: Microscopy accessories
Topic: B&L Balplan Pol Adapter
Replies: 12
Views: 449

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...
by wporter
Wed Jul 01, 2020 3:22 am
Forum: Microscopes and optics
Topic: B&L Balplan
Replies: 27
Views: 1487

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.
by wporter
Wed Jul 01, 2020 1:46 am
Forum: Microscopes and optics
Topic: Breaking the baffling B & L Balplan buffalo.
Replies: 92
Views: 6560

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.
by wporter
Tue Jun 30, 2020 9:25 pm
Forum: Microscopes and optics
Topic: Breaking the baffling B & L Balplan buffalo.
Replies: 92
Views: 6560

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 ...
by wporter
Tue Jun 30, 2020 8:57 pm
Forum: Microscopy accessories
Topic: B&L Balplan Pol Adapter
Replies: 12
Views: 449

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 ...
by wporter
Tue Jun 30, 2020 4:32 pm
Forum: Microscopes and optics
Topic: B&L Balplan
Replies: 27
Views: 1487

Re: B&K Balplan

No. They are Planachromat, BF/DF Met.

I'll upload pix later of the epi lenses.
by wporter
Tue Jun 30, 2020 2:14 am
Forum: Illumination Techniques
Topic: Incident illumination
Replies: 37
Views: 1983

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.
by wporter
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: 309

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...
by wporter
Fri Jun 26, 2020 9:54 pm
Forum: Microscopes and optics
Topic: Best DIC options?
Replies: 57
Views: 2396

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...
by wporter
Fri Jun 26, 2020 8:27 pm
Forum: Microscopes and optics
Topic: B&L Balplan
Replies: 27
Views: 1487

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 ...
by wporter
Fri Jun 26, 2020 7:04 pm
Forum: Microscopes and optics
Topic: B&L Balplan
Replies: 27
Views: 1487

Re: B&K Balplan

Here are some pix of the Balplan epi illuminator and DIC attachment. Also shown is the camera adapter (with a cable release hanging off it; the shutter inside hasn't been removed, so needs to be opened manually when a digital camera is used on top of the adapter. balplan1-1024x1024.jpg balplan2-1024...
by wporter
Fri Jun 26, 2020 5:30 am
Forum: Microscopes and optics
Topic: Best DIC options?
Replies: 57
Views: 2396

Re: Best DIC options?

I'd be curious to see the DIC set-up
microb

Sure; I'll post some images tomorrow on the other thread (Balplan)
by wporter
Thu Jun 25, 2020 10:11 pm
Forum: Microscopes and optics
Topic: Best DIC options?
Replies: 57
Views: 2396

Re: Best DIC options?

Hi Pete, I have the following DIC systems, some of which I have a lot of experience with, and some that remain subjects for deeper investigation when time permits: Reflected: Balplan Zeiss Universal Univar Transmitted: Univar Zeiss Jena Sedival (an inverted scope) I haven't done extensive toe-to-toe...
by wporter
Mon Jun 22, 2020 5:24 am
Forum: Camera systems and imaging
Topic: Microstar IV Camera Setup
Replies: 18
Views: 1897

Re: Microstar IV Camera Setup

Maybe there's a glaring mistake I'm making? Yes, perhaps. You are missing the shutter/photocell housing which goes on top of the trino head, and one of the various lens systems (1762, 1763, 1764, or 1768) that goes on top of the shutter housing. Not sure how much compensation or correction these la...
by wporter
Thu Jun 11, 2020 1:38 am
Forum: My microscope
Topic: WILD HEERBRUGG (17250) microscope.
Replies: 2
Views: 539

Re: WILD HEERBRUGG (17250) microscope.

Also, the 100x objective may be obscured by old dried oil on the specimen-end lens, a common problem which can be cured by cleaning with lens cleaner now and after each immersion-oil session.
by wporter
Tue Jun 09, 2020 5:46 pm
Forum: Microscopes and optics
Topic: Breaking the baffling B & L Balplan buffalo.
Replies: 92
Views: 6560

Re: Breaking the baffling B & L Balplan buffalo.

While you could use your hands to push the hot glass lens elements apart, what I did once, successfully, was to place a spring clamp diagonally across the corners of the two elements to get a shearing force, then submerged the whole thing in water to boil slowly (although I suppose you could use any...
by wporter
Tue Jun 09, 2020 2:30 am
Forum: Pictures and Videos
Topic: Fresh water diatoms
Replies: 19
Views: 1229

Re: Fresh water diatoms

Thanks to Apo for the question, and Charles for the excellent detailed reply, and the very illustrative before-and-after images; an excellent presentation. A much less honest person might have said, "That's the raw shot, of course. Doesn't your DIC look like that?" Lol. But seriously, this is the ki...
by wporter
Mon Jun 08, 2020 7:10 pm
Forum: Introduce yourself
Topic: Bio Major (advice on future career and academic goals)
Replies: 28
Views: 1331

Re: Bio Major (advice on future career and academic goals)

What is the hardest part about being a bio major? The hardest part of any college regimen is possibly just putting up with the courses that you have no interest in, but must complete anyway. Part of the rite-of-passage that is going to college: proving to future employers that you can do the work a...
by wporter
Mon Jun 08, 2020 6:48 pm
Forum: Introduce yourself
Topic: Bio Major (advice on future career and academic goals)
Replies: 28
Views: 1331

Re: Bio Major (advice on future career and academic goals)

May I ask about yourself? Are you in a bio related field? What got you into this forum? I'm a 70-yr-old retired engineer who likes to fuss with microscopes, and got my bio degree (M.S.) late in life (at 55!), as what might be called a lifelong learner, at the local Cal State campus (and was self-em...
by wporter
Mon Jun 08, 2020 4:57 pm
Forum: My microscope
Topic: Microscope (Beginner type)
Replies: 5
Views: 642

Re: Microscope (Beginner type)

Forum guru PeteM lives near the Bay Area, so would know what is available near you, and has also put together a very nice comprehensive pdf on microscope brands that he will provide if you ask him. Also the subject has been dealt with many times here, you might try searching the forum for similar po...
by wporter
Mon Jun 08, 2020 3:35 am
Forum: Introduce yourself
Topic: Bio Major (advice on future career and academic goals)
Replies: 28
Views: 1331

Re: Bio Major (advice on future career and academic goals)

OK, that's good information. You might at least temporarily hook up with a state agency or the like as a helper-tester/nasal-swabber at a coronavirus testing station, perhaps as an intern or even a volunteer at a local hospital. At least in the near-term; and I know it sounds funny, but it can be an...
by wporter
Mon Jun 08, 2020 2:03 am
Forum: Introduce yourself
Topic: Bio Major (advice on future career and academic goals)
Replies: 28
Views: 1331

Re: Bio Major (advice on future career and academic goals)

Whereabouts are you located? What city do you plan to go to the 4-yr Uni in? This has something to do with what answers you will get.