Search found 3259 matches

by apochronaut
Fri Jul 10, 2020 2:12 pm
Forum: Microscopes and optics
Topic: Roughly when did microscope manufacturers stop making their own glass?
Replies: 9
Views: 119

Re: Roughly when did microscope manufacturers stop making their own glass?

Fuel would have been in abundance anywhere in Ontario. Midland had a population of about 4-5,000 then, a small town, with a few wharves for grain boats. If one thinks of coal as a prime reason, then an obvious choice would have been Hamilton or St. Catherines or Burlington, or Toronto where there wo...
by apochronaut
Fri Jul 10, 2020 12:36 pm
Forum: Microscopes and optics
Topic: Roughly when did microscope manufacturers stop making their own glass?
Replies: 9
Views: 119

Re: Roughly when did microscope manufacturers stop making their own glass?

Second part of the question is: More specifically , it would have at one point been necessary to locate one's operations in proximity to a desirable sand resource. Certainly, sand as a commodity could be purchased but it would have to be shipped and overseeing the grade of it would be transferred to...
by apochronaut
Fri Jul 10, 2020 1:45 am
Forum: Specimens, samples and slides
Topic: Where Can I Find Ciliates without Any Creeks or Ponds?
Replies: 10
Views: 129

Re: Where Can I Find Ciliates without Any Creeks or Ponds?

Don. You have posted some photos of Goldeye bones. Presumably you had a Winnipeg Goldeye in hand and can get another. There is your goldmine of cultures. Cut off a chunk of tail , gills , scales or fins and culture them briefly with a bit of sugar....10-20 grains or so. Then strain off the fish part...
by apochronaut
Thu Jul 09, 2020 11:27 pm
Forum: Microscopes and optics
Topic: Euromex or Motic?
Replies: 54
Views: 446

Re: Euromex or Motic?

That's a pretty dismal image. Tons of spherical aberration and increasing off axis ca.....especially for a 20X of only .4 N.A., which should have some resistance to spherical aberration due to the low N.A. Reports of people using infinity objectives in finite systems successfully and visa versa are ...
by apochronaut
Thu Jul 09, 2020 11:04 am
Forum: Microscopes and optics
Topic: Focus loss upon microscope stage movement
Replies: 17
Views: 502

Re: Focus loss upon microscope stage movement

It isn't an uncommon way but since the stage is cantilevered , the mount is usually much more substantial than that. When you put out you're casting call for subjects you will have to stipulate: NO OVERWEIGHT PROTISTS! You are being taken advantage of. How could you be responsible for that? I would ...
by apochronaut
Thu Jul 09, 2020 10:54 am
Forum: Microscopes and optics
Topic: Fixed Köhler
Replies: 45
Views: 945

Re: Fixed Köhler

They must have a lot of faith in their ability to churn out absolutely parfocal objectives: one after another after another after another after another. seems to me they know it doesn't really matter anyway and all the customer needs is the buzzword to make them happy. they can unpack it and point i...
by apochronaut
Wed Jul 08, 2020 10:23 pm
Forum: Camera systems and imaging
Topic: Bausch & Lomb Balplan Camera Tube
Replies: 17
Views: 152

Re: Bausch & Lomb Balplan Camera Tube

Those eyepieces marked W.F. 22 are not 22mm f.o.v. It must be a reference to the eye relief. Same with ones marked 23, which have about a 20mm f.o.v. The W.F. 22 are listed as compensating eyepieces and probably entered the world as a wider field alternative compens eyepiece to be used with the last...
by apochronaut
Wed Jul 08, 2020 10:05 pm
Forum: Microscopy accessories
Topic: B&L Phase Contrast Condenser Sliders
Replies: 18
Views: 530

Re: B&L Phase Contrast Condenser Sliders

The slider on that Dyna condenser mount is 42mm x just a little over 9.5mm deep, so not very far off. The bottom of the channel is actually provided by several cylinder head screws, so they can be backed off to provide more depth. The open port itself is 33.5mm and it has a lip to receive a filter o...
by apochronaut
Wed Jul 08, 2020 8:24 pm
Forum: Microscopes and optics
Topic: Some problems with my microscope
Replies: 11
Views: 187

Re: Some problems with my microscope

Well, the condenser is cheap, high NA and of metal construction, I'm a fan of rare looking equipment. It comes with its own stand, but if there is a problem I would rather use an Olympus. :D Regarding the BH2 vs Infinity scopes, the newer objectives have improved coatings, aspherical elements and s...
by apochronaut
Wed Jul 08, 2020 6:10 pm
Forum: Microscopy accessories
Topic: B&L Phase Contrast Condenser Sliders
Replies: 18
Views: 530

Re: B&L Phase Contrast Condenser Sliders

Wait, am I missing a second interior lens here? It just has the top one and bunch of unused internal threading for something. Yes, there is supposed to be a second lens in there and a retainer. My question was about your 20X annulus slider. I am wondering if it might be the same dimensions as the s...
by apochronaut
Wed Jul 08, 2020 3:51 pm
Forum: Microscopes and optics
Topic: Some problems with my microscope
Replies: 11
Views: 187

Re: Some problems with my microscope

Why are you looking at a Zeiss condenser to put on an Olympus? A second question is: why do you think that modern infinity microscopes are a pinnacle that older microscopes need to be compared to?
by apochronaut
Wed Jul 08, 2020 12:57 pm
Forum: Microscopy accessories
Topic: B&L Phase Contrast Condenser Sliders
Replies: 18
Views: 530

Re: B&L Phase Contrast Condenser Sliders

Maybe for the insert you have it might work. That is for the 160mm Dyna series. What are the dimensions of that insert? I have a condenser from a Flat Field Dyna series here that has a slider. The slider has a lens on one side and an open hole on the other. I assume the open hole is for higher power...
by apochronaut
Wed Jul 08, 2020 12:01 pm
Forum: Microscopes and optics
Topic: Euromex or Motic?
Replies: 54
Views: 446

Re: Euromex or Motic?

"£2000 is a very generous budget within the used microscope market, and I mean very generous! You can get a good quality used microscope with phase for less than half that with a little patience." That would suggest that new Euromex or Motic are poor quality? My current one was relatively cheap but...
by apochronaut
Wed Jul 08, 2020 1:18 am
Forum: Camera systems and imaging
Topic: Bausch & Lomb Balplan Camera Tube
Replies: 17
Views: 152

Re: Bausch & Lomb Balplan Camera Tube

Give the eyepiece a try. The telan lens in the system converts the infinity corrected bundle to convergent , then the eyepiece picks it up.
by apochronaut
Tue Jul 07, 2020 10:47 pm
Forum: Camera systems and imaging
Topic: Bausch & Lomb Balplan Camera Tube
Replies: 17
Views: 152

Re: Bausch & Lomb Balplan Camera Tube

I don't think it was meant for an eyepiece. B & L did make a tube like AO to take a photo eyepiece but that isn't what yoy have. The numbers on the side are magnifications to adjust sn integrated lens up or down to accomodate the frame size. Eyepieces are not meant to replace the telan lens but I th...
by apochronaut
Tue Jul 07, 2020 10:39 pm
Forum: Microscopes and optics
Topic: Euromex or Motic?
Replies: 54
Views: 446

Re: Euromex or Motic?

Have you seen good reviews of Radical scopes overall? I have only seen one iirc, but it was very negative. on-line reviews aren't exactly where I go go for information. I got better service on ebay than usual from Radical. They had a planfluorite objective on my doorstep in 6 days.....13.00 and I c...
by apochronaut
Tue Jul 07, 2020 10:07 pm
Forum: Microscopes and optics
Topic: AO/Reichert One-Fifty vs. Reichert-Jung Series 150 differences and head compatibility
Replies: 12
Views: 97

Re: AO/Reichert One-Fifty vs. Reichert-Jung Series 150 differences and head compatibility

The symptoms you describe are typical of those created due to an improperly corrected telan lens, or eyepiece. The 1730 to 1737 series of objectives were definitely advancements but the 1128 should still be evenly corrected across the field. The 1128 was the last 34mm planachro they made and was off...
by apochronaut
Tue Jul 07, 2020 9:29 pm
Forum: Microscopy accessories
Topic: B&L Phase Contrast Condenser Sliders
Replies: 18
Views: 530

Re: B&L Phase Contrast Condenser Sliders

Those insert annuli are for the L.W.D. phase system. It does use the standard phase objectives, so it is probably only medium working distance. I have the Balplan phase system in it's entirety. It is a good system. I am not sure what other condenser would duplicate the focal point of that phase con...
by apochronaut
Tue Jul 07, 2020 7:34 pm
Forum: Camera systems and imaging
Topic: Bausch & Lomb Balplan Camera Tube
Replies: 17
Views: 152

Re: Bausch & Lomb Balplan Camera Tube

The Balplan eyepieces are maybe not quite neutral. Comparing the AO/ Reichert 181 eyepieces used on the series 400, to the 31-15-61 eyepieces catalogued for the Balplan, shows some curvature of field with the 181s but the edge correction otherwise is pretty good. It actually looks like a good plan f...
by apochronaut
Tue Jul 07, 2020 7:06 pm
Forum: Microscopes and optics
Topic: Euromex or Motic?
Replies: 54
Views: 446

Re: Euromex or Motic?

One big difference is that Euromex is a broker and Motic is a manufacturer. Motic were originally in Hong Kong, so were outside of the maelstrom of Chinese industrial organization but they have no doubt had to capitulate to the requirements of the Chinese planned economy, where beaurocracy often det...
by apochronaut
Tue Jul 07, 2020 6:34 pm
Forum: Microscopes and optics
Topic: AO/Reichert One-Fifty vs. Reichert-Jung Series 150 differences and head compatibility
Replies: 12
Views: 97

Re: AO/Reichert One-Fifty vs. Reichert-Jung Series 150 differences and head compatibility

Does the trinoc produce a well corrected image on the 410? (through one eypiece ... I know you said there was some issue there) If so, I think that answered the question. If the 150 were from an educational venue (likely) they may have been ordered that way simply to hit their budget. Students can ...
by apochronaut
Tue Jul 07, 2020 6:09 pm
Forum: Microscopes and optics
Topic: AO/Reichert One-Fifty vs. Reichert-Jung Series 150 differences and head compatibility
Replies: 12
Views: 97

Re: AO/Reichert One-Fifty vs. Reichert-Jung Series 150 differences and head compatibility

I don't have a lot of experience with the 150 . I have tended to sidestep them in favour of the more professional stands. The 150 has a limited illumination system and condenser but it still could be equipped with a 4 objective phase system, so it must have been o.k. The nice thing about them is tha...
by apochronaut
Tue Jul 07, 2020 5:25 pm
Forum: Microscopes and optics
Topic: Please help a microscope noob with objectives
Replies: 14
Views: 128

Re: Please help a microscope noob with objectives

Did you not get the lego set you wanted when you were 4 or something?
by apochronaut
Tue Jul 07, 2020 12:56 pm
Forum: Microscopes and optics
Topic: AO/Reichert One-Fifty vs. Reichert-Jung Series 150 differences and head compatibility
Replies: 12
Views: 97

Re: AO/Reichert One-Fifty vs. Reichert-Jung Series 150 differences and head compatibility

The depression below the dovetail is designed to take an extension on the head of the original 150/160, that carries the telan lens. I don't know the Reichert-Jung version of that scope well but I see threads down in that well. Has the telan lens been removed from the head on those and installed abo...
by apochronaut
Tue Jul 07, 2020 11:58 am
Forum: Camera systems and imaging
Topic: Bausch & Lomb Balplan Camera Tube
Replies: 17
Views: 152

Re: Bausch & Lomb Balplan Camera Tube

Your example above looks like an older version of the camera adapter. There is supposed to be à lens in the top of that tube. Is there any evidence of it having been removed? In literature, they do make reference to " the camera lens". The knob with markings from 0 to 25, on other models starts at 3...
by apochronaut
Tue Jul 07, 2020 4:13 am
Forum: Camera systems and imaging
Topic: Bausch & Lomb Balplan Camera Tube
Replies: 17
Views: 152

Re: Bausch & Lomb Balplan Camera Tube

There is a lens. I do have an old polaroid system somewhere. I think it is in an intermediate tube attached to the camera back. I will have to find it.
by apochronaut
Tue Jul 07, 2020 4:03 am
Forum: Microscopes and optics
Topic: Breaking the baffling B & L Balplan buffalo.
Replies: 92
Views: 5304

Re: Breaking the baffling B & L Balplan buffalo.

What is the overall focal lebgth of the lens? It might be interesting to experiment with a normal achromat to get a sense of how vital corrections are--not volunteering to do it myself though, not right now anyway. It's the back lens group of all of the objectives, applies 5X magnification to them ...
by apochronaut
Tue Jul 07, 2020 3:54 am
Forum: Microscopes and optics
Topic: Breaking the baffling B & L Balplan buffalo.
Replies: 92
Views: 5304

Re: Breaking the baffling B & L Balplan buffalo.

Scarodactyl wrote:
Tue Jul 07, 2020 3:41 am
What is the overall focal lebgth of the lens? It might be interesting to experiment with a normal achromat to get a sense of how vital corrections are--not volunteering to do it myself though, not right now anyway.
I think someone tried that a while ago.
by apochronaut
Tue Jul 07, 2020 3:29 am
Forum: Microscopes and optics
Topic: Breaking the baffling B & L Balplan buffalo.
Replies: 92
Views: 5304

Re: Breaking the baffling B & L Balplan buffalo.

It is item 21 but in figure 2 of the 481665 patent. The specifications are from line 30 on page 4 to the middle of page 5. I don't think the doublet would involve a crown glass element. Both n's are high, with fairly low abbe #'s. According to charts, the double convex element would be something lik...