Search found 1297 matches

by PeteM
Wed Nov 25, 2020 1:55 am
Forum: Beginner's corner
Topic: Tripod exanding and contracting with 3°C temp swings when shooting timelapses at 5x?
Replies: 1
Views: 22

Re: Tripod exanding and contracting with 3°C temp swings when shooting timelapses at 5x?

A few thoughts: 1) You seem to have narrowed it down to thermal changes affecting your tripod, so let's take that as a starting point. I'd just note that there are dozens of possible causes and we sometimes see cause and effect where there is none. Might be best if your thermometer measured the trip...
by PeteM
Tue Nov 24, 2020 1:52 am
Forum: My microscope
Topic: New microscope, choosing drives me crazy
Replies: 17
Views: 224

Re: New microscope, choosing drives me crazy

The dealer you spoke to is correct that the low end Zeiss, Leica, etc. are now often made in China to now higher standard than, say, a Motic. I'd suggest patience and finding a fine used microscope. I don't know the used pricing throughout Europe, but here in the US the equivalent of 2000 Euro would...
by PeteM
Sun Nov 22, 2020 11:47 pm
Forum: My microscope
Topic: New microscope, choosing drives me crazy
Replies: 17
Views: 224

Re: New microscope, choosing drives me crazy

Your budget would buy you a high quality research microscope (used), perhaps even with DIC and top notch objectives in the US. I'd be inclined to see what's available used in your area. As a comparison example, I recently had a Motic BA410 with trinocular head and fluor objectives in new condition; ...
by PeteM
Sun Nov 22, 2020 5:11 pm
Forum: Microscopes and optics
Topic: Interesting Attachment......ID???
Replies: 9
Views: 143

Re: Interesting Attachment......ID???

Looks to me like it's meant for a low profile knob, to engage the gear rack. Knob and its gear engagement not present - perhaps meant to be removable for an even lower profile while rotating a specimen? Almost surely not for a LED, needle manipulator, etc. The usual attachment method is with two gui...
by PeteM
Sat Nov 21, 2020 8:53 pm
Forum: Beginner's corner
Topic: Bertrand lens
Replies: 3
Views: 85

Re: Bertrand lens

A Bertrand lens is usually built in to a microscope - and focused so you can see (and adjust) the alignment of things like phase rings and phase annulli in a phase contrast microscope. A centering or phase telescope - which replaces an eyepiece - does the same thing. Because the focus point is adjus...
by PeteM
Fri Nov 20, 2020 2:38 am
Forum: Microscopes and optics
Topic: What microscope has this style?
Replies: 56
Views: 716

Re: What microscope has this style?

Here's an affordable spectrometer that claims to get to 920nm into the near IR range: https://www.ebay.com/itm/Spectrometer-Spectrometre-Spektrometre-with-SMA-connector-Extended-Range-920nm/283947908442?hash=item421c9d3d5a:g:VSkAAOSwGmteke1h I bought a similar spectrometer, similarly priced, from a ...
by PeteM
Thu Nov 19, 2020 7:14 pm
Forum: My microscope
Topic: Microscopy on a budget
Replies: 2
Views: 97

Re: Microscopy on a budget

Sounds like you're off to a great start.
by PeteM
Thu Nov 19, 2020 7:10 pm
Forum: Microscopes and optics
Topic: Issue with 2x and 1x objectives
Replies: 6
Views: 102

Re: Issue with 2x and 1x objectives

Depending upon your microscope, that field limitation is likely due to the condenser not covering the entire field. Open up all the irises and drop it down to see if that helps. Some condensers will only cover a 10x objective, better ones will go down to 4x. As Phil says, it's often necessary to get...
by PeteM
Thu Nov 19, 2020 7:04 pm
Forum: Microscopes and optics
Topic: What microscope has this style?
Replies: 56
Views: 716

Re: What microscope has this style?

If you need transmitted light for some reason (as in the Omax type), it should be noted the Ebay BHM model is only for a reflected head. The BHM is a good stand. There are many other fine microscope stands that might be easier to adapt (which a bit more meat on the upright and sometimes a detachable...
by PeteM
Thu Nov 19, 2020 7:44 am
Forum: Microscopes and optics
Topic: What microscope has this style?
Replies: 56
Views: 716

Re: What microscope has this style?

The base, illumination, and stage look somewhat like an Omax or another fairly low cost Chinese scope. You might check "Omax" as an example in the $200 to $300 price range. The upright (beginning about 20mm above the stage height) and the head support (held by 3 socket head screws) don't look famili...
by PeteM
Tue Nov 17, 2020 1:34 am
Forum: My microscope
Topic: Olympus FHT
Replies: 6
Views: 212

Re: Olympus FHT

The old Olympus scopes are pretty well built. So once you free up the old grease, I think you'll have a good scope. The relatively small footprint should make it a good travel scope. A LED conversion should be fairly easy as well and while the objectives are fairly old "short barrel" models you can ...
by PeteM
Tue Nov 17, 2020 1:32 am
Forum: My microscope
Topic: Labomed LX400
Replies: 5
Views: 172

Re: Labomed LX400

I've come across some objectives (not an entire scope - which looks fairly cheaply made). They were usable, not great. If I had $600 to spend on a scope, would probably look elsewhere than a used LX400. Some of the Labomed stuff is made in India. Do you know the origin of the scopes you used at scho...
by PeteM
Sun Nov 15, 2020 10:02 pm
Forum: Beginner's corner
Topic: Which to choose?
Replies: 9
Views: 1066

Re: Which to choose?

Chris, Congratulations on the Leica DMLS - it's an excellent scope and looks like the 20x you bought should be superb.

I'd be curious to know what things end up interesting your son (and you) the most.
by PeteM
Sat Nov 14, 2020 5:35 pm
Forum: For forum members who want to buy and sell equipment
Topic: Wild phase objectives - swap
Replies: 7
Views: 650

Re: Wild phase objectives - swap

Patta - PM sent. I don't need the 40x phase. The 50x phase is of possible use and I have the 50/100x annulus; but I already have a 4 place turret full of 10-20-40x phase and a100x fluor phase objectives. The scope will likely go on to a "Micronaut's" family at some point. I just need to find a bette...
by PeteM
Fri Nov 13, 2020 10:20 pm
Forum: For forum members who want to buy and sell equipment
Topic: Wild phase objectives - swap
Replies: 7
Views: 650

Re: Wild phase objectives - swap

FWIW, I believe the original poster's intent in "phasing out" his 50x objective is to just remove the phase ring - and use the rest of the objective. Small loss. This works fine on converting something like a Nikon CFN 4x for inverted phase use to a regular CFN 4x for upright use. A few minutes work...
by PeteM
Fri Nov 13, 2020 5:10 pm
Forum: My microscope
Topic: Things I've seen from the past but haven't seen available now.
Replies: 10
Views: 762

Re: Things I've seen from the past but haven't seen available now.

The parfocal shims, up to about .010", are still readily available for RMS objectives. They're just expensive. Parfocal extenders (threaded both ends) are also available (Ebay etc.) and especially handy for mixing infinite objectives (say Leica 45mm to a Nikon 60mm parfocal scope). As noted above --...
by PeteM
Fri Nov 13, 2020 5:03 pm
Forum: For forum members who want to buy and sell equipment
Topic: Wild phase objectives - swap
Replies: 7
Views: 650

Re: Wild phase objectives - swap

I've just finished adapting a Wild phase contrast set to a Nikon S (actually an L-Ke) microscope. Added simple polarization and LED illumination as well. The Wild phase condenser requires about a 1.5mm a larger holding diameter than the Nikon - but there is enough metal in the Nikon condenser holder...
by PeteM
Mon Nov 09, 2020 7:52 pm
Forum: Microscopes and optics
Topic: Combining short and long barrel objectives.
Replies: 10
Views: 453

Re: Combining short and long barrel objectives.

Is buying a new short barrel 20x from China not an option? The new prices of a "185" objective are very low and China subsidizes the shipping cost to most countries.
by PeteM
Sun Nov 08, 2020 9:21 pm
Forum: Microscopes and optics
Topic: Nikon E400 stage has some wiggle in the y direction, anyone know how to fix?
Replies: 7
Views: 1194

Re: Nikon E400 stage has some wiggle in the y direction, anyone know how to fix?

John - curious on the bearings used in various Nikon infinite scopes. My limited experience (an E600 and two ME600 series scopes) is it's cross rollers for the Z direction stage and condenser mounts (up and down) and captive balls running along wires backed on one side with an adjustable gib for the...
by PeteM
Sun Nov 08, 2020 8:53 pm
Forum: Microscopes and optics
Topic: What is the difference between UplanFl and plan objectives?
Replies: 2
Views: 175

Re: What is the difference between UplanFl and plan objectives?

To add, some differences between Olympus Plan UIS (infinite) and UPlan UIS objectives, the UPlanFl will have: - larger field of view - higher numerical aperture and resolution - better chromatic corrections - better transmission into the UV region - more $$$ A second iteration of the UIS series (UIS...
by PeteM
Sun Nov 08, 2020 1:46 am
Forum: Microscopes and optics
Topic: Nikon E400 stage has some wiggle in the y direction, anyone know how to fix?
Replies: 7
Views: 1194

Re: Nikon E400 stage has some wiggle in the y direction, anyone know how to fix?

The spacing between the rack and pinion gears for both x and y are adjustable. This gets out most of the slop - but you do want a bit of clearance. By using a suitable grease and adjusting the gibs you can damp any further "wiggle."
by PeteM
Sat Nov 07, 2020 6:15 pm
Forum: Sandbox
Topic: Do we need Phase Contrast?
Replies: 37
Views: 1822

Re: Do we need Phase Contrast?

Simple polarization, darkfield, and oblique are other and usually less expensive ways of adding contrast.

Phase contrast is excellent for relatively transparent cells (DIC even more so), but typically adds hundreds to the cost of a microscope. DIC even more.
by PeteM
Thu Nov 05, 2020 8:20 pm
Forum: My microscope
Topic: Carlsan Microscope?
Replies: 16
Views: 606

Re: Carlsan Microscope?

To add, the corner is more damaged than I thought. You might try embedding a bit of stainless mesh in epoxy for that larger repair. Use a bit of waxed plastic to establish the outside surface. The epoxy almost like stucco applied to mesh.
by PeteM
Thu Nov 05, 2020 8:18 pm
Forum: My microscope
Topic: Carlsan Microscope?
Replies: 16
Views: 606

Re: Carlsan Microscope?

The heat (a problem with this lamp location) was why you might consider a LED replacement if you enjoy that sort of project.
by PeteM
Thu Nov 05, 2020 7:15 pm
Forum: My microscope
Topic: Carlsan Microscope?
Replies: 16
Views: 606

Re: Carlsan Microscope?

The "P" might stand for Plan. You may find some electrical components marked Japan or China if you want to narrow down your country of origin. The older Japanese Micromasters were pretty decent. The Chinese ones OK for the price. The bright spot is fairly common with this sort of system with the bul...
by PeteM
Thu Nov 05, 2020 6:37 pm
Forum: My microscope
Topic: Carlsan Microscope?
Replies: 16
Views: 606

Re: Carlsan Microscope?

I'm not familiar with "Carlsan" but it looks very much like a generic microscope of the sort sold as a Fisher Micromaster etc. -- first made in Japan and then China. Where was yours made? It should be pretty decent for under $100 or so. Better built than a new $200 scope. The fine and coarse focus w...
by PeteM
Thu Nov 05, 2020 3:31 pm
Forum: Beginner's corner
Topic: Various eye pieces
Replies: 4
Views: 238

Re: Various eye pieces

Depends on whether your microscope requires eyepiece corrections. Generally, you'll get better resolution by choosing a higher power objective than going from a 10x to 20x eyepiece. If it's just for visual observation, just try them and decide what you like. For taking photos, then the possible need...
by PeteM
Tue Nov 03, 2020 3:46 am
Forum: Microscopes and optics
Topic: Field of View - Zeiss Universal vs. Leitz Orthoplan
Replies: 15
Views: 9787

Re: Field of View - Zeiss Universal vs. Leitz Orthoplan

I've found the same issue with an older Leitz super widefield head. Eye position is very unforgiving. However, a newer Leica (DMLB and DMRB) and a Nikon (Eclipse ME600) with a 25mm plus fields of view offer highly immersive and comfortable views. So, I'd say much depends on the design of the eyepiec...
by PeteM
Mon Nov 02, 2020 9:17 pm
Forum: Pictures and Videos
Topic: First light with EPI DIC
Replies: 4
Views: 745

Re: First light with EPI DIC

Cool image. I suspect it might be spectacular with focus stacking? Agree with Scarodactyl on the value of reflected light microscopy. Amateurs have spent over 150 years learning how to prepare specimens for transmitted light. Seems that today's near glut of high quality wafer inspection microscopes,...