Search found 5083 matches

by Pau
Mon Sep 19, 2022 2:10 pm
Forum: Photography Through the Microscope
Topic: Diatoms imaged with 40x achromat
Replies: 2
Views: 167

Re: Diatoms imaged with 40x achromat

Excellent image quality, which achromat?
by Pau
Mon Sep 19, 2022 2:08 pm
Forum: Photography Through the Microscope
Topic: Amoeba attack
Replies: 1
Views: 108

Re: Amoeba attack

What a hunting sequence! =D>
by Pau
Mon Sep 19, 2022 12:46 am
Forum: Equipment Discussions
Topic: Generic tube lenses
Replies: 5
Views: 243

Re: Generic tube lenses

Interesting...any further info? There was a store selling unmounted 180mm triplets under the "ThermoFisher" name, these are the same as U-TLU, I cannot find the store anymore. $60 a piece I think. Edit: found it: eBay item number:234299193545 could it be Perkin Elmer? https://www.ebay.com/itm/234299...
by Pau
Sun Sep 18, 2022 12:06 pm
Forum: Equipment Discussions
Topic: Generic tube lenses
Replies: 5
Views: 243

Generic tube lenses

Browsing the Bay I found a seller offering new unmounted generic tube lenses in 180 and 200mm FL (cemented doublets) https://www.ebay.com/itm/185557839606?_trkparms=amclksrc%3DITM%26aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20160811114145%26meid%3Dcde3bdca45e446e39e6600c1443d1fb3%26pid%3D10066...
by Pau
Sun Sep 04, 2022 12:17 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Green Lacewing And "Presents" - Update Friday
Replies: 20
Views: 548

Re: Green Lacewing And "Presents" - Update Hatchlings

Wow! Excellent series, most enjoyable in special the last one showing a happy end.

Being ferocious aphid predators, would be nice seeing these larvae in action.
by Pau
Fri Sep 02, 2022 10:17 am
Forum: Equipment Discussions
Topic: 20x NeoSPlan ULWD objective quality
Replies: 10
Views: 324

Re: 20x NeoSPlan ULWD objective quality

Do/did they make a Neo/BD version?
Sure, take a look at:
http://www.foromacrosmuymacros.com/viewtopic.php?t=858
by Pau
Fri Sep 02, 2022 12:49 am
Forum: Equipment Discussions
Topic: 20x NeoSPlan ULWD objective quality
Replies: 10
Views: 324

Re: 20x NeoSPlan ULWD objective quality

The 20X I use for macro is the Oly LMPlanFl 20/0.40 UIS (modern infinite for no cover glass, 12mm WD) With a 200mm tube lens it works very well on APSC. I don't think that it would cover FF nor match the performance of the Mitty but if you can find it at a reasonable price like I did I think that it...
by Pau
Thu Aug 25, 2022 4:28 am
Forum: Equipment Discussions
Topic: knobs for 2 mm square shaft
Replies: 12
Views: 575

Re: knobs for 2 mm square shaft

Why not try a potentiometer knob, one with a decent set screw? They're for a 6 mm shaft with a flat where the set screw pinches. It might not be elegant, but I suspect it would fit fine, maybe with a longer set screw? Good idea, although maybe in place of a potentiometer knob also a shaft coupler w...
by Pau
Wed Aug 17, 2022 2:30 am
Forum: Photography Through the Microscope
Topic: Some diatoms and a question
Replies: 24
Views: 1139

Re: Some diatoms and a question

... However it’s definitely not parfocal with the eyepiece either. Did you try the approaches I suggested? Clear pictures of your microscope, in particular of the phototube, camera coupling and eyepiece tubes would be useful to provide more specific advice. An easy test is to put one eyepiece at th...
by Pau
Wed Aug 17, 2022 2:21 am
Forum: Photography Through the Microscope
Topic: Some diatoms and a question
Replies: 24
Views: 1139

Re: Some diatoms and a question

... I presume you are taking short exposures < 1/60 ? The shorter the better, obviously. Not so obvious, in general this is true for hand held photography but if the subject is motion less (like a typical prepared slide) and you haven't environmental vibrations often long exposures can minimize cam...
by Pau
Tue Aug 16, 2022 1:54 am
Forum: Photography Through the Microscope
Topic: Collotheca Sp. radiating cilia
Replies: 3
Views: 258

Re: Collotheca Sp. radiating cilia

Nice images of interesting critters, although you have something wrong with the measurements: nm means nanometer and they would be invisible with optical microscopy, maybe you meant micrometer μm ?
by Pau
Sat Aug 13, 2022 12:45 am
Forum: Photography Through the Microscope
Topic: Can you help me identify this ciliate?
Replies: 4
Views: 229

Re: Can you help me identify this ciliate?

Could it be Frontonia with a fagocited long cyanobacteria filament occupying its periphery? Take a look at the Ehrenberg's original image of Frontonia leuca at http://www.infusoria.org/?page_id=401 http://www.infusoria.org/wp-content/uploads/2015/05/34-8-2-Frontonia-leucas-originally-Bursaria-leucas...
by Pau
Fri Aug 12, 2022 8:47 am
Forum: Photography Through the Microscope
Topic: A Choanoflagellate and Lacrymaria
Replies: 21
Views: 1412

Re: A Choanoflagellate and Lacrymaria

One thing I have wondered about in relation to the last 2 comments. If you set up Kohler illumination carefully with the lamp filament in focus but then put a diffuser in the light path to produce a more uniform field of illumination, what difference does it make to be sure that the lamp filament i...
by Pau
Thu Aug 11, 2022 3:41 am
Forum: Photography Through the Microscope
Topic: A Choanoflagellate and Lacrymaria
Replies: 21
Views: 1412

Re: A Choanoflagellate and Lacrymaria

Thanks again for the further info, I still can't find the last figures document online but it has pointed me to the patent documents where it seems better explained https://patents.google.com/patent/US6507434B2/en with one fly-eye lens and one diffuser and https://patents.google.com/patent/US2003022...
by Pau
Wed Aug 10, 2022 4:09 am
Forum: Photography Through the Microscope
Topic: A Choanoflagellate and Lacrymaria
Replies: 21
Views: 1412

Re: A Choanoflagellate and Lacrymaria

David, thanks for the follow-up. In base on your observations I tend to think that the fly eye lens is acting as the light source for Köhler in place of the lamp filament or LED, as this would explain its tolerance to the lamp position and could explain its function of providing even illumination no...