Search found 253 matches

by wporter
Sat Feb 16, 2019 2:55 am
Forum: Illumination Techniques
Topic: Epi DIC of an integrated circuit
Replies: 12
Views: 3024

Epi DIC of an integrated circuit

For your viewing pleasure, a short video I made showing a DiatomShop.com bare IC under reflected-light DIC. The various colors were cycled through, to show the differences in textures and looks of the traces at different levels of the upper prism insertion. The technique was used to help troubleshoo...
by wporter
Thu Feb 14, 2019 6:52 pm
Forum: Pictures and Videos
Topic: Bacteria from an old sausage
Replies: 6
Views: 1432

Re: Bacteria from an old sausage

We make between 500 and 1000 lbs. of mini pepperoni
How do I get my hands on some? Do you export to the US?
by wporter
Mon Jan 28, 2019 3:44 pm
Forum: Microscopes and optics
Topic: Unitron Phase MPH Microscope
Replies: 4
Views: 1248

Re: Unitron Phase MPH Microscope

No, but here's a skimpy brochure on their phase models:

http://www.science-info.net/docs/unitro ... Models.pdf
by wporter
Fri Jan 18, 2019 1:06 am
Forum: Illumination Techniques
Topic: Dan M. Stump : Thesis [from 1921]
Replies: 3
Views: 1900

Re: Dan M. Stump : Thesis [from 1921]

Fascinating paper! Thanks for posting this. Lots of info for experimentation here.
by wporter
Tue Jan 15, 2019 4:38 pm
Forum: Pictures and Videos
Topic: Amoeba
Replies: 7
Views: 1079

Re: Amoeba

Great video, nicely recorded.
by wporter
Fri Jan 11, 2019 8:51 pm
Forum: Home-made microscope adaptations
Topic: Fine Focal Adjustment Device.
Replies: 16
Views: 4019

Re: Fine Focal Adjustment Device.

Is there an aftermarket device (or home engineered one) that extends the radius of the fine focus knob for very fine increments of the focal plane? There certainly is. Between 'stiction' and the small size of the knob, it is sometimes desirable to have an aid in incrementing the knob, as for focus ...
by wporter
Tue Jan 08, 2019 6:12 pm
Forum: Miscellaneous
Topic: New Microscope shows crazy detials
Replies: 4
Views: 2890

Re: New Microscope shows crazy detials

improved electron microscope resolution Screenshot_2019-01-08_10-07-17.png
improved electron microscope resolution Screenshot_2019-01-08_10-07-17.png (209.16 KiB) Viewed 2787 times
Word of the day:

ptychography


A good image from 19 July 2018 Nature (synopsis here: https://www.nature.com/articles/d41586-018-05711-y)
by wporter
Sat Jan 05, 2019 5:17 pm
Forum: Beginner's corner
Topic: Where would one find an XY stage for a stereoscope microscope?
Replies: 4
Views: 1540

Re: Where would one find an XY stage for a stereoscope microscope?

Search "x-y stage" in ebay; most are either regular compound microscope stage slide holders or x-y stages for precision non-microscope gear, but you can find items like this, which may work: https://www.ebay.com/itm/Microscope-X-Y-Measuring-Working-Stage-w-Clips-Specimen-Holder-Scale-Adjustable/2734...
by wporter
Fri Jan 04, 2019 3:49 pm
Forum: Miscellaneous
Topic: Image of Kemp 8 Test Form
Replies: 6
Views: 2342

Re: Image of Kemp 8 Test Form

Brilliant; thanks very much, highly useful!
by wporter
Tue Jan 01, 2019 12:16 am
Forum: Beginner's corner
Topic: Elements fluorescing different colors under dried water droplet?
Replies: 4
Views: 1108

Re: Elements fluorescing different colors under dried water droplet?

I am sure something like this has been attempted in microscopy not sure about the efficacy. https://digital-photography-school.com/ ... otography/ Maybe you're thinking of infrared microspectroscopy , used in chemistry; the variation in IR reflection (absorption) of a substance when exposed to IR w...
by wporter
Mon Dec 31, 2018 1:15 am
Forum: Beginner's corner
Topic: Where do they come from?
Replies: 4
Views: 1279

Re: Where do they come from?

They form spores and cysts when a water body dries up, and get reconstituted when conditions improve (i.e., they get immersed in water). Soil holds the cysts etc., so they are all around us. Birds, wind, and insects can transport them between bodies of water, also.
by wporter
Sun Dec 30, 2018 9:26 pm
Forum: For forum members who want to buy and sell equipment
Topic: Looking for parts for Microstar IV
Replies: 17
Views: 2627

Re: Looking for parts for Microstar IV

nicely made part , Bill. Looks permanent. Thanks very much, Phil. As far as being permanent, it probably depends mostly on the durability of the RTV over time, exposed to the UV from the lamp (temperature not being a problem); worst case, the filter falls out after a year or two. If it does, just r...
by wporter
Sat Dec 29, 2018 9:52 pm
Forum: For forum members who want to buy and sell equipment
Topic: Looking for parts for Microstar IV
Replies: 17
Views: 2627

Re: Looking for parts for Microstar IV

Thank you for the compliments, Hobbyst. If it helps someone restore this function in their Microstar 4, well worth it. Though you can fix things a bit with white-balance adjustments, etc., better to fix things at the source. Plus it's really annoying to have a disfunctional knob on one's microscope....
by wporter
Sat Dec 29, 2018 8:09 pm
Forum: For forum members who want to buy and sell equipment
Topic: Looking for parts for Microstar IV
Replies: 17
Views: 2627

Re: Looking for parts for Microstar IV

The simple new holder is made from a piece of scrap 6061 aluminum. The only slightly 'critical' dimensions are 1 through 5: 1. The large hole; it is 0.253" (6.48mm), for a slip-fit over the existing pivot bushing (which has an O.D. of 0.250"). 2. The small hole; it is 1/8" (3.16mm), for a press-fit ...
by wporter
Sat Dec 29, 2018 4:02 pm
Forum: For forum members who want to buy and sell equipment
Topic: Looking for parts for Microstar IV
Replies: 17
Views: 2627

Re: Looking for parts for Microstar IV

Here is a substitute holder I made for one of my broken ones. Works great. Longer post coming after I get a chance to draw it up.
by wporter
Thu Dec 27, 2018 12:56 am
Forum: For forum members who want to buy and sell equipment
Topic: Looking for parts for Microstar IV
Replies: 17
Views: 2627

Re: Looking for parts for Microstar IV

Why not make it a little bigger, so it can take some more easily found size, small filter disc Apo, that's the plan. It's almost a case of making the hole to hold a 32mm filter (if that will work in the microscope) and letting the user mount his own filter in the hole with some hi-temp engine gaske...
by wporter
Thu Dec 27, 2018 12:43 am
Forum: Pictures and Videos
Topic: Honey Bee eye
Replies: 2
Views: 781

Re: Honey Bee eye

they are little friends, a totally stupid and sentimental approach Not at all; emotional appreciation is a useful thing; it's what keeps us from strangling our kids when they misbehave! It can also be a good replacement for rationality when all the facts are not complete or making much of an impres...
by wporter
Wed Dec 26, 2018 11:36 pm
Forum: For forum members who want to buy and sell equipment
Topic: Looking for parts for Microstar IV
Replies: 17
Views: 2627

Re: Looking for parts for Microstar IV

Most of the Microstar 4s I've worked on are missing the blue filter and the filter's holder. Those are a couple of rare items. The filter holder is a good design but made of a horrible material, and over time breaks into pieces of fried plastic, so you really don't want to replace it with a new iden...
by wporter
Mon Dec 24, 2018 8:36 pm
Forum: Specimens, samples and slides
Topic: Christmas Tree Hand-Sections
Replies: 6
Views: 2000

Re: Christmas Tree Hand-Sections

Excellent demonstration, mrsonchus, thank you; and very timely, too! Happy Holidays!

What are those snow-coat slides? Are they coated?

I think that the tree is a fir of some kind.
by wporter
Sun Dec 23, 2018 6:03 pm
Forum: About the website, the magazine and this forum
Topic: Image from Google Photos?
Replies: 8
Views: 4879

Re: Image from Google Photos?

The forum likes smaller image files. Try using an image resizing program to make the final image file size smaller, on the order of 100kB.

(For Linux users, I recommend Simple Image Reducer)
by wporter
Fri Dec 21, 2018 9:28 pm
Forum: Resources (online, books etc.)
Topic: Early Photographs of Test Diatoms
Replies: 19
Views: 3537

Re: Early Photographs of Test Diatoms

Yes! The hat-trick, via a 'card screen', p.270-271.

These two old books are fantastic. Thanks to MichaelG, MicroBob, and desertrat, who brought them to our collective attention.
by wporter
Fri Dec 21, 2018 8:09 pm
Forum: Resources (online, books etc.)
Topic: Early Photographs of Test Diatoms
Replies: 19
Views: 3537

Re: Early Photographs of Test Diatoms

@ImperatorRex - thanks for clarifying. So they managed to keep the photographic setup totally motionless and vibration-less for 10 minutes...we are standing on the shoulders of giants, no doubt. Actually, a bit of movement at the beginning & end of a 10-minute exposure might have a lot less blurrin...
by wporter
Fri Dec 21, 2018 5:03 pm
Forum: Microscopy accessories
Topic: Antique slide-ring table
Replies: 2
Views: 1920

Antique slide-ring table

Nice old slide-ringing table, what a great design:

https://www.ebay.com/itm/Antique-Micros ... k:156:pf:0

Too bad the seller knows what it is (and the price reflects that!)
by wporter
Sat Dec 15, 2018 11:24 pm
Forum: Collecting microscopes and slides
Topic: Recommend grease?
Replies: 41
Views: 11691

Re: Recommend grease?

But as I rotate the 5 place turret the ball race grinds as the balls mysteriously slip out only after a few rotations? Sounds like something else is wrong. The balls are in many cases retained from moving out of place by a brass ring with bearing sized holes in it; if it doesn't have one of those, ...
by wporter
Fri Dec 14, 2018 11:35 pm
Forum: Collecting microscopes and slides
Topic: Recommend grease?
Replies: 41
Views: 11691

Re: Recommend grease?

Well I have bought many types of the so-called helicoid grease and sad to report NON have the properties of the OEM zeiss grease Some of this below echos others: I occasionally use a helicoid grease some places on microscopes, but not often. It is Helimax-XP ("optical and Instr. helicoid grease w/ ...
by wporter
Sat Dec 08, 2018 9:26 pm
Forum: Off Topic
Topic: Anyone see their microscope 'in the movies'?
Replies: 6
Views: 3096

Re: Anyone see their microscope 'in the movies'?

And then there is the exotic Steindorff Microbe Hunter microscope, featured in the movie "Dr. Holl": http://www.microscopy-uk.org.uk/mag/artdec08/mm-mdc-steindorff.html No, I don't have one. I wish I did, what a beauty; Art Deco, maybe? One can often see microscopes in popular TV shows, particularly...
by wporter
Thu Dec 06, 2018 3:58 pm
Forum: Microscopy accessories
Topic: $30 mystery condenser
Replies: 16
Views: 4047

Re: $30 mystery condenser

For those interested in diy'ing a whole range of other contrast systems ; all kinds of masks, one of those with a group of the annuli housings might be ideal, because each one comes with a set of centering screws, especially ideal for those making the difficult to center DF stops. That's a good ide...
by wporter
Thu Dec 06, 2018 1:29 am
Forum: Microscopy accessories
Topic: $30 mystery condenser
Replies: 16
Views: 4047

Re: $30 mystery condenser

It's part of a phase condenser system, like this one: https://www.ebay.com/itm/Phase-Contrast-Set-for-Compound-Microscope-w-Three-Condensers-Three-Objectives/121365841453?hash=item1c41f7c62d:g:-aUAAOSwP7NbiXIx:rk:14:pf:0 The darkfield effect is apparently just from the stop effect of the condenser p...
by wporter
Wed Dec 05, 2018 5:55 pm
Forum: Pictures and Videos
Topic: Hoffman Modulation Contrast
Replies: 14
Views: 1708

Re: Hoffman Modulation Contrast

Hoffman is especially best for use with plastic petri dishes; since crossed polarizers (i.e., a polarizer and an analyzer) are not used, as they are in DIC, there is no colored strain-patterning in the field, as there would be if DIC was used with plastic dishes. The resolution is not as good as DIC...