Search found 774 matches

by Scarodactyl
Fri Apr 17, 2020 8:11 pm
Forum: Microscopes and optics
Topic: LOMO as a brand
Replies: 25
Views: 1063

Re: LOMO as a brand

Thank you for sharing that! I have been curious about Lomo for a while, but not curious enough to buy on (aside from the aforementioned excellent 3.7x objective). I was searching for something else (an urban legend about a model of microscope that was exported from the soviet union solely for the sc...
by Scarodactyl
Fri Apr 17, 2020 8:04 pm
Forum: Microscopes and optics
Topic: PLANAPO eyepieces
Replies: 7
Views: 404

Re: PLANAPO eyepieces

It depends on the era. Nikon was ahead of the curve--in the labophot era they introduced the "CF" series objectives, with all corrections done internally, requiring no eyepiece corrections. This carried over to their infinity-corrected CFI series. If you have an older one it will need eyepiece corre...
by Scarodactyl
Fri Apr 17, 2020 8:39 am
Forum: Pictures and Videos
Topic: First shots with DSLR, first shots stacking
Replies: 7
Views: 371

Re: First shots with DSLR, first shots stacking

I think what you have been sold as a dslr adapter is actually a reducing adapter designed for a c mount camera with a further c-mount to eos adapter screwed on (and the price more than tripled.) If so this adapter is meant for a camera with a small sensor and with a small flange focal distance (dist...
by Scarodactyl
Fri Apr 17, 2020 8:24 am
Forum: Camera systems and imaging
Topic: What DSLR settings do you use?
Replies: 5
Views: 441

Re: What DSLR settings do you use?

That is an odd adapter to be using. Typically a reducing adapter is used to smush the image back down to small enough for a tiny sensor c mount camera (a 1/2" typically with a .5x lens), not for a dslr with an aps-c camera. Does it give you a lot of vignetting? As to settings, on my t6 I have it kn ...
by Scarodactyl
Thu Apr 16, 2020 10:31 pm
Forum: Microscopes and optics
Topic: Anyone familiar with a Steindorff Microscope?
Replies: 5
Views: 283

Re: Anyone familiar with a Steindorff Microscope?

Ah, but they did make the Microbe Hunter

Image
One heck of a nice-looking scope, optics aside.
by Scarodactyl
Thu Apr 16, 2020 10:03 pm
Forum: Beginner's corner
Topic: PLAN APO vs APO
Replies: 8
Views: 526

Re: PLAN APO vs APO

It's not super common to find modern non-plan apo objectives. There are modern stereos that are just labeled just 'apo' so planarity might not be a guarantee, but these were greenough units (leica and zeiss) so perfect planarity might jot be expected anyway, that's not what you'd want it for. For a ...
by Scarodactyl
Thu Apr 16, 2020 6:21 pm
Forum: Microscopes and optics
Topic: Anyone familiar with a Steindorff Microscope?
Replies: 5
Views: 283

Re: Anyone familiar with a Steindorff Microscope?

I'd guess a Chinese-made scope broadly modeled on an Olynpus BH2. Steindorff was once a serious brand a long time back. It looks like the name has also been used to sell the same Chinese scopes you'll see for sale from any smalltime dealer. Qualitywise it's probably just ok, not a toy but inferior o...
by Scarodactyl
Thu Apr 16, 2020 5:56 pm
Forum: Beginner's corner
Topic: Numerical Aperature 40x
Replies: 3
Views: 330

Re: Numerical Aperature 40x

Of course when you get into industrial dry long working distance objectives you can spend an awful lot for a very thoroughly engineered objective with a much lower NA. But you are unlikely to end up with one of these without knowing what you're getting and exactly what you want to use it for.
by Scarodactyl
Thu Apr 16, 2020 5:31 am
Forum: Microscopes and optics
Topic: LOMO as a brand
Replies: 25
Views: 1063

Re: LOMO as a brand

Their reputation varies a lot depending on who you ask. Built like tanks? Prone to breaking? Good optics? Bad optics? There's a range of reactions and likely a range of quality levels. It also suggests to me that QC might not have been the best. They made (make?) a 3.7x objective that is very well-l...
by Scarodactyl
Wed Apr 15, 2020 9:53 pm
Forum: My microscope
Topic: The Myth of the Digital Microscope
Replies: 10
Views: 633

Re: The Myth of the Digital Microscope

It's certainly not an honest or useful way to present magnification.
by Scarodactyl
Wed Apr 15, 2020 8:37 pm
Forum: Illumination Techniques
Topic: Soviet Plot revealed !!
Replies: 25
Views: 982

Re: Soviet Plot revealed !!

I wonder if this might be an instance of someone copying a design without fully understanding it.
by Scarodactyl
Wed Apr 15, 2020 6:50 pm
Forum: My microscope
Topic: The Myth of the Digital Microscope
Replies: 10
Views: 633

Re: The Myth of the Digital Microscope

There are a wide range of digital scopes available, ranging from 10-20 bucks to 10-20k+ bucks. But they do tend to aim somewhat low on resolution--even something like the Leica DVM6 only has a 10mp camera integrated, so it's hard to imagine some corners aren't cut since you can't get more than that ...
by Scarodactyl
Wed Apr 15, 2020 5:10 am
Forum: Microscopes and optics
Topic: Leitz Orthoplan trinocular: stuck inter-ocular adjustment
Replies: 12
Views: 475

Re: Leitz Orthoplan trinocular: stuck inter-ocular adjustment

There's also something extra special about using a scope that you have yourself assembled or fixed.
by Scarodactyl
Tue Apr 14, 2020 6:49 am
Forum: Illumination Techniques
Topic: Epi DIC woes
Replies: 31
Views: 939

Re: Epi DIC woes

I'm using the diamond because the nice angular crystal faces make the doubling particularly obvious (it is also nice to be constantly reminded why I'm doing this, vs the less diluted frustration of looking at doubled dust specks on glass). Diamond really shouldn't have any properties that would affe...
by Scarodactyl
Tue Apr 14, 2020 3:53 am
Forum: Illumination Techniques
Topic: Epi DIC woes
Replies: 31
Views: 939

Re: Epi DIC woes

I just had another look, and the weird thing is I am pretty sure I'm getting a real DIC effect with the undoubled image with the polarizer reversed--it's definitely different from crossed polars in brightfield (which with the quarter wave plate basically give you all one color on specular reflection...
by Scarodactyl
Tue Apr 14, 2020 3:20 am
Forum: Illumination Techniques
Topic: Epi DIC woes
Replies: 31
Views: 939

Re: Epi DIC woes

I figured it must have a quarter wave plate attached (pretty much the only way to make this thing directional), but it's unclear to me why it'd be designed that way (the only quarter wave plate in a typical DIC diagram is the separate slider), or why exactly it's interacting with things this way. Of...
by Scarodactyl
Tue Apr 14, 2020 2:46 am
Forum: Illumination Techniques
Topic: Epi DIC woes
Replies: 31
Views: 939

Re: Epi DIC woes

The plot thickens. One thing I noticed and thought was odd in the manual was the mention that for DIC the polarizer should be inserted so that the 'NIC' label is facing forward, and for polarization it should be flipped so that the "PO" label is facing forward. I did have it set with the NIC label f...
by Scarodactyl
Tue Apr 14, 2020 1:33 am
Forum: Illumination Techniques
Topic: Epi DIC woes
Replies: 31
Views: 939

Re: Epi DIC woes

Everything is OEM. It's in surprisingly immaculate condition, even though it was shipped in somewhat inadequate packaging--all that's wrong is a missing magnetic side cover which doesn't seem to affect the image at all (covering or uncovering does not have any visible effect). I should have mentione...
by Scarodactyl
Mon Apr 13, 2020 9:38 pm
Forum: Illumination Techniques
Topic: Epi DIC woes
Replies: 31
Views: 939

Re: Epi DIC woes

I spent some time looking for other examples of Olympus epi DIC images, and found this older thread http://www.microbehunter.com/microscopy-forum/viewtopic.php?t=4501 Some of his images show the same doubling, particularly the full image of the number 2. I am not sure if other subject don't show it,...
by Scarodactyl
Mon Apr 13, 2020 8:54 pm
Forum: Illumination Techniques
Topic: Epi DIC woes
Replies: 31
Views: 939

Re: Epi DIC woes

Yes, these are the exact prisms for these objectives. They also made separate prisms for thr ulwd objectives of this series but they are marked ulwd. I centered the bulb but it had no effect. I am pretty sure I did it right but the filament was quite large in thr FoV with my phase telescope. Either ...
by Scarodactyl
Mon Apr 13, 2020 5:50 pm
Forum: Camera systems and imaging
Topic: Top Tier vs Mid Range DSLR Cameras
Replies: 7
Views: 519

Re: Top Tier vs Mid Range DSLR Cameras

Just as a sidenote, the pe projectives are not compensating. Olympus infinity objectives are entirely corrected in-objective (aside from the infinity metallurgical objectives from the BH2 era which use the same corrections as oyhers in the series).
by Scarodactyl
Mon Apr 13, 2020 3:46 pm
Forum: Camera systems and imaging
Topic: Olympus Photomicro Adapter L Cheaper Substitute
Replies: 3
Views: 386

Re: Olympus Photomicro Adapter L Cheaper Substitute

Once it connected a controller that would operate the shutter. Now it plugs the hole so light won't get in.
by Scarodactyl
Mon Apr 13, 2020 8:18 am
Forum: Illumination Techniques
Topic: Epi DIC woes
Replies: 31
Views: 939

Re: Epi DIC woes

Thanks--I did have a look through it earlier, but I looked again now and the one thing I have not done is center the halogen bulb (I have a 100w halogen lamp which isn't mentioned in the manual [I did triple check to be sure it wasn't somehow a mercury lamp even though it's labeled hal]). I will try...
by Scarodactyl
Mon Apr 13, 2020 6:30 am
Forum: Camera systems and imaging
Topic: Olympus Photomicro Adapter L Cheaper Substitute
Replies: 3
Views: 386

Olympus Photomicro Adapter L Cheaper Substitute

I previously wrote up a solution for this which involves a segment of pvc pipe and a 38mm to m42 adapter, but this one is actually cheaper and looks less like a length of PVC pipe with a 38mm to m42 adapter. The Olympus Photomicro L is a beautiful adapter which grabs onto the 38mm dovetail of an Oly...
by Scarodactyl
Mon Apr 13, 2020 6:21 am
Forum: Illumination Techniques
Topic: Epi DIC woes
Replies: 31
Views: 939

Epi DIC woes

As I mentioned over in the my microscope section I recently acquired an Olympus BH2 with epi DIC capabilities. I have been enjoying it a lot, and the DIC effect is great, except for one persistent issue: I get a weak doubling effect on the image when the DIC prism is inserted. It's not bad for viewi...
by Scarodactyl
Sun Apr 12, 2020 8:39 pm
Forum: Camera systems and imaging
Topic: Top Tier vs Mid Range DSLR Cameras
Replies: 7
Views: 519

Re: Top Tier vs Mid Range DSLR Cameras

LMscope is a good place to start but I don't think they're all that rigorous, and I wouldn't necessarily take their ratings as extremely accurate. Better to use it as a reference while looking out for the specs that matter most for your work. A lot of features that make a camera nicer for normal usa...
by Scarodactyl
Sun Apr 12, 2020 7:39 pm
Forum: For forum members who want to buy and sell equipment
Topic: Zeiss Microscope part
Replies: 2
Views: 354

Re: Zeiss Microscope part

You might not want to sell this--isn't that the fine focus mechanism on it? It may be that the bosepiece can ne separated from the focus so you can hook something else on there.
by Scarodactyl
Sun Apr 12, 2020 4:30 pm
Forum: Microscopes and optics
Topic: Zeiss Standard Microscope and Mirror Woes
Replies: 6
Views: 503

Re: Zeiss Standard Microscope and Mirror Woes

Looks worth a try! That said fsms can often be had on eBay or similar in a variety of dimensions for reasonable prices.
by Scarodactyl
Fri Apr 10, 2020 11:35 pm
Forum: Microscopes and optics
Topic: Leica Stereozoom 6: dirty lens
Replies: 11
Views: 802

Re: Leica Stereozoom 6: dirty lens

Copy in a broad sense (I have heard the heads are compativle for instance) but apparently not an exact clone.
by Scarodactyl
Fri Apr 10, 2020 3:57 pm
Forum: For forum members who want to buy and sell equipment
Topic: MANY Objective lenses available for sale - Barn Find
Replies: 13
Views: 929

Re: MANY Objective lenses available for sale - Barn Find

I guess you must not ship to the US. eBay won't even show me your items.