Search found 128 matches

by Joseph S. Wisniewski
Sun Apr 07, 2013 2:59 pm
Forum: Equipment Exchange
Topic: ENDED Nikon CFI equipment wanted
Replies: 4
Views: 1569

I'd just like to add that I've dealt with the dealer Rogelio linked to before. I'm one of the 130 positive feedbacks. :D
by Joseph S. Wisniewski
Tue Mar 19, 2013 3:08 pm
Forum: Equipment Discussions
Topic: Anyone used a Nikon LWD 40x 0.55 Ph2 DL?
Replies: 6
Views: 1448

It's a 25mm mount, aka M25. Don't get an M27 (Nikon BD) adapter by mistake. Search for "Nikon M25" and you'll find several adapters, typically to 52mm filter threads, then get step-down rings to your lens size. Diffraction will be a little worse than you anticipate, because it's a "phase contrast" o...
by Joseph S. Wisniewski
Tue Mar 12, 2013 2:16 pm
Forum: Equipment Discussions
Topic: DIY macro rig uses P&S camera, 50mm add-on lens
Replies: 8
Views: 1929

You can buy a threaded adapter for this and many other compacts, perhaps he has a reason for not using one. A good rason. A 50mm f1.4 will tear the zoom mechanism in the average point and shoot to pieces. I've rigged setups like this twice. Once was with a filter mounting system that had a plate wi...
by Joseph S. Wisniewski
Sun Feb 24, 2013 11:54 am
Forum: Equipment Discussions
Topic: Nikon D7100
Replies: 8
Views: 2120

There are currently a number of discussions appearing on the internet with reference to the video capabilities of the D5200 and D7100; from those discussions I pulled the following quotes: In reference to the D7100 The other big change is that the camera dispenses with the anti-aliasing filter alto...
by Joseph S. Wisniewski
Sun Feb 24, 2013 11:34 am
Forum: Equipment Discussions
Topic: Nikon D7100
Replies: 8
Views: 2120

I'm in essay mode today... A long, long time ago, most digital cameras had a plain old piece of glass as the "window" on the sensor package. In front of that, was an independent four layer filter pack, 1) a blue-green (Schott BG-34 or similar) absorption filter 2) a LiNbO3 birefringent plate (think ...
by Joseph S. Wisniewski
Sun Feb 24, 2013 10:55 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: False color and detail/DOF from shiny metal
Replies: 90
Views: 41449

First, it's not a "Bayer effect". I started my macro work using a pre-Bayer technique called "flim" (or maybe ”FLIM", I can't remember if it was an acronym for something). Flim was really weird stuff, it made an image based on the random placement of little metal particles, and you had to do weird s...
by Joseph S. Wisniewski
Sun Feb 24, 2013 10:24 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Image quality of Photar 1:2.5/25 lens
Replies: 22
Views: 8065

Patrick, agreed, there's definitely plenty of longitudinal CA in those later examples, in the largest bright highlights. You can see the reddish borders in the areas in front of the plane of focus, and greenish ones brhind the plane of focus. That agrees with my experience with both the 25/2.5 and 5...
by Joseph S. Wisniewski
Wed Feb 13, 2013 12:18 pm
Forum: Equipment Discussions
Topic: Metz mecablitz 15 MS-1 digital Macro
Replies: 26
Views: 6943

I can only guess from the Metz web site as source of information. I believe this is, basically, an ordinary ring flash equipped with two independent semicircular tubes and with a small sector of each tube backed by an adjustable reflector and covered by a less diffusing window that the rest of the ...
by Joseph S. Wisniewski
Tue Feb 12, 2013 1:18 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Why recommend polarizer, 1/4 wave plate for Mitutoyo 1x,2x?
Replies: 8
Views: 3263

I think you're misreading slightly. I'm guessing that, for normal photography or observation, they are not recommending that you use either a 1/4 wave retarder or a polarizer. I think what they're trying to say is that, when you need linear polarization, you should use this particular polarizer behi...
by Joseph S. Wisniewski
Thu Jan 03, 2013 1:44 pm
Forum: Equipment Discussions
Topic: Longer OR shorter lens...smaller max aperture
Replies: 9
Views: 1242

You're quite welcome, Ray.
by Joseph S. Wisniewski
Thu Jan 03, 2013 12:36 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: How to record the XY position of slide
Replies: 9
Views: 2861

Saw a Nikon biological stage fitted with encoders on the bay of e. http://www.ebay.com/itm/Microscope-stage-with-BOECKELER-ENCODERS-for-Nikon-OPTIPHOT-LABOPHOT-BH2-BH-2-/251207361793?pt=LH_DefaultDomain_0&hash=item3a7d202501 I wouldn't go near unknown encoders without matching decodes, I'm just post...
by Joseph S. Wisniewski
Mon Dec 31, 2012 12:24 pm
Forum: Equipment Discussions
Topic: Adapter for Nikon objective to Nikon body /bellows.
Replies: 17
Views: 3530

Sorry to read that you've already bought the BD plan. Normally, I advise beginners to avoid those, and stick with regular M plan 210mm objectives. To all intents and purposes, the BD plan are just the M plan wrapped in a larger barrel for the "dark field" illumination system. That's like a "ring lig...
by Joseph S. Wisniewski
Mon Dec 31, 2012 11:42 am
Forum: Equipment Discussions
Topic: Longer OR shorter lens...smaller max aperture
Replies: 9
Views: 1242

Simple explanation when you're talking about 35mm SLR lenses. SLRs have a swinging mirror. Together with the shutter, this means that the rear element has to be at least 38mm from the plane of focus. That distance, the "back focus" drives normal and wide angle lens designs. Using 1950 or 1960 lens d...
by Joseph S. Wisniewski
Sun Dec 30, 2012 3:09 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: How to record the XY position of slide
Replies: 9
Views: 2861

I do exactly what Rik suggests, micced a slide, got the corner coordinates of it with both stages, and viola. They really do make the readout units that Dave suggested, if you need more precision. They have them for both inspection and plain old biological scopes. I see them all the time on the bay ...
by Joseph S. Wisniewski
Fri Dec 28, 2012 10:02 am
Forum: Equipment Discussions
Topic: objective and ocular on a bellows?
Replies: 2
Views: 1070

Several reasons why we don't use a bellows that way... First, pretty much no matter what you bolt it to, a bellows is not stable enough for 100x, let alone 400x. There's a reason scope stands are built like giant c-clamps, with the upright part is a couple of inches of cast aluminum, and the stage b...