Search found 54 matches

by Ancient1
Fri May 02, 2014 11:29 am
Forum: Equipment Discussions
Topic: Circular polarizing filter CW vs CCW?
Replies: 8
Views: 1587

Sorry Rik, it was intended to be tongue in cheek... I probably should have added a confused smiley after it.
by Ancient1
Fri May 02, 2014 10:39 am
Forum: Equipment Discussions
Topic: Circular polarizing filter CW vs CCW?
Replies: 8
Views: 1587

Could it be as simple as which side you look through?
by Ancient1
Thu Apr 24, 2014 8:48 am
Forum: Equipment Discussions
Topic: New Lytro DSLR
Replies: 3
Views: 1021

I agree that this is not a developed or mature technology and calling it a professional model is far from truth. But, it will be interesting to see how this technology develops over time. I find it interesting that it uses a fixed f2 lens and a relatively small sensor of 7.5-10.5mm. Quoting the reso...
by Ancient1
Wed Apr 23, 2014 10:25 am
Forum: Equipment Discussions
Topic: New Lytro DSLR
Replies: 3
Views: 1021

New Lytro DSLR

"Objects held nearly flush with the lens appeared perfectly in focus — and yet still let you refocus on other objects across the room."

https://www.yahoo.com/tech/lytro-brings ... 57720.html
by Ancient1
Thu Apr 03, 2014 4:18 pm
Forum: Equipment Discussions
Topic: Olympus announces pocket camera with focus stacking
Replies: 4
Views: 1398

The TG-3 may not be a panacea. "The new Focus Stacking function captures eight different shots continuously, while shifting the focus from the foreground to the background. It extracts and merges only those areas of each image that are in focus and produces a single photo with a focus that spans sev...
by Ancient1
Tue Nov 12, 2013 6:54 pm
Forum: Equipment Discussions
Topic: Canon EOS problem
Replies: 6
Views: 1440

Be careful using an eraser to clean contacts, as it removes the very thin gold plating. Contact cleaner is a safer choice.
by Ancient1
Tue Sep 03, 2013 8:51 am
Forum: Equipment Discussions
Topic: Affordable automated rotation stage? Any ideas?
Replies: 11
Views: 2272

How much load does the device have to carry?
by Ancient1
Wed Aug 21, 2013 8:14 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Stacking in the News
Replies: 3
Views: 1965

Stacking in the News

I was pleased to see that our craft had hit the news this morning.

http://news.yahoo.com/photos/bugging-ou ... slideshow/
by Ancient1
Thu Aug 15, 2013 12:10 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Dynamic range of DLSR
Replies: 2
Views: 1097

While the Canon 5D Mkii can digitize to 14 bits, the dynamic range is given at around 11.7 EV, or 70.2 db. This is because dynamic range is actually limited by sensor noise. A Google search for Canon 5D will bring up many articles regarding dynamic range.
by Ancient1
Thu Aug 15, 2013 8:27 am
Forum: Equipment Discussions
Topic: cheap webcam for use with microscope +laptop?
Replies: 5
Views: 1799

Easily done, low cost way to get started. http://micro.sci-toys.com/eyepiece_photography
by Ancient1
Tue Mar 19, 2013 1:16 pm
Forum: Equipment Discussions
Topic: MTF diffraction limit formula
Replies: 15
Views: 6428

The full download of "Practical Optical System Layout / And Use of Stock Lenses", by Warren J. Smith (McGraw-Hill 1997) can be found here.
http://ebookbrowse.com/practical-optica ... d132673438
by Ancient1
Thu Mar 14, 2013 8:26 am
Forum: Equipment Discussions
Topic: How To Connect CCTV To Computer Monitor?
Replies: 37
Views: 10311

This will allow viewing and capture on a PC.

http://www.directron.com/impactvcb.html?gsear=1
by Ancient1
Sun Feb 17, 2013 6:37 pm
Forum: Equipment Discussions
Topic: Need help for taking photo with Leica Stereozoom 6 photo
Replies: 10
Views: 5701

Just a few days ago, this post described a home made adapter for a SZ7. The concept would be the same for your scope, with minor differences at the scope end.
http://www.photomacrography.net/forum/v ... hp?t=19485
by Ancient1
Mon Feb 11, 2013 5:52 pm
Forum: Equipment Discussions
Topic: Found an old enlarger lens, any good?
Replies: 18
Views: 3669

Steve,

A small dab of flat black on a lens (or mirror) flaw will prevent dispersion. I have used this technique many times and it always worked well for me.

Gene
by Ancient1
Mon Oct 29, 2012 6:59 pm
Forum: Equipment Discussions
Topic: Harvard Flat Lens Technology
Replies: 1
Views: 755

In the article, distortions, astigmatism and coma are stated as not being present in the flat lens design. Note that there is no mention of chromatic aberration. Also, note the statement “Operating at telecom wavelengths (i.e., the range commonly used in fiber-optic communications), the new device i...