I have also had no luck with much of anything under 2:1 mag with stacked lenses - vignetting also.
edit:
Why don't you just reverse a standard zoom lens? As long as you use an FD lens with an aperture ring, it will give you a magnification range in the area that you are looking.
Search found 273 matches
- Tue Mar 26, 2013 2:57 pm
- Forum: Equipment Discussions
- Topic: Zoom Tube Lens for Numismatic Photography
- Replies: 26
- Views: 5905
- Tue Mar 26, 2013 2:55 pm
- Forum: Equipment Discussions
- Topic: Zoom Tube Lens for Numismatic Photography
- Replies: 26
- Views: 5905
I haven't found zoom lenses to work well when stacked. USing an internal focus lens as you tube lens will work since they change their focal length with the focus ring. My 200/4 micro goes from about 200 to 100 mm from near to far focus and will give about a 2:1 magnification range. Anything shorter...
- Sun Jul 29, 2012 1:43 pm
- Forum: Equipment Discussions
- Topic: Cheap way to photograph coins
- Replies: 5
- Views: 3216
Ray summed up things pretty well. I would tend to rank the cameras: barely OK - USB microscope (OK for close-ups of coin parts, not so good for a whole coin) adequate - compact camera best - SLR with macro lens I wrote an article on basic coin photography a few years back (I also have written a book...
- Fri Feb 10, 2012 1:43 pm
- Forum: Equipment Discussions
- Topic: Useful Life for a Camera Body
- Replies: 13
- Views: 4071
- Mon Dec 26, 2011 10:28 am
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: idea to fight the diffraction?
- Replies: 4
- Views: 2488
Another problem with shoot images at a lower magnification than an objective is designed is that you may start to vignette the entrance pupil. With most high magnification objectives, you can only see the whole entrance pupil when you get very close to the objective (about the working distance). whe...
- Thu Oct 27, 2011 10:09 am
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: Does it really worth reversing enlarger lenses ?
- Replies: 4
- Views: 3413
my own experience with rev vs. normal mounting for enlarging lenses comes down mainly to focal length. Longer focal length, say 75 mm and above don't work any better reversed, and may work better normally mounted. 50 mm and below tend to work better reversed. The shorter the focal length the more im...
- Wed Oct 05, 2011 5:52 pm
- Forum: Equipment Discussions
- Topic: Long CA effect on apparent color
- Replies: 9
- Views: 2943
I can certainly agree that long CA can affect the color seen on highlights and edges. In more complex areas you will probably see a little too much of the color in the fringe. In homogeneous areas it should all even out. I will also depend upon how much depth you have in the image. A stacked image w...
- Sat Sep 17, 2011 9:16 am
- Forum: Equipment Discussions
- Topic: Silver componon 80mm F/5.6
- Replies: 16
- Views: 5572
- Wed Aug 31, 2011 3:04 pm
- Forum: Equipment Discussions
- Topic: Pupil ratio of Sigma 150mm macro lens.
- Replies: 3
- Views: 2633
- Wed Aug 31, 2011 7:51 am
- Forum: Equipment Discussions
- Topic: Canon TS-E 90 f/2.8
- Replies: 16
- Views: 6297
Tilt: tilts the focus plane. I use a Nikon 85 PC micro for my coin photography because it allows me to tilt the coin into the light while keeping everything in sharp focus. DOF is the same as always although the tilted focus plane makes the depth of field a cone shape (closer portions of the focus p...
- Mon Aug 29, 2011 7:54 am
- Forum: Equipment Discussions
- Topic: Apochromatic and achromatic at the same time?
- Replies: 3
- Views: 2082
- Sun Aug 28, 2011 5:10 pm
- Forum: Equipment Discussions
- Topic: Apochromatic and achromatic at the same time?
- Replies: 3
- Views: 2082
My own reading on the subject suggests that achromatic/apochromatic correction mainly deals with longitudinal CA (focal length variation with wavelength). Lateral CA (magnification difference with wavelength) is a different problem and requires a different process to correct. Achromatic is corrected...
- Sun Aug 28, 2011 9:17 am
- Forum: Equipment Discussions
- Topic: Pupil ratio of Sigma 150mm macro lens.
- Replies: 3
- Views: 2633
If you know the position of the principal planes and the pupils, you can figure out the pupillary ratio. I think that the numbers are measured from the back focal point, the detector. The rear principal plane is at 146.5 - i.e. the focal length of the lens. The front principal plane is at 127.5 - th...
- Wed Jul 20, 2011 9:16 am
- Forum: Equipment Discussions
- Topic: Optical test patterns
- Replies: 1
- Views: 1297
- Thu Jul 14, 2011 10:52 am
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: If I use flash, Is everything perfect?
- Replies: 20
- Views: 7103