new 35mm slide-mount system
Well, "new" is not quite right, it was introduced 1 1/2 years ago. But as it only has been hinted at briefly here, I thought it a good idea to introduce. All the more so as it is surprising to see a new product in this field:
It is a system that is intended to avoid
-) the micro-chamber effect of glass slide mounts
-) the protruding out of focus of transparencies whilst being projected in glass-less mounts
by employing pins that tension the transparency.
That pinning is not a new idea, new however is the feature of adjusting the pre-tension and to correct for lateral frame position by using pin-sets with different pin positions depending of the transparency to be mounted.
The system consists of
-) 1 pair of hinged plastic frames 4x4 24x36, 3mm thick
-) 12 different flexible pin-inserts
All inserts have the same pitch (lateral distance between pins).
They differ in width between the pin rows (vertical distance to adjust pre-tension) and in lateral pin-row position (to adjust for lateral frame position due to camera misalignement).
Tension is adjusted to a certain bending of the inserts.
Outer mounts in 100pc packages, inserts in 25pc packages.
There is a kind of trial set with inserts of all vertical distances to check for ones films.
slide-mount system DIASPEED HT-XYZ
data-sheet (in German only)
Is "the micro-chamber effect" the same as Newtons Rings ?
Sorry for being ambiguous!
Newton rings could be a problem though they are only a matter of distance between planes.
I was rather thinking of the micro-climate within a slide mount.
a test on these mounts
Fellow member Henning Serger and others published the outcome of a test they did on these mounts.
They tested these films:
all slide films from Fuji, Kodak, AgfaPhoto, Rollei, , Adox, Foma. Including those on PET-base as Superpan 200, Retro 80S, Agfa Copex Rapid, Adox CMS 20 II), sowie dem Agfa Scala 200X, Adox Silvermax und Fomapan R.
with these projectors:
Leica Pradovit PC with Leica Super-Colorplan 2,5/90, Kindermann Silent 2500 with Docter-Optics 2,4/90 MC-B, Zeiss Ikon Royal AF selektiv with Carl Zeiss P-Sonnar 2,5/90, Leica RA 150 with Leica Colorplan 2,5 /90, Rolleivision MSC 535 P and Rolleivision MSC 300 P with the Schneider lenses AV Xenotar 2,4/90 mm HFT, AV Xenotar 2,8/150 mm and Vario-Xenotar 3,5/70-120 mm.
"1. Flatness is very good, with very good sharpnes from center to edges.
2. A pronounced "popping" was not experienced with any film and with any projector.
3. At longer projection times (more than 30 sec.) in very few cases (less than 3%) focus had to be readjusted. But after adjusting again a very good, even sharpness over the whole Image area was gained.
The system of different tensioning frames is convincing and works very well. The evenness over the complete image area, with various types of film, is significantly better than with any other glass-less mount, including the Wess AHX 002, and is on par with glass Mounts. What slide-photographers had long been waiting for came to reality: A glass-less slide-mount that keeps film absolutely flat for projection with sharpness up into the edges, and still yields the ability for horizontal corrections."