VERASCOPE F-40 Model II Transposing Stereoscope	C.1955 This exceptional stereo viewer from Jules Richard was made as a companion to the Verascope F40 camera . It is very rare, as most F40 cameras were bought with the more common non-transposing viewer. This viewer transposes the image pairs so it is possible to view the stereo photos directly from an un-cut roll of film : the roll of film is placed in one end of the viewer, and threaded through a film gate (much like those found in a camera), and out the other end into a take-up roll of film. The film is advanced through a knob at the back of the viewer ; there is a sprocket in the middle of the film gate which engages the roll. The viewer uses natural light as a source for illuminating the slide, but a novel feature is that the light enters the viewer through a diffuser in the top of the body (rather than at the end as in other ambient light viewers). This is very convenient as most light sources are overhead, so it is easy to maximise the amount of light entering the viewer. Once the light enters the viewer it passes through the film in the gate of the viewer, and then enters a penta-prism (one for each lens), which reflects the image from the film through a right angle, and flips the image so that it can be viewed in the same orientation as the original scene (remember that the camera records an image flipped upside down, and flipped left-to-right, making direct stereo viewing impossible). This novel design feature has the effect of transposing the original film images so the stereo photo can be viewed without cutting the film and mounting into slide mounts. The viewer has focussing and lens-spacing adjustments. The focal length of the lenses appears to be about 50mm, with a diameter of 25mm, and the film gate is designed for viewing European format stereo images (24 x 30mm).
KODAK	C.1955 KODASLIDE Model 1 Similar design to the Realist but lower quality lenses. Focus and interocular adjustments . Works on 2 D size batteries. For Realist format slides.
KODAK	C.1955 KODASLIDE Model 2 Similar design to the model 1 but with improved quality color corrected achromatic lenses. Focus and interocular adjustments . Can be used with DC adapter or with 2 D size batteries. For Realist format slides.
DAVID WHITE COMPANY	Model ST-61 or 2061 RED BUTTON. Achromatic lenses. Adjustments are provided for inter-ocular separation and focus. Introduced in 1947, it remains one of the best viewers to use. For Realist format slides (41x101 mm). Some users modify the ST-61 to use it with full-frame size slides (see DrT's website)
RAUMBILD VERLAG	C.1930-50 Folding metal viewer for stereoviews. Sold with a book (Anno Santo 1950) and prints in xcm format.
WILD TSP1 MIRROR STEREOSCOPE	C.1980 This is a quality mirror stereoscope in original case with instructions and the original receipt dated 1982 (cost in 1982 more than 200 US dollars). Instructions in English, German, French and Spanish languages. It was made by WILD HEERBRUGG in Switzerland and is the model WILD TSP1. Made of hard and heavy green "plastic" ; this is really a quality thing.
BREWSTER Type stereoscope	C. 1930 UNIS FRANCE Early wooden hand-held stereoscope viewer with adjustable focusing lenses, rack focus. The hinged top mirrored (reflector) door opens so that light can enter to view regular stereo view. Designed for 6x13 cm slides or prints.
Cardboard Stereo Viewers	For B/W positive slides. Various formats (from 45x107 mm to 6X13cm). These are French and made mostly by Bruguiere in 1940-50.
CELDE	C.1950 French cardboard Viewer for film strips. Format 45x107 mm. Films are from Stereofilm Alain.
STEREO INDUPOR GMBH	C.1925-50 Made in Germany (Frankfurt) Simple metal folding viewer for 9X12 cm stereoviews (two 55x75 mm pics). Found with the MECUM stereo Box (which is probably from same manufacturer)
ISOSTEREO	C.1930 HOLMES Type Stereoscope found in its original box with a lot of stereoviews. Metal and wood. Made in Germany.
SIMPLEX	Model SIMPLEX made by LESTRADE, France. Several variations through the years. Sold today mainly on touristic sites. (Disneyland,...) For card mounted slides
STEREOCLIC	Made by BRUGUIERE, France This is a focusing model designed for cards.
ROMO	Similar design to the Lestrade Simplex. Also for cards.
VIEW-MASTER	Lighted model N produced 1992-98. It can be used either using the ambient light or by bulb.
VIEW-MASTER	This beige Model G was made in Belgium by Sawyers between 1959 and 1977
VIEW-MASTER	Produced 1975- 1994 This model J was only manufactured in Belgium. Marked GAF
VIEW-MASTER	Produced 1989-96 Simple viewer with a Mickey Mouse face plate. This square glass version was unique to the European Market and made to accommodate the square shape of the Belgian Model J Viewer.
Plastic LORGNETTE	High quality Plastic viewer with prismatic lenses. This viewer is made for viewing Holmes type cards (the most popular format of stereo prints) and can be used for smaller cards or for the 3D images in some books. The rounded lenses model is for smaller pictures.
Full frame 3D viewer	This plastic viewer has good optics and high quality construction. It is for Realist format stereo images up to RBT slides. Thanks Paul (once again)
Elvira 3D viewer	This interesting plastic viewer has interchangeable caches. So you can use it for realist slides or for two standard 5x5 cm full frame slides.