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Imatest Documentation Tripod and accessories The $99 USD Stanley 77-910 - TLM 100 FatMax Tru-Laser Distance Measurer shown above was added to the lab in November. 2007. It is very convenient for measuring precise distances— much more accurate than the measuring tape shown on the left. The tripod should be sturdy, easy to adjust, and easy to move. Any good tripod with a pan/tilt head should work. Ball heads are not recommended for the lab. A head that takes quick-release plates is strongly recommended. Any tripod can be adapted for quick release with the Bogen/Manfrotto RC2 adaptor, which is supplied with one 3157N plate. We illustrate a few Manfrotto components, which offer good value for the price. These represent typical choices; many more are available to meet special needs. Manfrotto 475 or 475B tripod legs with geared center column - supports 26.5 lbs. Height 16.6 – 74 in. A geared center column is not strictly necessary (we don't have one on our old Bogen/Manfrotto 3021BN), but can be convenient in a tripod dedicated to a test lab. The built-in spirit level is valuable for leveling the tripod: If the base (where the head is mounted) is level, fine adjustments are much easier to make because head movements (swivel, etc.) don't interact. Manfrotto 804RC2 3-way pan-tilt head with quick release - supports 8.8 lbs. A very nice head, very reasonably priced. Uses the versatile RC2 quick release system. Get several 3157N mounting plates if you purchase this head. Manfrotto 3275 / 410 compact geared head with quick release - supports 11.1 lbs. A more elegant475B tripod legs but more expensive head: especially nice for making precise adjustments. Uses the less common 3271 quick release mounting plate. Manfrotto 3137 variable leg spread portable dolly. Very useful for keeping legs in place while moving the tripod. 804RC2 pan/tilt head 3275/410 geared head Manfrotto 3137 dolly Manfrotto 3416 leveling head. Optional. The level built into the 475B (and several other) legs may suffice for most users. Mounts between the tripod legs and the head. Ensures that the base of the head is level so that the various movements (swivel, etc.) don't interact. This greatly facilitates fine adjustments. Clamps Although a regular quick-release tripod mount is fine for most cameras, a good sturdy clamping system is needed for testing cameraphones and webcams. We put two of them together after 70 of 451
Imatest Documentation rummaging through the aisles of Home Depot. They consist of Irwin Quick-Grip Mini or Micro bar clamps mounted on Manfrotto quick release plates. The images below give a good idea of how they're constructed. A hole had to be drilled in the larger clamp (above) and enlarged in the lower clamp (below) to accommodate the 1/4 inch bolt. Clamp parts (top to bottom) Larger (Mini) clamp (above) 1.5" long 1/4" bolt 1/4" coupling nut Irwin Quick Grip Mini bar clamp 1/4" coupling nut "T"-brace Quick release plate The larger clamp (the Mini) is sturdier, and has proven to be more useful. Putting it together Smaller (Micro) clamp (below) 3/4" long 1/4" bolt 1/4" washer Irwin Quick Grip Micro bar clamp large 1/4" washer 1/4" coupling nut "T"-brace Quick release plate The image below summarizes how the lights should be positioned. The goal is even, glare-free illumination. The lamps represent the stacks of three SoLux track lamps, described above. This may involve a tradeoff, especially with wide-angle lenses. Lighting angles between 35 and 45 degrees work well for normal and long lenses. Avoid lighting behind the camera, which can cause glare. Ambient light should be kept subdued. Check carefully for glare and lighting uniformity before you expose, especially with wide angle lenses, where glare can be difficult to avoid: you may have to move the lights further than normal from the target— or allow glare in portions of the target, taking care that it doesn't affect critical areas. Use the meter to check for the evenness of lighting. ±20% over the entire target is sufficient for SFR and Distortion measurements, where small portions of the target are analyzed and exposure is not critical. ±5% or better should be the goal for tonal and color measurements (Stepchart, Colorcheck, and Multicharts). This should be easy to achieve because illumination only needs to be even on the relatively small charts themselves, not on the entire target. The widest (the Kodak Q-14) is 14 inches (35 cm) wide; most are under 11 inches (28 cm). Lighting uniformity is strongly affected by the distance and orientation of the lamps. Our lamps are roughly 50 inches (125 cm) from the center of the target. 71 of 451
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