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Imatest Documentation Drill holes large enough for an 8-32 bolt about 1.25 inches (3.5 cm) below the top of the upper shaft of the microphone stand and about 10 inches (25cm) below the top of the track (the end without the cord). The head of a 1.25 or 1.5 inch 8-32 bolt is placed inside the track, then attached with two nuts on the back of the track to provide a little spacing with the stand. A wing nut (optional) is used to secure the bolt to the stand. [Parts sequence: 8-32 bolt (head), track, 2 8-32 nuts, upper shaft of microphone stand, 8-32 wing nut.] (CAUTION: do not do this unless you know how to work with electrical wiring safely. DO NOT do this when the track is plugged in! ) The remainder of the track is attached to the stand by a combination of materials that allow the stand to be raised and lowered. Cambuckles and nylon webbing. Nice because they put tension on the webbing when they are closed. 1 inch and 2 inch Available from REI. Strapall heavy-duty Quick Tape, available from REI and many other sources. This is a strong double-sided Velcro tape. Sticky-back Velcro tape. Can attach to both the mic stand and the back of the track, but contact area is limited. The lights are mounted near the top, middle, and bottom of the 40 inch high targets. If you have a large budget and need high intensity illumination, check out the Imaging Resource laboratory-grade lighting system, which uses HMI lamps. Easel The Mabef M-10 easel was chosen because it was sturdy, could be adjusted vertically (checked with a small level), had just the right features, and was on display at a local art supply store. A self-adhesive felt pad on the bottom of the upper clamp helps secure targets. Light measurement The BK Precision 615 Light meter (Lux meter) is an outstanding low-cost instrument (about $100 USD) for measuring incident light (illuminance). It has a flat diffuser and photopic response (similar to the human eye in bright light). It is particularly useful for measuring evenness of illumination. We purchased ours from Action Electronics, which offers several alternative choices. The BK was chosen over similar Easyview meters because it has a flat (rather than hemispheric) diffuser that better represents the geometry of the flat targets. Readings can be somewhat slow, with settling times around 3-5 seconds. Miscellaneous Several additional items can come in handy: a small level, a flashlight (LED models are cool), rulers, a few clamps, etc. A bubble level mounted on a camera's accessory shoe can be particularly helpful. A few Irwin Quick-Grip Handi-Clamps are useful for attaching the targets to the easel. 104 of 451
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 105 of 451
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