Originally posted by nathancombs where do you get a 3-watt infrared lamp and how do yo know if it fits thats a HELL of a good idea
Finding the right bulb may require some experimenting. The technical name is an
infrared emitting diode, a type of LED found at most electronics outlets. Just make sure to find one capable of handling the 3-volts delivered by the two AAA batteries (most LED's are rated at 3.2v. which is just fine). At that point, it's just a matter of finding a diode with enough actual light output, combined with any reflective surface inside the Sima SL-9, to serve as a focus assist. Something close to 3-watts might be nice, but likely nearly impossible to find. If anyone finds one, please let me know.
One might also be able to scrounge a diode from an old flash unit with a focus assist, but pay attention to the voltage. Again, the diode, used in this manner, must be capable of handling at least 3-volts (the two AAA batteries). Note voltage and wattage are two different things here - the 3-volts are required, while the 3-watts are not. To explain, the light bulbs in your home are either 120-volts (USA) or 230-volts (Eur), but different wattage light bulbs (60-watts, 75-watts, etc) can be used in those light sockets safely.
As for fit, the pins of a new diode are often long enough to bend to fit nearly any application. One final note. The Sima SL-9 is a simple on/off light with no electrical connections to the camera, so there is no risk of damage or incompatibilities with your Pentax gear. Simply turn the Sima on when focus assist is needed and off again when not. Good luck with any experments done in this regard.
stewart
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