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       Leonids 
        '01  recording with a Watec-902H and wide angle auto-iris lens 
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       yKChia 
        Nov 26 01 Rev 1.2 
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          I 
        first tried out a watec 902H and a 3.8 mm f/0.8 auto-iris lens 89 x 
        69 degree FOV lens on a tripod in desert camp of Jordan (1999). The 
        result was pretty interesting - at UT 02 hrs -just two hours before peak 
        then I recorded a total of 35+ Leonids in slightly half an hour. Encouraged 
        by the low light detectability of this simple set-up I repeated this year 
        November 19 Leonids in Bohyunsan Optical Astronomical Observatory,Korea 
        with a similar ccd and lens. This time the video was recorded using a 
        Digital 8 Sony video walkman GV-D800E running on 1-hour duration in LP 
        mode. Upon my return from Korea I spent some time watching and counting 
        the meteors in a high resolution b/w  
      
        montior. In total I had recorded a minimum of SIX HUNDRED & THIRTEEN 
        (613) meteors in just 1.88 hrs effective hours. The 'one-minute' 
        bin was depicted in the graph attached here. There are spikes where high 
        counts are seen momentarily. [The red line indicate the cumulative counts.] 
        Despite missing data in three periods the overall envelope indicate a 
        broad plateau at least for the BRIGHT meteors brighter than mag 1.0. To 
        achieve a lower detection magnitude, another longer focal length lens 
        could be used. My brand new 25mm f/0.90 Avenir TV lens and watec-902H 
        had a LM Of ~+8.0 and FOV of 13 x 8 degree. I used this pair for train 
        spotter. Too bad the Li-ion battery of this recorder failed which prevented 
        me from recording extended hours. In this short duration tape a torrents 
        of faint meteors at burst rate 1 per second was seen accompanying the 
        brighter one.  | 
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| ( under construction) First trial of Meteor Train using video - Avenir 25mm & watec 902H | ||||
| ( under construction) How the Canon T-70 Array stack up against watec.[ hint : no fight] | ||||
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