• Home made heater for dslr lens

    heater,dslr lens,samyang,fisheye,astrophotography,leca philippe,philippe leca,diyheater,dslr lens,samyang,fisheye,astrophotography,leca philippe,philippe leca,diy
    heater,dslr lens,samyang,fisheye,astrophotography,leca philippe,philippe leca,diyheater,dslr lens,samyang,fisheye,astrophotography,leca philippe,philippe leca,diy

    What is the common point between
    a bike brake cable and astrophotography ?

    An anti-dew heater for dslr's lens !

     

    Finaly, a clear night to make a star trail.

    Unfortunately, the last experience was disappointing : the dew arrived earlier than expected and ruined most of the shots.

    Only one hour to find a solution ?

    No problem : I have a bike brake cable, double-sided Velcro tape and some cables.
    I can built a anti-dew heater for my fisheye dsrl's lens...

    One of the 0.3mm diameter x 1.2m long wire of the brake cable is used : it is the resistor that will produce the heat.
    The wire is made of stainless steel, that is known for its electric resistance.
    It will be connected directly to a 12V powertank. A preliminary with such a wire (same length : 1.2m) produced a soft heat, arround 30°C. A shorter wire produced an excessive heat.

    As my pultimeter is out of order, I couldn't measure the resistance of the wire. I will as soon as I purchase a new multimeter.

    heater,dslr lens,samyang,fisheye,astrophotography,leca philippe,philippe leca,diy

    I sewed the heating wire on the "soft" side of a 50mm x 300mm double-sided Velcro tape (passing the wire in the loops).

    heater,dslr lens,samyang,fisheye,astrophotography,leca philippe,philippe leca,diy

    A second double-sided Velcro tape sandwiches the heating wire and helps hold it in place.

     

    heater,dslr lens,samyang,fisheye,astrophotography,leca philippe,philippe leca,diy

    heater,dslr lens,samyang,fisheye,astrophotography,leca philippe,philippe leca,diy

    As the stainless steel can't be soldered on a copper wire, I made a mechanical connection with a domino.
    The domino is sewed and glued on the tape.

    heater,dslr lens,samyang,fisheye,astrophotography,leca philippe,philippe leca,diy

    Overview of the heater, with a 1.5m long power cable and a ON/OFF switch :

    heater,dslr lens,samyang,fisheye,astrophotography,leca philippe,philippe leca,diy

    Views of the heater in place on the Samyang 8mm fisheye lens :

    heater,dslr lens,samyang,fisheye,astrophotography,leca philippe,philippe leca,diy

    heater,dslr lens,samyang,fisheye,astrophotography,leca philippe,philippe leca,diy

    On these pictures, one can see the difference between

    - star trail without heater : short sequence and blur due to the dew,

    heater,dslr lens,samyang,fisheye,astrophotography,leca philippe,philippe leca,diy

    - star trail with heater : long sequence,without blur.

    heater,dslr lens,samyang,fisheye,astrophotography,leca philippe,philippe leca,diy

    Conclusion :
    Manufacturing in a very short time (1 hour) of an efficient and safe heater (around 30°C).
    This solution makes possible the manufacturing of different size heaters.

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