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 EOS 600D/Rebel T3i long-term power and lens-heating solution 
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Joined: Sun Aug 29, 2010 12:38 am
Posts: 36
Location: Czech Republic
Post EOS 600D/Rebel T3i long-term power and lens-heating solution
Hi guys and girls,
fascinated with night time-lapse, I decided to solve two big problems of night time-lapse - power supply and dew protection. Here is my solution.

I have Canon Eos 600D and I use classic 12V lead battery improved with 12V car power port, as you can see bellow. It is cheap and safe - but charger's price is twice higher :-)
Attachment:
File comment: 12V 7,2Ah lead acid battery with 12V car power port
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IMG_0424.jpg [ 71.42 KiB | Viewed 5922 times ]

Attachment:
File comment: 12V car power adaptor and battery
IMG_0428.jpg
IMG_0428.jpg [ 60.45 KiB | Viewed 5922 times ]


Battery and camera is connected with this device - battery pack, I simply buy it on http://astronomiser.co.uk. It works fine. And I must say that e-shop Astronomiser is perfect. Very quick email communication, personal approach and so on. My first battery pack from astronomiser did not work, but Andy from astronomiser quickly replaced with new one! You can buy addapter for another canon cameras. With this device, you can power supply your camera from car battery or from battery with car power port.
Attachment:
File comment: Battery pack from Astronomiser.co.uk
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IMG_0429.jpg [ 86.69 KiB | Viewed 5922 times ]

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my first timelapse-kiss Canon Powershot SX100IS with almighty CHDK hack
Canon EOS 600D, Tokina AT-X 11-16 mm F 2,8, Tamron 17-55 F2,8 XR Di II VC
http://www.doctor.wordpress.com


Sat Jul 28, 2012 4:08 am
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Joined: Sun Aug 29, 2010 12:38 am
Posts: 36
Location: Czech Republic
Post Re: EOS 600D/Rebel T3i long-term power and lens-heating solu
and now, the lens heating.

I used a band of Velcro. You must know circumference of your lens. I measured my lens in the place of "first" lens (I mean the one, which is in the front of lens and affected by dew) - the Velcro band fits here well and do not fall or move. Inside Velcro band is kanthal resistance wire.
Attachment:
File comment: Kanthal resistance heating wire in Velcro band
IMG_0435.jpg
IMG_0435.jpg [ 69.69 KiB | Viewed 5921 times ]


I used 1mm2 copper wire to connect kanthal wire with voltage regulator, because of I want to have it 5m long.

To regulate voltage in my heating band, I bought this one - swithcing power adaptor (1 to 12V) with car power adaptor. Check here http://www.mcmelectronics.com/product/DISTRIBUTED-BY-MCM-MW292-/29-3340
Attachment:
File comment: Voltage step regulator
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I cut the connector of switching power adaptor and connect to copper wire of my Velcro band, as you can see bellow. I dont know how the connection is called - In shop I said I want to connect two wires and have possibility to disconnect them and the salesman gave me this white box :-)
Attachment:
File comment: Switching adaptor connected to Velcro band copper wire
IMG_0433.jpg
IMG_0433.jpg [ 81.94 KiB | Viewed 5921 times ]

_________________
my first timelapse-kiss Canon Powershot SX100IS with almighty CHDK hack
Canon EOS 600D, Tokina AT-X 11-16 mm F 2,8, Tamron 17-55 F2,8 XR Di II VC
http://www.doctor.wordpress.com


Sat Jul 28, 2012 4:33 am
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Joined: Sun Aug 29, 2010 12:38 am
Posts: 36
Location: Czech Republic
Post Re: EOS 600D/Rebel T3i long-term power and lens-heating solu
and we continue...

On the photo bellow you can see whole heating system. Switching power regulator, small white box AKA connection, 5m of copper wire and Velcro band with kanthal resistance wire.
Attachment:
File comment: My own heating system
IMG_0434.jpg
IMG_0434.jpg [ 91.76 KiB | Viewed 5921 times ]




and finally, you can see the whole thing :-) From right to left - the battery, 12V car power port, 12V power splitter, heating system and battery pack and finally the camera.
Attachment:
File comment: My power and lens heating system
IMG_0441.jpg
IMG_0441.jpg [ 77.52 KiB | Viewed 5921 times ]


I hope it will help someone.

_________________
my first timelapse-kiss Canon Powershot SX100IS with almighty CHDK hack
Canon EOS 600D, Tokina AT-X 11-16 mm F 2,8, Tamron 17-55 F2,8 XR Di II VC
http://www.doctor.wordpress.com


Sat Jul 28, 2012 4:40 am
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Joined: Sun Aug 29, 2010 12:38 am
Posts: 36
Location: Czech Republic
Post Re: EOS 600D/Rebel T3i long-term power and lens-heating solu
and finaly a few words about:

Kanthal resistance heating wire
- you must do some math before you made your own heating band
- I did some internet research about this topic and I found thath desired electric power for heating band is around 5Watts.
- In my band (depends on the lens circumference) I used 0,22m of 53,1Ohm kanthal wire
- in theory, I can reach 5Watts in my band with voltage 7,5V - it is possible, switching regulator can from 1V - 12V.
7Watts with 9V
10Watts with 12V

- electric power (P) depends on the lenght (L) and electrical resistance (R) of kantal wire and voltage (V) - that is why you need to do some math
- but it is simple P = U*U / L*R

- I made some measurement - measured in 25°C and no wind
- 0,22m of 53,1 Ohm kantal gives 50 °C in the band with 4,5V voltage
- 0,22m of 53,1 Ohm kanthal gives 100°C in the band (not outside the band) with 7,5V voltage
- 100°C seems to be a lot, but I tested in 15°C outside and it was just right to heat lens and dissolve dew


Battery size
- I use 7,2 Ah battery, in theory it should last for 8 hours of heating and powering the camera, the weight is acceptable
- I thing it is enough for one night
- I am about to make some heat isolation box for battery because i want to use it in a cold weather - the stars are nicer :-)

Improvement
- At first, I was about to use power splitter for 3 devices (http://www.dealextreme.com/p/3-socket-triple-socket-car-cigarette-lighter-charger-adapter-with-usb-port-black-dc-12-24v-57256)
- the third device would be the notebook - to control camera, to avoid boredom
- but the size of battery would be very limitating - I count with 80-110 Ah traction batteries and it is about 15Kg of weight - it is ok when you travel with car - you can have this small electric facility in car

- you can also made second or third Velcro band for all your lens, because "the white box" is not permanent connection

_________________
my first timelapse-kiss Canon Powershot SX100IS with almighty CHDK hack
Canon EOS 600D, Tokina AT-X 11-16 mm F 2,8, Tamron 17-55 F2,8 XR Di II VC
http://www.doctor.wordpress.com


Sat Jul 28, 2012 4:59 am
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Joined: Thu Dec 13, 2012 10:16 am
Posts: 1
Post Re: EOS 600D/Rebel T3i long-term power and lens-heating solu
Hi doctor!

I'm trying to replicate your instructions, it's great!! All is very well thought and explained, congratulations!!

I'm making some changes to the design, I'm building my own wires and I linked 2 different pair of wires directly to the battery, to not use a cigar lighter hub.

The hardest part is the kanthal wire. I've studied a lot the thermal and power knowledgment to calculate theorically the power and intensity I need to get the 100ºC but I haven't succeed :( In any case, I will use your 22cm of kanthal D 1.8mm to the heating, it's for the same lens you have, the Tokina 11-16.

Could you help me answering a pair of questions??
- what type of textile material did you use to build the heating band? I cannot appreciate exactly what's made of.
- Did you put only one strip of wire inside the band? I'm thinking in place 2 tires on kanthal instead of one, I'm afraid of not having sufficient heat for the dew.

As a final note, I used a 12V 12Ah sealed lead-acid battery from electronic shop, it weights only 4kg and have enough power to feed the camera and heater for 18 hours.

I will upload my excel spreadsheet with all the calcs when I will have finished the project.

Thanks for sharing!! :D


Thu Dec 13, 2012 10:31 am
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Joined: Sun Aug 29, 2010 12:38 am
Posts: 36
Location: Czech Republic
Post Re: EOS 600D/Rebel T3i long-term power and lens-heating solu
Hi lotomas, thank you and sorry for late answer.
The material is Velcro
and I put there only one wire into the velcro - to the closest position to lens - I dont want to heat whole lens, only the first one.


I designed it to 5-7Watt of electric power. You can see my tab with some calculations
original is from my page www. doctor.wordpress.com

Image

translation - délka = lenght
napětí = voltage
výkon = power

So you can see, that desired electric power between 5-7W my construction reaches with 7,5 - 9 Volts - theoretically. And this gives 100°C measured on wire.

_________________
my first timelapse-kiss Canon Powershot SX100IS with almighty CHDK hack
Canon EOS 600D, Tokina AT-X 11-16 mm F 2,8, Tamron 17-55 F2,8 XR Di II VC
http://www.doctor.wordpress.com


Fri Mar 29, 2013 12:55 pm
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Joined: Tue Oct 04, 2011 7:14 am
Posts: 68
Location: Dublin Ireland
Post Re: EOS 600D/Rebel T3i long-term power and lens-heating solu
Thanks for this,

What would happen if i used this strap without the volt stop regulator?
https://www.astronomics.com/thousand-oa ... p4913.aspx

with this battery
http://cpcireland.farnell.com/_/in06007 ... dp/IN06007

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Fri May 10, 2013 2:02 am
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Joined: Sun Aug 29, 2010 12:38 am
Posts: 36
Location: Czech Republic
Post Re: EOS 600D/Rebel T3i long-term power and lens-heating solu
I am not sure. I cant find any information about heating band parameters. But the price is really nice - 39$. My end price was around 10$ and, of course, 2 hours of my preciuos time, which is priceless :-)

_________________
my first timelapse-kiss Canon Powershot SX100IS with almighty CHDK hack
Canon EOS 600D, Tokina AT-X 11-16 mm F 2,8, Tamron 17-55 F2,8 XR Di II VC
http://www.doctor.wordpress.com


Mon Aug 12, 2013 12:22 am
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