[mythtv-users] IR transmitter help

R. G. Newbury newbury at mandamus.org
Sun Jul 3 14:59:59 UTC 2011


On 07/03/2011 06:47 AM, Kyle Gordon wrote:
> On 03/07/11 11:32, Mike Perkins wrote:
>> On 03/07/11 04:25, Eric Sharkey wrote:
>>> On Sat, Jul 2, 2011 at 4:43 PM, Doug Lytle<support at drdos.info>    wrote:
>>>> Eric Sharkey wrote:
>>>>> I presume it's
>>>>> sending IR as well
>>>> You can confirm this by pointing the view finder of a digital camera at
>>>> the transmitter.  IR is be visible though that.
>>> For that to work I'd need a very special digital camera or filter.
>>> Given that there is a visible light flash at the same time, and I
>>> don't have any camera which isn't also sensitive to visible light, the
>>> flash on the camera screen wouldn't tell me anything I don't already
>>> know.
>>>
>> Nope. *Any* digital camera is capable of seeing the infra-red from a remote (or
>> blaster), even the cheapo ones.
>>
> Isn't the point here that an IR flash would be obscured by the already
> visible _visible light_ flash?
>


Not ALL digital cameras can 'see' IR. Some cameras have a built-in  IR 
filter specifically to prevent IR from affecting the auto-exposure. The 
Nikon D90 is one. You cannot do IR photos with it. (IIRC, the filter is 
built into the CCD sensor in the D90).

Geoff


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