«

Are there bandpass filters out there that are selective for all in the
IR range, above 800nm. I seem to mostly see narrow bandpass filters for
around 800-/+50nm.

<> wrote in message
news: oups.com...
> Are there bandpass filters out there that are selective for all in the
> IR range, above 800nm. I seem to mostly see narrow bandpass filters for
> around 800-/+50nm.
>
The Hoya RM90 cuts off about 900 nm. Sorry, I can't find any bandpass
filters in the Kodak Filter Handbook. The 87, 88, etc., are all low pass.
Jim

The reason I ask is because of this:

http://www.kaya-optics.com/products/experiments.shtml

I surmise that that is all the $138+$40 S&H filter is doing.

In article < .com>,
wrote:

> Are there bandpass filters out there that are selective for all in the
> IR range, above 800nm. I seem to mostly see narrow bandpass filters for
> around 800-/+50nm.

Yes Heliopan has them up to 1000nm.

--
To reply no_ HPMarketing Corp.

you mean 800-1000, do you know where I can get one in 52mm?

In article < om>,
wrote:

> you mean 800-1000, do you know where I can get one in 52mm?

You can order any Heliopan filter from a camera store.

--
To reply no_ HPMarketing Corp.

<> wrote in message
news: oups.com...
> The reason I ask is because of this:
>
> http://www.kaya-optics.com/products/experiments.shtml
>
> I surmise that that is all the $138+$40 S&H filter is doing.
>
It is probably possible to accomplish this with a Hoya RM72. More likely
though, you would need an RM90. A camera store can order one in whatever
size you need (and can afford, they are quite expensive).
Jim

1.
not all fabrics transmit IR. If a subject of your attention wears
cotton, you may resort to manual removal, camera wouldn't help.

2. Try some very dark/black photo filters. Some security cameras work
in IR and are protected with necessary filters.
3. do not forget to remove filter from a camera. in some cases it
would be impossible, so check beforehand.
4. why spend so much money on a filter, if you can get annual
subscription for fraction of it?


On 17 Oct 2005 14:58:57 -0700, wrote:

<>Are there bandpass filters out there that are selective for all in
the
<>IR range, above 800nm. I seem to mostly see narrow bandpass filters
for
<>around 800-/+50nm.

wrote:

> Are there bandpass filters out there that are selective for all in the
> IR range, above 800nm. I seem to mostly see narrow bandpass filters for
> around 800-/+50nm.

You can get colloidal doped glass filters for IR long pass.
Wratten 87 or RG780 or RG830 would probably work for near IR.

Regards,
Martin Brown