Digital BW, The Print

And then there's the Canon 20da, which is intended for Astrophotography 
work, but has a different IR low-pass filter that is apparently very 
IR-friendly. It's just been introduced to the world market (Previously 
it was a japan-only camera).

-Adam




koloshor wrote:
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "lulalake_1999"
> <lulalake_1999@y...> wrote:
>  > John,
>  >
>  > Thanks for your reply. It's my understanding that the Bayer filter is
>  > more or less impossible to remove without destroying the sensor. Is
>  > this your understanding?
>  >
>  > Also since Foveon has no Bayer filter it would seem that Sigma cameras
>  > might be an excellent candidate for IR conversion, based on the sensor.
>  > Unfortunately I haven't seen many examples of a Sigma conversion,
>  > plenty of Canons and Sonys.
> 
> That's because there's no such thing as a "Sigma conversion". It
> doesn't need one ;)
> 
> On the Sigma SD10, the IR blocking filter is incorporated in an
> optical window (called the "dust protector") right behind the lens
> mount. It is removable for cleaning. All you have to do is remove one
> screw, put the dust protector someplace safe, and you're good to go.
> The camera even comes with the screwdriver (and the procedure for
> removing the dust protector is documented in the manual).
> 
> So, in the field, in 2 minutes flat, you can switch your Sigma SD10 to
> IR, or back to visible light.
> 
> The IR performance is excellent. The Sigma forum on dpReview maintains
> a large user gallery on pBase, and you can see many fine examples there.
> 
> I typically tell people the SD10 is the best camera currently on the
> market for IR. And it's very good for near UV, too.
> 
> Note that the older Sigma SD9 has its IR blocking filter on the
> surface of the sensor window, and you can't remove it without doing a
> lot of damage. You want SD10.
> 
> 
> 
> 
> Please visit the Group Homepage to check the Files, and other resources 
> as they are often being updated.
> 
> http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint
> 
> If you wish to receive no emails or just a daily digest, or you wish to 
> unsubscribe, please edit your Membership preferences by visiting this 
> same page.
> 
> Please follow these basic guidelines:
> - As threads develop, trim off excess portions of earlier messages to 
> keep them short.
> - Good manners are required at all time. No personal attacks or flames. 
> Hostile, aggressive or argumentative users may be removed from the 
> membership without notice.
> - Keep your posts and threads related to the group topic of digital B&W 
> printing. Users who persistently make off-topic posts may be removed 
> from the membership.
> - By posting on this forum you agree to abide by the group rules and 
> guidelines, and to abide by the actions and decisions of the group Owner 
> and Moderators. See \ufffdGroup Topic, Rules and Guidelines\ufffd in the Files 
> section:
> http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint/files/
> 
> BY PARTICIPATING IN AND/OR POSTING MESSAGES TO THE DIGITAL BW, THE PRINT 
> YAHOO! GROUP YOU EXPRESSLY UNDERSTAND AND AGREE THAT THE \ufffdOWNER\ufffd AND 
> \ufffdMODERATORS\ufffd OF DIGITAL BW, THE PRINT YAHOO GROUP SHALL NOT BE LIABLE TO 
> YOU FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL OR 
> EXEMPLARY DAMAGES, INCLUDING BUT NOT LIMITED TO, DAMAGES FOR LOSS OF 
> PROFITS, GOODWILL, USE, DATA OR OTHER INTANGIBLE LOSSES (EVEN IF THE  
> \ufffdOWNER\ufffd AND \ufffdMODERATORS\ufffd OF DIGITAL BW, THE PRINT YAHOO GROUP HAVE BEEN 
> ADVISED OF THE POSSIBILITY OF SUCH DAMAGES), RESULTING FROM: (i) THE USE 
> OR THE INABILITY TO USE THE DIGITAL BW, THE PRINT YAHOO GROUP; (ii) 
> UNAUTHORIZED ACCESS TO OR ALTERATION OF YOUR TRANSMISSIONS OR DATA; 
> (iii) STATEMENTS OR CONDUCT OF ANY THIRD PARTY ON THE DIGITAL BW, THE 
> PRINT YAHOO GROUP; OR (iv) ANY OTHER MATTER RELATING TO THE DIGITAL BW, 
> THE PRINT YAHOO GROUP.
> 
> 
> 
> ------------------------------------------------------------------------
> *Yahoo! Groups Links*
> 
>     * To visit your group on the web, go to:
>       http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint/
>        
>     * To unsubscribe from this group, send an email to:
>       DigitalBlackandWhiteThePrint-unsubscribe@yahoogroups.com
>       <mailto:DigitalBlackandWhiteThePrint-unsubscribe@yahoogroups.com?subject=Unsubscribe>
>        
>     * Your use of Yahoo! Groups is subject to the Yahoo! Terms of
>       Service <http://docs.yahoo.com/info/terms/>. 
> 
>