(meteorobs) Camera Modification

Jodie Reynolds spacerocks at spaceballoon.org
Sat Jul 6 16:52:53 EDT 2013


Hello Jay,

It's always best to immediately replace the IR cut filter with glass.
 The sensor is so small and low-resolution that going with optical-grade is rarely a
 requirement fpr these, the degradation offered by pane glass over such a small
 area is rarely worth the trouble of sourcing optically "perfect"
 glass.  If you really want to though, a good quality UV filter for
 DSLRs can be cut down to fit pretty inexpensively.

 As they're a bit thicker, it may change the focal plane a little and
 you'll lose close-focus, but given the application, that's hardly an
 issue worth noting. The big key is keeping it level with the
 sensor's surface, or you'll get fuzzing around the edges of the
 image.

 I'm not sure what the adhesive used on the 165DNR is, but I do know
 the actual manufacturer of that camera, so I shot off a quick email
 to our rep to ask him to pass it along to engineering support.  You
 might try isopropyl alcohol ON THE FILTER's residue and see if that
 comes up cleanly - it's used to clean CCDs in manufacture, so it
 won't damage the sensor if it turns out it'll cut the adhesive
 without smearing on the filter side.

 --- Jodie



Saturday, July 6, 2013, 12:21:26 PM, you wrote:

> Camera Modification

> Last year I purchased a Model PC165DNR Camera from Supercircuits to go into
> a Meteor observatory of my own making. A few weeks ago, I disassembled the
> camera and peeled off the IR filter from the sensor. This ruined its Color
> Fidelity but boosted its sensitivity which is spectacular. The peril in
> doing this is that any particulates inside the camera make their way onto
> the sensor. The filter allowed the particulates to accumulate far above the
> focal plane (the sensor), removing the filter brings anything on the sensor
> window in focus. The sensor is so tiny and difficult to reach, cleaning away
> anything stuck to the quarter inch sensor window becomes next to impossible.
> I used a camera lens blow-bulb, which helped but there is another problem.
> The IR filter was attached with glue which is so close to the sensor that
> attempting to clean the sensor, smears this adhesive onto the sensor.

> Jay Salsburg

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> meteorobs at meteorobs.org
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-- 
Best regards,
 Jodie                            mailto:spacerocks at spaceballoon.org



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