 Suzanne Colson |
IR Filters I have seen some breath-taking Infrared images. I went searching on what and how to accomplish, but still have a couple of questions. I have seen a couple of places that can convert a camera to take IR images, but I have also noticed HOYA sells a Infrared filter (R72) to accomplish possibly the same effect. What are the differences, if any, of having my dust collecting Rebel XT converted vs using a filter such at the Hoya R72 Infrared filter? Thanks in advance
|
|
|
|
||
|
Jon Close |
You can use the R72 with a standard XT and other DSLRs. However, the glass low-pass/anti-alias filter that covers the sensor (also called a "hot mirror") tends to block IR, so IR exposures require relatively long exposure times. The conversion involves replacing the low-pass filter that covers the sensor. Replaced with a "clear" filter that passes both visible and IR light allows the camera to be used for both ordinary (visible light) photography and IR, UV or other spectral photography with the appropriate lens filter. Alternatively, the low-pass filter can be replaced with an IR pass filter that blocks visible light and the camera can only record infrared images. In this configuration the R72 filter is not needed.
|
|
|
|
||
|
Jon Close |
P.S. With respect to the "clear" or full-spectrum conversion, I forgot to mention that while ordinary visible light photography is possible, it requires use of UV/IR blocking filters and/or more post-processing to remove the effect of the sensor's sensitivity to UV and IR light.
|
|
|
|
||
|
Jon Close |
P.S. P.S. With respect to the "clear" or full-spectrum conversion, I forgot to mention that while ordinary visible light photography is possible, it requires use of UV/IR blocking filters and/or more post-processing to remove the effect of the sensor's sensitivity to UV and IR light. And when shooting IR, compose and focus has to be done before attaching the R72 filter to the lens since it makes the viewfinder too dark to use. With the IR-specific conversion, the infrared pass filter covers only the sensor, so the viewfinder remains bright.
|
|
|
|
||
|
This old forum is now archived. Use improved Forum here
Report this Thread |
||