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Comment by abesad posted on infrared filter at 12/08/2009 - 20:30
grahamwalton wrote:
Susan
When you say that you have a Cokin Infrared filter, is it a screw-in circular filter or a square slide-in type. I ask this because to get good infrared images you need to stop all unfiltered light from reaching the lens. A Cokin square filter may allow daylight to reach the lens down the side; if this is so then you may want to apply some black tape at the edges.
To take infrared photographs on your Pentax K20D, I would use a tripod and take a trial exposure in Manual setting, at 1/15 sec at f8 using 400 ISO. This assumes good sunlight. Be prepared to alter this to 1/8, 1/4 or 1/2 at f8, with ISO settings of 400, 800 and 1600. The higher ISOs will produce plenty of noise and this makes the images look very soft.
I have not tried infrared on my K20D but have taken plenty on my istDL2.
Best of luck with the experiments.
Hi its one you slide into the holder.Susan
When you say that you have a Cokin Infrared filter, is it a screw-in circular filter or a square slide-in type. I ask this because to get good infrared images you need to stop all unfiltered light from reaching the lens. A Cokin square filter may allow daylight to reach the lens down the side; if this is so then you may want to apply some black tape at the edges.
To take infrared photographs on your Pentax K20D, I would use a tripod and take a trial exposure in Manual setting, at 1/15 sec at f8 using 400 ISO. This assumes good sunlight. Be prepared to alter this to 1/8, 1/4 or 1/2 at f8, with ISO settings of 400, 800 and 1600. The higher ISOs will produce plenty of noise and this makes the images look very soft.
I have not tried infrared on my K20D but have taken plenty on my istDL2.
Best of luck with the experiments.
Comment by abesad posted on infrared filter at 12/08/2009 - 20:29
jackitec wrote:
There is an infrared setting on the K20 it's not that good but it does work.
I like the idea of using a filter rather than the one inside the camera,although I have used the inside one, but thanks anyway.There is an infrared setting on the K20 it's not that good but it does work.
Comment by abesad posted on infrared filter at 12/08/2009 - 18:49
johnriley wrote:
All digital cameras are very sensitive to IR so the manufacturers put a filter in front of the sensor to remove some or all of the IR. It can cause colour shifts and loss of contrast.
The *istDS is not too bad in this respect and will work quite well with IR, but the K10D filtered quite aggressively and wasn't so good. The K20D I have not tried.
The technique is to put the camera on a tripod, compose your image, refocusing manually to the IR marker if there is one on your lens. Then put on the filter and let the camera calculate the new exposure. You won't see through the viewfinder at this stage because the filter removes all the visible light.
When the (possibly quite long) exposure is done you will be able to view the very red image on the camera screen. This then needs converting to black and white either in camera if it does it or in Photoshop or similar.
That's it in a nutshell, but there are plenty of books on IR imaging. It can look fantastic with the right sort of subject.
I composed my photo and had while it was on timer, I put the IR filter on before it took the shot.All digital cameras are very sensitive to IR so the manufacturers put a filter in front of the sensor to remove some or all of the IR. It can cause colour shifts and loss of contrast.
The *istDS is not too bad in this respect and will work quite well with IR, but the K10D filtered quite aggressively and wasn't so good. The K20D I have not tried.
The technique is to put the camera on a tripod, compose your image, refocusing manually to the IR marker if there is one on your lens. Then put on the filter and let the camera calculate the new exposure. You won't see through the viewfinder at this stage because the filter removes all the visible light.
When the (possibly quite long) exposure is done you will be able to view the very red image on the camera screen. This then needs converting to black and white either in camera if it does it or in Photoshop or similar.
That's it in a nutshell, but there are plenty of books on IR imaging. It can look fantastic with the right sort of subject.
Comment by abesad posted on infrared filter at 12/08/2009 - 18:45
greynolds999 wrote:
Your K20d has an IR blocking filter in front of the sensor. You can take IR shots but you will need MUCH longer exposures. Best thing is to keep experimenting!
So how long exposure are we talking about. I don't understand this bit about an IR blocking filer in front of the sensor though.Your K20d has an IR blocking filter in front of the sensor. You can take IR shots but you will need MUCH longer exposures. Best thing is to keep experimenting!
Comment by abesad posted on infrared filter at 12/08/2009 - 18:44
I bought a cokin infrared filter to use on my pentax k20d, I tried it out, but no picture, have I done something wrong or does my pentax camera not take infrared. Thanks for any help.
susan
susan
Comment by abesad posted on infrared filter at 12/08/2009 - 18:08
Pentaxophile wrote:
Howabout Kood: link.
Only £3.99, which is a fair price for what, after all, is a flimsy bit of plastic!
Is this a clip on or screw on?Howabout Kood: link.
Only £3.99, which is a fair price for what, after all, is a flimsy bit of plastic!
Comment by abesad posted on Clip on filters holder at 09/07/2009 - 09:07
Thanks stefan.I have been using the default the Ebedded, now will have to go back and see what the difference will be to my photo's, might be better now, now that I know what they are for.
Comment by abesad posted on camera profile In RAW editiing at 09/07/2009 - 09:03
I heard you can get a Lee clip on holder for ND Grad, is there any other make that does this as well. I used to have a screw on, but don't like it, I want something quick and thought of one you can just clip on or off. Any help please.
susan
susan
Comment by abesad posted on Clip on filters holder at 09/07/2009 - 08:48
Under camera profile in the Camera Raw 5.0 there are several names listed,
Ebedded,
ACR 4.4,
Adobe Standard,
Camera Standard,
What are these for and which one should I used when using RAW.
Thanks for any help
susan
Ebedded,
ACR 4.4,
Adobe Standard,
Camera Standard,
What are these for and which one should I used when using RAW.
Thanks for any help
susan
Comment by abesad posted on camera profile In RAW editiing at 09/07/2009 - 08:41
regards susan