Search results for 'uv filter' - page 192
infrared filter
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
Posted by abesad on 12/08/2009 - 18:08
infrared filter
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!
Posted by greynolds999 on 12/08/2009 - 18:13
infrared filter
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 aggressiv...
Posted by johnriley on 12/08/2009 - 18:16
infrared filter
There is an infrared setting on the K20 it's not that good but it does work. :lol:
Posted by jackitec on 12/08/2009 - 18:24
infrared filter
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.
Posted by abesad on 12/08/2009 - 18:44
infrared filter
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 aggressiv...
Posted by abesad on 12/08/2009 - 18:45
infrared filter
There is an infrared setting on the K20 it's not that good but it does work. :lol: 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.
Posted by abesad on 12/08/2009 - 18:49
infrared filter
Basically, the filter you have bought only allows IR through, but the K20d (in common with most DSLRs) has a filter designed to block IR. Therefore the two cancel each other out. Because you now have hardly any light entering the camera you need to use a very long exposure. Just keep experiment...
Posted by greynolds999 on 12/08/2009 - 18:55
infrared filter
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. Generally, internal reflections within a lens can cause flare and loss of contrast. Because the sensor is sensitive to IR light any IR that is being scattered will affect...
Posted by johnriley on 12/08/2009 - 18:56
infrared filter
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 si...
Posted by grahamwalton on 12/08/2009 - 19:43
infrared filter
There's an old thread that might help. There again...:wink:
Posted by Hardgravity on 12/08/2009 - 19:52
infrared filter
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 si...
Posted by abesad on 12/08/2009 - 20:29
infrared filter
Thank you everyone, I read all these comments more thoroughly and try again tomorrow depending on the weather. regards susan
Posted by abesad on 12/08/2009 - 20:30
infrared filter
My attempts at this involved 20 or 30 second exposures with apertures in the f5.6-9.5 range (and 100 ISO). As the guys on here pointed out, it's an uphill struggle given the effectiveness of the sensors' IR filtration. It's worth a try though and I'll have another go if the sun ever comes out agai...
Posted by Conky on 13/08/2009 - 15:22
infrared filter
This was taken with the infrared filter built in to the K20, I don't know how it compares to a proper filter or an infrared camera, any comments. Jack.
Posted by jackitec on 13/08/2009 - 18:09
infrared filter
Just to quickly try the K20D with infrared; today in sunlight I found that, ISO 800 and 2secs @ f8 achieved a reasonable image. These are a lot longer exposures than on the Pentax istDL2.
Posted by grahamwalton on 13/08/2009 - 19:00
infrared filter
Don't know about anyone else but I would like to see some of these infrared images that we're talking about, :shock:
Posted by jackitec on 13/08/2009 - 19:09
infrared filter
Just to quickly try the K20D with infrared; today in sunlight I found that, ISO 800 and 2secs @ f8 achieved a reasonable image. These are a lot longer exposures than on the Pentax istDL2. The filter was changed on the K10D (and presumably all subsequent DSLRs), and it's a much stronger one than on t...
Posted by Daniel Bridge on 13/08/2009 - 19:21
infrared filter
Thanks Dan, that seems a lot stronger filter than the K20 has, I'm not really into this but it does have a nice effect, something different for a change, regards, Jack. :lol:
Posted by jackitec on 13/08/2009 - 20:03
infrared filter
Hi again, have not been able to try out my camera using the filter again as, never guess, well of course, its raining again, so will have to hope that I get a good day during this month.August though is usually a raining month here. I would however like to see some photo's taking from anyone who has...
Posted by abesad on 14/08/2009 - 09:56
