Sorry for my absence for a while, again I am engaged in many jobs and studies and I have lack of time
Dear Birma I have just started to experience with IR photography because I liked a lot after having a look to some images of my friend who
has been experiencing in it for a long while. At first I read somewhere that my Minolta 35-70 f4 is infrared compatible lens and I have also read in the internet that a700 is sensitive to some part of IR radiation and some nice images can be shoot without any camera modification.
But I also knew that I will need a high shooter speed values like 20 or more seconds for sunny winter day. Hence I took 3 filters form ebay.
One was 720nm Hoya filter which is very famous and qualitative filter. Another 2 were 850nm and 950nm filters which are mainly capturing in black and white tones. As it was supposed I liked the 720nm filter more because of some colors.. But I still have a problem I can't get sharp images as I was planning. I start thinking that my Minolta lens's antireflective coatings are not antireflective any more in the infrared region of electromagnetic wave spectrum which is the reason of some glare in my images. In IR photography it is common to set the white balance according to the blue clear skyes, but whenever I try to do it my camera shows WB error which means that it is not supposed to have that kind of WB values I don't know why. If you can explain I will be happy. Hence I capture in autoWB mode after which I change it in lightroom, but I don't like this way. Of course I didn't try to capture many images I did only a few and even the sun radiation level was bad which is I think quite important. Simply I didn't have time, I am going to tray in a nearest opportunity. By the way my friend has modified a few point and shoot cameras removing the inner hot mirrors which block the IR radiation and the sensitivity of theur CCD's are quite good, he is able to capture without a tripod and he is observing the real image appearance in the life view mode which is not present on my A700. I am sure that the best way is to start form point and shoot with corresponding filters. But what about the filters I think that Hoya 720 is also a good solution.