Longwatcher
18th of July 2003 (Fri), 23:30
This afternoon I finally recieved my IR filter to try out with the 10D. The filter is the Hoya R72 filter. I got the 58mm thread version.
jpeged example at:
http://www.longwatcher.com/images/CRW_2939-IR%20test.jpg
I used my 50/1.4
4 secs
ISO 400
f2.8
[trivia: image was resized to 640, downsampled to 72PPI, sharpened, then jpeged]
Looks fairly good. Unfortunately I was running out of sun as it had just set when I took this so I did not get any other good ones from the first run.
I did get a chance to compare with D60. Same lens. At same settings - way too dark. I had to go to 20 secs, ISO 800 and 1.4 to get to the same level as the 10D at the above settings. Same target, but different then one above. Most interesting, confirms that at least the ir filter on the sensor is different if not the sensor itself.
I also suspect that tomorrow when I play with it again I will need to put a UV filter over the Hoya filter as some of the UV seemed to leak through outside. Could be my imagination though, but the blue channel was brighter then the green. In any case, 10D work for limited IR against still life. D60 pretty useless.
On to the other topic.
Also received my 1.4x extender. Much better then 2x from first looks. Interesting trick. Put 1.4 behind 2x on 100-400L. Was not sure if it would work, but it fit and it focused (manually of course, which means I was off a bit as usual, plus the 2x is not very good in my opinion. However, It did get me closer to the target then just the 2x alone, so not sure if it multiples correctly, but it seems to work out as a cheap 1120mm lens with the 1.6x crop factor that makes a 1792 equivilant telescope. The below link should have all three images.
http://www.longwatcher.com/camera_test.html
In fairness, the aperture and shutter speed changed between shots, so these are probably not good images for seeing actual quality, just telephoto zoom scale. All three are 1-to-1 crops (downsampled to 72PPI, then jpeged, but not sharpened)
In short interesting. Which I could have afforded to get the other 2 IR filters I was looking at to see what those do. Maybe next time. At least I get to play with them this weekend.
jpeged example at:
http://www.longwatcher.com/images/CRW_2939-IR%20test.jpg
I used my 50/1.4
4 secs
ISO 400
f2.8
[trivia: image was resized to 640, downsampled to 72PPI, sharpened, then jpeged]
Looks fairly good. Unfortunately I was running out of sun as it had just set when I took this so I did not get any other good ones from the first run.
I did get a chance to compare with D60. Same lens. At same settings - way too dark. I had to go to 20 secs, ISO 800 and 1.4 to get to the same level as the 10D at the above settings. Same target, but different then one above. Most interesting, confirms that at least the ir filter on the sensor is different if not the sensor itself.
I also suspect that tomorrow when I play with it again I will need to put a UV filter over the Hoya filter as some of the UV seemed to leak through outside. Could be my imagination though, but the blue channel was brighter then the green. In any case, 10D work for limited IR against still life. D60 pretty useless.
On to the other topic.
Also received my 1.4x extender. Much better then 2x from first looks. Interesting trick. Put 1.4 behind 2x on 100-400L. Was not sure if it would work, but it fit and it focused (manually of course, which means I was off a bit as usual, plus the 2x is not very good in my opinion. However, It did get me closer to the target then just the 2x alone, so not sure if it multiples correctly, but it seems to work out as a cheap 1120mm lens with the 1.6x crop factor that makes a 1792 equivilant telescope. The below link should have all three images.
http://www.longwatcher.com/camera_test.html
In fairness, the aperture and shutter speed changed between shots, so these are probably not good images for seeing actual quality, just telephoto zoom scale. All three are 1-to-1 crops (downsampled to 72PPI, then jpeged, but not sharpened)
In short interesting. Which I could have afforded to get the other 2 IR filters I was looking at to see what those do. Maybe next time. At least I get to play with them this weekend.