Swap: K3 for K5IIs +Da35mm
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Posted 21/05/2014 - 19:26
Could this be anything to do with a different response to UV (which is presumably going to show up more at altitude)?
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Posted 21/05/2014 - 19:35
PM's all replied to.
David, that's what I'm thinking. I've tried 3 different UV filters and they haven't made an iota of difference. I'm also sometimes getting a bit of smearing on greens from altitude, and on the ground I get none at all. It's all very strange.
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David, that's what I'm thinking. I've tried 3 different UV filters and they haven't made an iota of difference. I'm also sometimes getting a bit of smearing on greens from altitude, and on the ground I get none at all. It's all very strange.
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Posted 23/05/2014 - 09:56
Due to some information I've discovered/been sent I am going to persevere with the K3 for a while. I'll give it until I'm back in the UK in July, and if I still can't get it doing what I want I'll sell it then.
Apologies for wasting anyone's time.
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Apologies for wasting anyone's time.
Flurble
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Posted 24/05/2014 - 01:37
David, I'm still trying to get my head round some of it, and will post more detail when I have. I think I'm dealing with effects caused by shooting in a high UV environment, possibly aggravated by prismatic effects from the aircraft windows. I also think the effects may be worse with a higher pixel density, ie 24mp as opposed to 16mp on the same sized sensor.
An example of the stuff I'm trying to work out is here, the link provided by someone on another site (Z). Interestingly, this paper was all based on experiments with a K5. The findings here are mainly to do with low-key scenes, while I am dealing with low contrast (very low in a lot of cases), often with a very low dynamic range (if no sky is involved).
I'm going to experiment with using different white balances (even ridiculous ones) to see if a) I get better focus accuracy, and b) if a different WB might actually lessen the green smearing I sometimes get. However, my experiences in IR lead me to think I probably need a UV filter with a cut-off of at least 450nm instead of 420nm. A standard UV (420nm) filter makes no difference at all. I've not been able to find such a filter anywhere, probably as they will affect colour reproduction. My 665nm IR camera is affected very much less by atmospheric haze, and also achieves better focus than both my K5 and K3. My GR seems unaffected. My experiments in processing 665nm images makes me think I can deal with any colour shifts presented by images shot above 450 or even 470nm.
If anyone fancies going through the article and letting me know their thoughts, I'd be very interested to hear them. Meanwhile, I also have some other esoteric stuff to sift through and then if anyone's interested I'll post more stuff. Also, if anyone knows where I could find a filter that blocks everything below 450-470nm, I'd be extremely grateful for the info.
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An example of the stuff I'm trying to work out is here, the link provided by someone on another site (Z). Interestingly, this paper was all based on experiments with a K5. The findings here are mainly to do with low-key scenes, while I am dealing with low contrast (very low in a lot of cases), often with a very low dynamic range (if no sky is involved).
I'm going to experiment with using different white balances (even ridiculous ones) to see if a) I get better focus accuracy, and b) if a different WB might actually lessen the green smearing I sometimes get. However, my experiences in IR lead me to think I probably need a UV filter with a cut-off of at least 450nm instead of 420nm. A standard UV (420nm) filter makes no difference at all. I've not been able to find such a filter anywhere, probably as they will affect colour reproduction. My 665nm IR camera is affected very much less by atmospheric haze, and also achieves better focus than both my K5 and K3. My GR seems unaffected. My experiments in processing 665nm images makes me think I can deal with any colour shifts presented by images shot above 450 or even 470nm.
If anyone fancies going through the article and letting me know their thoughts, I'd be very interested to hear them. Meanwhile, I also have some other esoteric stuff to sift through and then if anyone's interested I'll post more stuff. Also, if anyone knows where I could find a filter that blocks everything below 450-470nm, I'd be extremely grateful for the info.
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Last Edited by aliengrove on 24/05/2014 - 01:48
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Posted 24/05/2014 - 02:26
aliengrove wrote:
Also, if anyone knows where I could find a filter that blocks everything below 450-470nm, I'd be extremely grateful for the info.
Also, if anyone knows where I could find a filter that blocks everything below 450-470nm, I'd be extremely grateful for the info.
Wratten #2, #3 or #4 (the yellow ones) would normally be used for aero film shots, god knows what they'll do on digital ...
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Posted 24/05/2014 - 06:06
Those filters are for black and white film
Ken
“We must avoid however, snapping away, shooting quickly and without thought, overloading ourselves with unnecessary images that clutter our memory and diminish the clarity of the whole.” - Henri Cartier-Bresson -
Ken
“We must avoid however, snapping away, shooting quickly and without thought, overloading ourselves with unnecessary images that clutter our memory and diminish the clarity of the whole.” - Henri Cartier-Bresson -
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aliengrove
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Here, there, everywhere
On the ground, it's a fantastic camera, by far the best camera I've owned. For aerial shots, however, the RAW files can't stand the extreme processing needed to get rid of excessive haze, the distortion of the windows shows up more, and for some reason I can't work out, it's very difficult to get the WB correct. On the ground, WB is never a problem, and I can't work out why it should struggle so much with WB from shots taken at altitude.
I've gone back to using my K5 for most aerial shots, but I really need a camera with no AA filter, as proved by comparisons between my GR and K5. The camera is a couple of months old, boxed, in excellent condition, with screen protectors fitted. Shutter count is around 1500. It was bought from a reputable dealer in Hong Kong (I've bought a lot of gear from them, including my 15mm Ltd and Ricoh GR), so doesn't have the two year warranty you get from a Pro dealer in the UK.
I'd be interested in swapping the camera for a K5IIs plus a lens, preferably a DA 35mm. Anyone interested?
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