[Christopher M.W.T]

Just got emailed it and thought it'd test it out with my K7.

ALl in all very impressed, I took a 6400 shot in broad daylight in Av mode and +0.7 ev comp in RAW.

I think its unfair the bad HIGH ISO noise rap the K7 gets, although I never have a reason to shoot this high, personally I seldom go over 1000 iso.

I haven't applied any sharpening other than the default.


No extra NR applied.


6400 NN NR applied

[eagle]

Glad that you like the profiles overall.

ISO 6400 on the K7 is bad IMO, and would have to be desperate before I used it myself.
I do a bit of low light stuff, but usually at no more than 3200. As they clean up well, and leave plenty of detail.

[dosdan]

IS0 6400 +0.7EV is ISO 10000

[Christopher M.W.T]

IS0 6400 +0.7EV is ISO 10000

Actually what I meant to say is that I shot in Av but used the EV button on the camera to compensate to push the histogram more to the right.

[dosdan]

Actually what I meant to say is that I shot in Av but used the EV button on the camera to compensate to push the histogram more to the right.

Whether you do it in camera, or in PP, ISO 6400 +0.7EV = 1SO 10000.

[RawheaD]

Whether you do it in camera, or in PP, ISO 6400 +0.7EV = 1SO 10000.

I thought changing the EV in Av mode just changes the shutter speed. How will it change the sensor sensitivity?

[eagle]

Try it. If you shoot at ISO 3200 +0.7EV, Noise Ninja will auto match with, I'm guessing, the ISO 5000 profile.

At 6400, with +0.7EV, it's got nowhere to go.

[Christopher M.W.T]

I thought changing the EV in Av mode just changes the shutter speed. How will it change the sensor sensitivity?

Yer I don't understand it either.

[dosdan]

You are shooting with 1/500s, F5.6, ISO 100

Use the EV calculator here: Exposure: Exposure: Glossary: Learn: Digital Photography Review

The EV value is 14 EV. Let's assume the photo is well exposed.

Now you apply an EV comp of +1 EV. That increases the shutter speed from the metering's suggested 1/500s to 1/250s.

The EV value for that is 13 EV.

The photo should now be one stopped overexposed, because (b) you've doubled the shutter speed with the other settings the same, including illumination level, so twice as much light is accepted; (b) You've used exp. values for a 13 EV situation, when there was actually a 14 EV level of illumination.

Now return to 1/500s, F5.6, ISO 100 and increase the ISO to ISO 200. Again the calculator shows 13 EV. So doubling the ISO has made the camera 1 stop/1 EV more sensitive i.e. it will correctly exposure at 13 EV and be 1 stop overexposed at 14 EV.

The corollary of this is that increasing the EV comp +1 EV is the same as boosting the ISO from ISO 100 to ISO 200. So ISO 6400 +1 EV is the same as ISO 12800, while ISO 6400 + 0.7 EV is the same as ISO 10000.

Dan.

[dosdan]

Try it. If you shoot at ISO 3200 +0.7EV, Noise Ninja will auto match with, I'm guessing, the ISO 5000 profile.

At 6400, with +0.7EV, it's got nowhere to go.

Maybe not on the camera, but you can still apply +0.7 EV in PP in the RAW converter. Which, as discussed in the message above, would be the same as using ISO 10000 in the camera, if it was available.

Increasing ISO in the camera is analogue amplification of the sensor's output. Increasing exposure (EV) in PP is digital amplification. The result should be the same.

Dan.

[eagle]

Maybe not on the camera, but you can still apply +0.7 EV in PP in the RAW converter. Which, as discussed in the message above, would be the same as using ISO 10000 in the camera, if it was available.

Increasing ISO in the camera is analogue (I think) amplification of the sensor's output. Increasing Exposuure (EV) in PP is digital amplification. The result should be the same.

Dan.

My point is, I didn't create a Noise Ninja Profile for this situation. (ISO 6400 +0.7EV)

I created profiles for 1/3 ISO steps, with an extra profile at 6400 +0.3EV

[dosdan]

My point is, I didn't create a Noise Ninja Profile for this situation. (ISO 6400 +0.7EV)

I created profiles for 1/3 ISO steps, with an extra profile at 6400 +0.3EV

So that's designed for ISO 8000.

[Christopher M.W.T]

You are shooting with 1/500s, F5.6, ISO 100

Use the EV calculator here: Exposure: Exposure: Glossary: Learn: Digital Photography Review

The EV value is 14 EV. Let's assume the photo is well exposed.

Now you apply an EV comp of +1 EV. That increases the shutter speed from the metering's suggested 1/500s to 1/250s.

The EV value for that is 13 EV.

The photo should now be one stopped overexposed, because (b) you've doubled the shutter speed with the other settings the same, including illumination level, so twice as much light is accepted; (b) You've used exp. values for a 13 EV situation, when there was actually a 14 EV level of illumination.

Now return to 1/500s, F5.6, ISO 100 and increase the ISO to ISO 200. Again the calculator shows 13 EV. So doubling the ISO has made the camera 1 stop/1 EV more sensitive i.e. it will correctly exposure at 13 EV and be 1 stop overexposed at 14 EV.

The corollary of this is that increasing the EV comp +1 EV is the same as boosting the ISO from ISO 100 to ISO 200. So ISO 6400 +1 EV is the same as ISO 12800, while ISO 6400 + 0.7 EV is the same as ISO 10000.

Dan.

I get you now,

Thanks for the explanation

[Christopher M.W.T]

Either way the point of this post is that the K7 is quite capable of usable 6400 ISO results...

[dosdan]

I get you now,

Thanks for the explanation

You're welcome.

Just remember, there is no such thing as a free lunch. That's why when I increase EV in PP using SikyPix Pro, say +1 EV, with a marginal ISO 1600 RAW image (I don't shoot above ISO 1600 on the K20D or ISO 800 on the K100D Super), I expect a very noisy outcome because it's the same as shooting in the camera at ISO 3200 (leaving aside the issue of sensor-level NR).

Dan.