G1X + others ISO override issues (was Re: rawopint.lua)

Made 4 runs on SX50, each 10 shoots
1) Continuous Mode, Target ISO 100
2) Quick Mode, Target ISO 100
3) Quick Mode, Target ISO 101
4) Quick Mode, Target ISO 200

It would be interesting to know if it keeps happening when the script increases ISO, or if you set target sv to say, 101 instead of 100.

It looks like the difference is always 1…

I wouldn't expect a 1 unit mismatch to cause problems, but it's odd.

1 step not…
But what I see is a jump in meter from +32 (First picture) to minus -24 (second picture) and then it goes close to 0. This only happens in Quick mode. But maybe it has nothing to do with the ISO setting.
I noticed that in the combined script (izoomer+rawopint). Every time I leave ‘half press’, change zoom and set ‘half press’ I have these jumps. My guess was it has something to do with the ISO setting.

Quote from: reyalp on 28 / April / 2018, 00:09:28

It would be interesting to know if it keeps happening when the script increases ISO, or if you set target sv to say, 101 instead of 100.

It looks like the difference is always 1…

Same on G1x…

But what I see is a jump in meter from +32 (First picture) to minus -24 (second picture) and then it goes close to 0. This only happens in Quick mode. But maybe it has nothing to do with the ISO setting.
I noticed that in the combined script (izoomer+rawopint). Every time I leave ‘half press’, change zoom and set ‘half press’ I have these jumps. My guess was it has something to do with the ISO setting.

This problem is not happening on G1x.

For the SX50, this problem is caused by the ND filter. If I remove the following code, then everything is ok. The jumps have nothing to do with the ISO settings.

if get_nd_present() == 1 then
if self.nd_state then
set_nd_filter(1)
set_prop(props.AV,get_prop(props.MIN_AV)+self.nd_value)
else
set_nd_filter(2)
set_prop(props.AV,get_prop(props.MIN_AV))
end
elseif get_nd_present() == 2 then
-- ND + iris
if self.nd_state then
set_nd_filter(1)
else
set_nd_filter(2)
end
end


So the only question is, why are the differences from 1 between the ISO values only in quick mode and not in continuous mode.

For the SX50, this problem is caused by the ND filter. If I remove the following code, then everything is ok.

SX50 doesn't have an ND filter so you should just set the ND Tv value to 0.

so you should just set the ND Tv value to 0.

But I did that, in the logfile above ND Tv and ND is set to 0.

But I did that, in the logfile above ND Tv and ND is set to 0.

You're right, it's a bug. I'll look into it.

Quote from: c_joerg on 30 / April / 2018, 01:48:16

But I did that, in the logfile above ND Tv and ND is set to 0.

You're right, it's a bug. I'll look into it.

IIRC, the setting of the ND filter was already confusing with the SX50
https://chdk.setepontos.com/index.php?topic=13228.0  Reply #5