IXUS800(SD700) inside the lens images. There is a ND filter! - page 4 - General Discussion and Assistance - CHDK Forum  

IXUS800(SD700) inside the lens images. There is a ND filter!

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Re: IXUS800(SD700) inside the lens images. There is a ND filter!
« Reply #30 on: 15 / February / 2008, 11:32:28 »
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Great! And did you find the broken part of the lens?
Then you oculd try to reassemble the camera  :lol

Several parts of the lens gear are disrupted, probably due to brute force impact. Pointless to re-assemble the lens.

No - I will try to frankenstein something!  :D

Any ideas?
« Last Edit: 15 / February / 2008, 11:44:27 by nirschi »

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Offline kwf

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Re: IXUS800(SD700) inside the lens images. There is a ND filter!
« Reply #31 on: 15 / February / 2008, 12:07:40 »

Several parts of the lens gear are disrupted, probably due to brute force impact. Pointless to re-assemble the lens.

No - I will try to frankenstein something!  :D

Any ideas?

Well you could try to trick the camera so it runs with the broken lens and put an other lens in front of it, old telescope, cheap old dslr lens, or old binocoluars. Regardless which you use, with the tiny sensor, all of them will probably result in pretty long tele lenses :)
« Last Edit: 15 / February / 2008, 12:09:43 by kwf »

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Offline jetzt

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Re: IXUS800(SD700) inside the lens images. There is a ND filter!
« Reply #32 on: 15 / February / 2008, 15:48:28 »
On an a710 I have no fireworks mode.
Is it possible that there is one?
Maybe that is something which causes the amp glow on long exposures?(Sounds stupid when thinking about it.)

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Offline GrAnd

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Re: IXUS800(SD700) inside the lens images. There is a ND filter!
« Reply #33 on: 15 / February / 2008, 15:57:03 »
I do not think that Canon inserts ND filter into any lenses and then just hides that fact from users. The ND filter takes a room and increases lenses cost.
CHDK Developer.


Re: IXUS800(SD700) inside the lens images. There is a ND filter!
« Reply #34 on: 15 / February / 2008, 17:11:09 »
There is a non-destructive way to find it out:
call PutInNdFilter() in shooting_expo_param_override().
when image is darker than normal, check whether DOF changes.
« Last Edit: 15 / February / 2008, 22:50:35 by nirschi »

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Offline PhyrePhoX

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Re: IXUS800(SD700) inside the lens images. There is a ND filter!
« Reply #35 on: 15 / February / 2008, 17:37:29 »
where exactly do i activate this, do i haver to add it somewhere in sourcecode?

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Offline brainwash

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Re: IXUS800(SD700) inside the lens images. There is a ND filter!
« Reply #36 on: 15 / February / 2008, 18:30:38 »
dont they all have gyros, because of orientation?

no. orientationsensor != gyro. Gyro sensors measure the angular velocity.

I think orientation sensor used in cameras is just a switch, kind of mercury switch (nowadays  without mercury).

Exactly, gyros (or what they're called) are used to perform IS. There are integrated solutions (all-on-a-chip) but I think the perpendicular one is used because of the 'panning' mode of IS.
Orientation is just a mechanical switch, a ball on grooves or something.  If we are to stick to the topic, listen for a 'clunk' when rotating the camera.
Maybe someone should make a picture of possible noises :)
While at it maybe someone could figure out why my car air conditioning makes some clunks even when turned off :)

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Offline kwf

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Re: IXUS800(SD700) inside the lens images. There is a ND filter!
« Reply #37 on: 15 / February / 2008, 18:52:04 »
There is a non-destructive way to find it out:
call PutInNdFilter() in shooting_expo_param_override().
when image is darker than normal, check whether DOF changes.

I also had my doubts... but i tried it ... and am now convinced it is just apertures (at least for the a570is).

About noises: there is a noise, different from shutter, but i believe thats the shoot-only IS ... disappears when you disable it.

Btw. can you show us some details one the lens shifting IS mechanism :)
« Last Edit: 15 / February / 2008, 19:02:05 by kwf »


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Offline kwf

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Re: IXUS800(SD700) inside the lens images. There is a ND filter!
« Reply #38 on: 15 / February / 2008, 19:00:43 »
Exactly, gyros (or what they're called) are used to perform IS. There are integrated solutions (all-on-a-chip) but I think the perpendicular one is used because of the 'panning' mode of IS.
Orientation is just a mechanical switch, a ball on grooves or something.  If we are to stick to the topic, listen for a 'clunk' when rotating the camera.
Nothing todo with panning mode, its just that there are single axis gyroscopes and dual-axis ones, but you can read out individual axis for both of them (and have to do that). Btw. my A-series cameras makes so much noises while rotating, its a bit complicated which one is the orientation switch >:)


Re: IXUS800(SD700) inside the lens images. There is a ND filter!
« Reply #39 on: 15 / February / 2008, 22:54:01 »
Quote
There is a non-destructive way to find it out:
call PutInNdFilter() in shooting_expo_param_override().
when image is darker than normal, check whether DOF changes.

What I forgot: Use a tripod and compensate the loss of brightness to compare images. The darker image always looks sharper. Me and AllBest ran into the same trap when verifying the presence of the ND filter on the IXUS800.

Quote
where exactly do i activate this, do i haver to add it somewhere in sourcecode?

Add it to platform/generic/shooting.c: shooting_expo_param_override().
I would use two SD cards, one with and the other without the call to PutInNdFilter() for the quick check.

But better ask one of our Gurus. I'm fitting more into Barney's category: I used the code off of GrAnd's branch but my edits are causing errors!   :D

« Last Edit: 15 / February / 2008, 23:06:47 by nirschi »

 

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