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8mm film scanner / How many pictures possible per ten seconds?

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Online reyalp

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Re: USB remote and focusing just once
« Reply #60 on: 27 / November / 2015, 18:40:56 »
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Quote from: waterwingz on 27 / November / 2015, 18:30:33
Quote from: reyalp on 27 / November / 2015, 17:16:11
According to canon specs, the ixus55 was capable of ~2.1 FPS in continuous mode:
True.  But continuous mode is not very useful if you want to control when each shot actually happens. Unless you are using a script sophisticated enough to use RAW hooks of course. 
As I've said before, on some cameras, the hold half/click full approach gives essentially the same shooting rate as continuous. This includes the digic II based a540, so it would be unsurprising if ixus55 were similar.
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Do we know for sure that continuous mode goes past the RAW hook in every camera?
No, but if it doesn't many things will be broken. I suspect the raw hook works on most ports in continuous mode. IIRC the problem with the special burst modes was that raw data was not available, not that the hook wasn't reached.

Also, controlling shooting in continuous is better done with the shutter (aka usb remote) hook than the raw hook. This again should work most ports.
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Offline heikkiH

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Re: USB remote and focusing just once
« Reply #61 on: 28 / November / 2015, 04:57:33 »
Gentlemen, let me assure you this thing is as close to perfect as it can get. As soon as I try the updated half-press script with the good timing, and add replacement power for the ten-year-old battery, I will be able to shoot from frame 1 to frame 5000 no problem.

Let me take this opportunity to thank you for all your help: without CDHK, I'd still be wandering in the dark and trying to fiddle with various other things I had in mind, but now that I have seen the quality of the images I can get this way, I don't think I could get it better than this.

I do understand I could work with a DSLR and Magic Lantern (I have a D1000) but the starting point of this project was to work with what I happened to have on my desk, and to my great surprise, I am able to pull it through.

But, as I said, only with this site and your generous time. I always thought battle-fields.com was the best forum - you have outclassed even that.

Cheers,

-h.
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Offline heikkiH

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Re: USB remote and focusing just once
« Reply #62 on: 01 / December / 2015, 11:40:36 »
Hi all,

I think I can report success. Today, using a 1GB card, the system captured 3,208 images. I forgot to turn on Aflock, so I have a few (<10) fuzzy images in the set, but I rummaged through my stores and found a 2GB card (my Ixus balks at 4). So, I can grab 6,000 images in one run. That is more than I need.

I did test the latest version of the 8mmAflock.lua, but it seems to interefere with the actual shooting; if it is loaded, the system tells me it shoots but doesn't. It does maintain aflock beautifully.

Man, I feel happy. For an English major (I am not an engineer), this has been a real journey, but the end is in sight. It is very much due to the hard work of you guys who gave us CHDK, so thank you once more.

cheers,

Heikki
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Offline waterwingz

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Re: USB remote and focusing just once
« Reply #63 on: 01 / December / 2015, 13:33:34 »

Quote from: heikkiH on 01 / December / 2015, 11:40:36
I did test the latest version of the 8mmAflock.lua, but it seems to interefere with the actual shooting; if it is loaded, the system tells me it shoots but doesn't. It does maintain aflock beautifully.
This is most likely caused by the click("shoot_full") statement not holding the shutter button down long enough for your older camera.   It works on my newer camera however.   If you would like to make one more try using the script I can update it to hold the shutter button until it sees the new image file created.
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Ported :   A1200    SD940   G10    Powershot N    G16
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Offline heikkiH

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Re: USB remote and focusing just once
« Reply #64 on: 02 / December / 2015, 01:20:00 »
That would be perfect, if I can request one more effort from you after all the help. I will be in the lab on Thursday next time.
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Offline waterwingz

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Re: USB remote and focusing just once
« Reply #65 on: 02 / December / 2015, 19:54:46 »
Quote from: heikkiH on 02 / December / 2015, 01:20:00
That would be perfect, if I can request one more effort from you after all the help. I will be in the lab on Thursday next time.
version 3 attached

Edit : corrected bug in script reported https://chdk.setepontos.com/index.php?topic=13079.msg132073#msg132073]here
« Last Edit: 06 / April / 2017, 02:00:46 by waterwingz »
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Ported :   A1200    SD940   G10    Powershot N    G16
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Offline heikkiH

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Re: USB remote and focusing just once
« Reply #66 on: 03 / December / 2015, 05:29:32 »
Hi again,

V3 is working beautifully!It maintains the focus and shoots and tells me what's happening.

Onle slight problem is around: it takes double images every once and again, in the attached video it happens between 190 and 192.

That's probably a thing that can be adjusted for in the delays I guess?

See
Thanks again!
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Offline waterwingz

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Re: USB remote and focusing just once
« Reply #67 on: 03 / December / 2015, 11:11:38 »
Quote from: heikkiH on 03 / December / 2015, 05:29:32
One slight problem is around: it takes double images every once and again, in the attached video it happens between 190 and 192.
Thanks for posting the video - it really helps show what is happening.  Can you tell if there are actually two images saved to the SD card when this happens?

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That's probably a thing that can be adjusted for in the delays I guess?
There isn't really any timing to adjust in the script.  It waits for the USB power to go on and then off, and then it shoots, and then it starts waiting again.  If the actuator / microswitch combination you are using to trigger the +5V line to the USB connector "bounces" or "chatters" then I guess it's possible that the new script is fast enough that it picks up a second trigger on the same frame occasionally.  Debouncing a switch (especially a form C contact like you have) is easy to do in hardware.  Doing the same in software usually results in slowing down the response rate somewhat.   That might be okay with your mechanism but will be hard to tune remotely if this is actually the problem.

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Ported :   A1200    SD940   G10    Powershot N    G16
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Offline heikkiH

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Re: USB remote and focusing just once
« Reply #68 on: 03 / December / 2015, 11:33:08 »
Okay... if I am reading you right, I don't have to send 500 ms from Arduino to trigger, just a pulse? That way I could adjust the mechanics better, and it'd even add speed to the cycle. I'll try it again when I go to the office next, and in any case, weeding out a few doubles is easy.

Thanks again :)
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Offline waterwingz

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Re: USB remote and focusing just once
« Reply #69 on: 03 / December / 2015, 12:29:07 »
Quote from: heikkiH on 03 / December / 2015, 11:33:08
Okay... if I am reading you right, I don't have to send 500 ms from Arduino to trigger, just a pulse? That way I could adjust the mechanics better, and it'd even add speed to the cycle.
I'd suggest cutting the 500 mSec down to 50 mSec. The standard USB remote code will reliably detect pulses as short as 20 mSec.   There is a way to go faster but I don't think it's necessary here.
« Last Edit: 03 / December / 2015, 17:29:36 by waterwingz »
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Ported :   A1200    SD940   G10    Powershot N    G16
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