Build 48: optical zoom in video - AllBest's Builds - CHDK Forum  

Build 48: optical zoom in video

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Build 48: optical zoom in video
« on: 27 / March / 2008, 15:34:06 »
first of all, thanks indeed for your work

I have been trying this new feature (A630 and Ixus70_SD1000) and it works... but if digital zoom is enabled (Standard) and I use it, then I won't be able to zoom out

Re: Build 48: optical zoom in video
« Reply #1 on: 29 / March / 2008, 19:15:43 »
I can confirm that using digital zoom in a movie stop lens at maximum telephoto in my A570is.

When lens reach max extension and digital zoom begin, the lens won't retract.



Offline PhyrePhoX

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Re: Build 48: optical zoom in video
« Reply #2 on: 30 / March / 2008, 03:07:17 »
they will probably a fix for that, however as a workaround: don't use digital zoom. what's it good for anyways?


Offline PG

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Re: Build 48: optical zoom in video
« Reply #3 on: 04 / April / 2008, 04:39:35 »
Confirming this bug on A710 IS.


Offline hotvedt

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Re: Build 48: optical zoom in video
« Reply #4 on: 07 / April / 2008, 22:02:15 »
...and same on the A540.
About not using the digital zoom; it is not so easy. Also, it cannot(?) be turned of in the menu, so it affects

This is my first post in this forum, BIG thanks to all the folks behind the CHDK.

Re: Build 48: optical zoom in video
« Reply #5 on: 08 / April / 2008, 03:54:47 »
« Last Edit: 22 / April / 2008, 16:49:26 by Barney Fife »
[acseven/admin commented out: please refrain from more direct offensive language to any user. FW complaints to me] I felt it imperative to withdraw my TOTAL participation. Nobody has my permission, nor the right, to reinstate MY posts. Make-do with my quoted text in others' replies only. Bye

Re: Build 48: optical zoom in video
« Reply #6 on: 09 / April / 2008, 17:38:09 »
Besides the arguments mentioned above, digital zoom in video is a good thing because the video resolution of most cameras is lower than the ccd/cmos. Therefore there are some cases thinkable in which you would wish to choose what pixels you going to use. Those in the middle, or those equally spread over the whole ccd area.
« Last Edit: 11 / April / 2008, 06:23:18 by borisbergman »


Offline dvc

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Re: Build 48: optical zoom in video
« Reply #7 on: 17 / April / 2008, 01:03:02 »
I can also confirm this behavior w A570 101a & build 50. Annoying!

As per digital zoom... very useful in movie mode... I certainly don't want to crop avi files! Also, combined optical+digital zoom vastly increases zoom range. VERY desireable!

(also, as an author noted, even for stills, digital zoom is very useful for finding/composing potential shots... even if you decided zoom out and crop in PC later ... as I do! Also, for transient potential shots outside of optical zoom range, your ability to see and capture is greatly enhanced, even if quality is compromised.)

BTW, Great product guys! I just dl'd and installed and am now playing with settings. Main feature I was trying to find was RAW, after spending countless hours trying to save some important shots in PSP & Elements from a recent disney world trip. So I'm VERY VERY happy :) :)

If anyone's interested, I'm uploading shots from that trip (mostly) to: Photo Gallery by David Van Camp. Hopefully, I'll be adding CHDK-aided shots soon :)


Re: Build 48: optical zoom in video
« Reply #8 on: 21 / April / 2008, 15:55:32 »
Curious: on the cameras, such as the a710, where chdk enables optical zoom in video, does the camera automatically refocus in video? I once assumed that all cameras perform continuous auto-focusing in video mode, as seen on my old S2is, but didn't appear to be the case on my new SD870. So is chdk able to enable both video optical zoom and enable continuous auto-focusing, or does the camera needs to already support continuous auto-focusing?


Offline vit40

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Re: Build 48: optical zoom in video
« Reply #9 on: 21 / April / 2008, 17:30:17 »
On my A620, after change of zoom, camera sets the focus to the same distance as before (focus point is disturbed by zooming, so refocusing is needed) . I suppose it's done by the CHDK, because versions up to #37 didn't refocus (I think evawr and allbest can say more). It doesn't set the focus to the new subject. I suppose it's the same on A720

On S3, zooming is possible even without CHDK and slow continuous AF works during movie recording, like on the camcorder (unless you lock the focus with MF button)


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