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how to focus the camera before shooting with a usb remote?

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how to focus the camera before shooting with a usb remote?
« on: 21 / March / 2012, 13:45:13 »
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How do I get the camera to focus before shooting with a usb remote? Is it sufficient that I do it manually with a half-way shutter press before pressing the trigger with the remote cable? Or is this something that should be added in the script?

(please don't hate me if this question is totally blond. I really don't understand much about cameras  :blink:)

Re: how to focus the camera before shooting with a usb remote?
« Reply #1 on: 21 / March / 2012, 14:43:50 »
Focus and exposure adjustments are made when the camera is in the "half press" state. 

With the normal shutter button,  you press it approximately half way and (usually) wait for a beep to tell you the focus & exposure are set.  Then you press the button all the way to take the picture.

With a USB remote,  you can do the same basic thing with just the remote button using a slightly different sequence, depending on what kind of remote you have and how you have setup your remote menu.  There is a chart that explains the option s here :  USB remote timing diagram
« Last Edit: 21 / March / 2012, 14:45:32 by waterwingz »
Ported :   A1200    SD940   G10    Powershot N    G16

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Offline SkyWalker9

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Re: how to focus the camera before shooting with a usb remote?
« Reply #2 on: 22 / March / 2012, 21:55:24 »
How do I get the camera to focus before shooting with a usb remote? Is it sufficient that I do it manually with a half-way shutter press before pressing the trigger with the remote cable? Or is this something that should be added in the script?
The link that @waterwingz provided may seem a bit complicated if you are new to using a USB remote with CHDK so I'll add a little more info. Manually pressing the shutter button half-way before starting a script will only work if you can "lock" the focus before starting the script such as with some of the cameras that have a manual focus (MF) capability and the script doesn't change the condition before taking a shot. Since you mentioned you are using a script, it is simple to incorporate a statement (if not already present) that performs a "half-way shutter press". Many of the scripts available on the CHDK site have the statement already incorporated. For example, if you are using a BAS script, the statement would be a press "shoot_half"; in a LUA script the statement would be a press("shoot_half"). Hope this helps!

Re: how to focus the camera before shooting with a usb remote?
« Reply #3 on: 22 / March / 2012, 22:26:09 »
The link that @waterwingz provided may seem a bit complicated if you are new to using a USB remote with CHDK so I'll add a little more info. Manually pressing the shutter button half-way before starting a script will only work if you can "lock" the focus before starting the script such as with some of the cameras that have a manual focus (MF) capability and the script doesn't change the condition before taking a shot. Since you mentioned you are using a script, it is simple to incorporate a statement (if not already present) that performs a "half-way shutter press". Many of the scripts available on the CHDK site have the statement already incorporated. For example, if you are using a BAS script, the statement would be a press "shoot_half"; in a LUA script the statement would be a press("shoot_half"). Hope this helps!
Note that skywalker9's detailed description is for using usb remote via a script.   You can do the "half press" & "full press" sequence without any script if you configure your USB remote appropriately in the CHDK menus.
Ported :   A1200    SD940   G10    Powershot N    G16


 

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