--- In StereoDataMaker@yahoogroups.com, "David Sykes"
<killspammers2@...> wrote:

> Are you in 'sync' mode ?
Yes.

> The word 'Synch' should be displayed at the top of the screen.
Confirmed.

> Are you using the simple remote script or Synch.bas ?
Used synch.bas.

> You should be using synch.bas.
Patting self on back.

-Joel

I'm curious... if the voltage is applied across the two USB ports with
the switch, but without SDM installed, does anything happen?

Mike Galazin

Joel wrote:

> the shutters are only triggered on button-press, not button-release.

Are you in 'sync' mode ?

The word 'Synch' should be displayed at the top of the screen.

Are you using the simple remote script or Synch.bas ?

You should be using synch.bas.


David

6.8 volts may be too high and could damage the cameras USB ports a
simple way to bring the voltage down is to connect a diode in line each
one will drop about .5 volts.
Craig


--- In StereoDataMaker@yahoogroups.com, "velarpinch" <velarpinch@...>
wrote:
>
> I have 6.8v going into each of two A570's, but the shutters are only
> triggered on button-press, not button-release. I imagine my synch
> would be much better if I could remedy this -- any suggestions?
>
> Joel
>

I have 6.8v going into each of two A570's, but the shutters are only
triggered on button-press, not button-release. I imagine my synch
would be much better if I could remedy this -- any suggestions?

Joel

Hello duke,

  > I see the 710 but not the 720 listed.

the 720 is not listed yet, since there are some minor changes to be done
to some scripts - please wait till this will be published.

greetings
Werner


The Duke schrieb:
> I'm currently sitting on the fence (having a difficult time making a
> decision) whether to buy two A570 or two A720 cameras.
>
> As I recall, the A720 had slightly better sync than the A570.  Also, I
> was wondering about the script download on the SDM website.  I see the
> 710 but not the 720 listed.
>
> Reviews say that image quality (especially corner sharpness) is
> slightly better on the A720, but I'm wondering if this will make any
> practical difference.  Most of my 3D shots will be viewed on computer,
> I usually make 4X6" pairs in Stereo Photo Maker, and an occasional 2D
> enlargement up to 8X10.  The longer zoom range on the A720 is the only
> practical advantage that I can see.
>
> Any comments are welcome.  :-)
>
> Duke
>
> */David Sykes <killspammers2@...>/* wrote:
>
>     A new folder has been added to scripts for the A570 and A720 cameras.
>     In future, it may apply to other cameras.
>
>     The Canon software will get or set various camera properties if you
>     provide it with the appropriate 'magic number'.
>
>     The 'magic number' is technically referred to as a 'property-case'.
>
>     If you know the numbers, you can get the value of a property (such as
>     white-balance) using your own script.
>
>     In script 'Synch_L.bas', we have :-
>
>     rem get current flash status
>     get_prop 16 f
>
>     For many cameras, property-case '16' retrieves the flash-status and
>     puts the value in user-variable 'f' :-
>
>     0 = AUTO
>     1 = ON
>     2 = OFF
>
>     On the A570/A720 we use :-
>     get_prop 143 f
>
>     Before we dim the left camera flash, we want to save its current
>     override setting :-
>
>     rem get current flash override value
>     get_prop 28 f
>
>     On the A570/A720 we use :-
>     get_prop 127 f
>
>     Simply use the scripts provided.
>
>     David
>
>
>



___________________________________________________________
Der frühe Vogel fängt den Wurm. Hier gelangen Sie zum neuen Yahoo! Mail:
http://mail.yahoo.de

Ged Burnell wrote:

> I'm a 'LANC and Sony V1' man at the moment and they acheive good sync
> by the LANC controller switching the clocks on at the same time.

but the synch then drifts and may not be good the instant unscripted
action occurs.

>how the two cameras are synchronised with such precision by using SDM.

Shooting an image on detection of button-push provides poor
synchronisation so we let the cameras complete other tasks (such as
preflash) and then divert the Canon shooting task to our code that
continuously monitors the USB connector at VERY high speed.

Hence, detection of button-release is very fast and any difference
between the two cameras detecting it is very small.

The shooting-sequence then continues and if all the settings on both
cameras are the same, we expect the remaining tasks (before taking the
photo) take the same amount of time.

On most cameras tested so far, that is the case.

People are regularly using flash at 1/250 and 1/500 sec shutter-speed.



David

Please excuse if this has been answered before, but I've not found any
explanation on how the two cameras are synchronised with such precision
by using SDM.

I'm a 'LANC and Sony V1' man at the moment and they acheive good sync
by the LANC controller switching the clocks on at the same time.  It
works most of the time, but how does SDM work?  Do the two
cameras 'talk' to each other and adjust their clocks to suit?

Ged

Yes, one test with one pair of cameras.  Not a statistical sampling
by any means.  Will a different pair yield the same sync speeds?
Time will tell.

But I wouldn't sweat over 1/2000 versus 1/40,000 sync results.  I can
be happy with 1/1000, that's plenty for me.  :)

Mike Galazin


======================================

--- In StereoDataMaker@yahoogroups.com, "David Sykes"
<killspammers2@...> wrote:
>
> Duke wrote:
>
> >   I have to plead ignorance and ask what a 'one-off' test is.
>
> Ehhhh .. a test that has only been done once  :-)
>
>
> All the CRT synch tests have only been provided by one tester in all
> cases.
>
> It would be useful for other to repeat the tests to see if they get
> similar results.
>
>
>
> David
>

Someday when you see the distant wildlife (or whatever) and you want
to zoom in as far as possible, the A720's extra zoom will come in
handy.  Those instances may be relatively infrequent, but IMO it's
nice to have when the occasion arises.

Mike Galazin


=======================================
--- In StereoDataMaker@yahoogroups.com, The Duke <matrix222@...>
wrote:
>
> I'm currently sitting on the fence (having a difficult time making
a decision) whether to buy two A570 or two A720 cameras.
>
>   As I recall, the A720 had slightly better sync than the A570.
Also, I was wondering about the script download on the SDM website.
I see the 710 but not the 720 listed.
>
>   Reviews say that image quality (especially corner sharpness) is
slightly better on the A720, but I'm wondering if this will make any
practical difference.  Most of my 3D shots will be viewed on
computer, I usually make 4X6" pairs in Stereo Photo Maker, and an
occasional 2D enlargement up to 8X10.  The longer zoom range on the
A720 is the only practical advantage that I can see.
>
>   Any comments are welcome.  :-)
>
>   Duke

Duke wrote:

>   I have to plead ignorance and ask what a 'one-off' test is.

Ehhhh .. a test that has only been done once  :-)


All the CRT synch tests have only been provided by one tester in all
cases.

It would be useful for other to repeat the tests to see if they get
similar results.



David

JoseCarlos Fernandez wrote:

> Do you know if it could be possible to set Exif data in the pictures
> taken when using SDM?

It is not possible to add information before the picture is saved.

> I am thinking in setting the rotation tag for the camera that is
> rotated 180º

On my A620, I can get that information from the orientation sensor.

Unfortunately, many other cameras do not distinguish between upright
and upside down.

If batch-converting folders of images with SPM, you can specify that
images in one folder are rotated 180 degrees.


By choosing the SDM option to save XML files, all stereo data will be
saved with each image.

I will add orientation to that file.

If information is added to EXIF data by using a utilty programme,
there is a danger that some editing programme may discard that data.

Your XML files will remain as a record of the stereo parameters.

By opening the XML file with a browser (only InternetExplorer
unfortunately with the stereo_data.xsl file that I provide), you will
see your image displayed with all stereo data.

See the website for further details and an example.



David
David

Duke wrote:

> I see the 710 but not the 720 listed.

It is not officially released yet .. you can always ask for it here.

There are owners of A570 and A720 twin-rigs in this Group.

A570 synch about 1/2000 sec (see Masuji's gallery), A720 synch about
1/4000 sec.

These figures are based on one-off tests.

David

Duke wrote:

> I see the 710 but not the 720 listed.

It is not officially released yet .. you can always ask for it here.

There are owners of A570 and A720 twin-rigs in this Group.

A570 synch about 1/2000 sec (see Masuji's gallery), A720 synch about
1/4000 sec.

These figures are based on one-off tests.



David

A new folder has been added to scripts for the A570 and A720 cameras.
In future, it may apply to other cameras.

The Canon software will get or set various camera properties if you
provide it with the appropriate 'magic number'.

The 'magic number' is technically referred to as a 'property-case'.

If you know the numbers, you can get the value of a property (such as
white-balance) using your own script.

In script 'Synch_L.bas', we have :-

rem get current flash status
get_prop 16 f

For many cameras, property-case '16' retrieves the flash-status and
puts the value in user-variable 'f' :-

0 = AUTO
1 = ON
2 = OFF

On the A570/A720 we use :-
get_prop 143 f

Before we dim the left camera flash, we want to save its current
override setting :-

rem get current flash override value
get_prop 28 f

On the A570/A720 we use :-
get_prop 127 f

Simply use the scripts provided.

David

A new folder has been added to scripts for the A570 and A720 cameras.
In future, it may apply to other cameras.

The Canon software will get or set various camera properties if you
provide it with the appropriate 'magic number'.

The 'magic number' is technically referred to as a 'property-case'.

If you know the numbers, you can get the value of a property (such as
white-balance) using your own script.

In script 'Synch_L.bas', we have  :-

rem get current flash status
get_prop 16 f

For many cameras, property-case '16' retrieves the flash-status and
puts the value in user-variable 'f' :-

0 = AUTO
1 = ON
2 = OFF


On the A570/A720 we use :-
get_prop 143 f


Before we dim the left camera flash, we want to save its current
override setting :-

rem get current flash override value
get_prop 28 f

On the A570/A720 we use :-
get_prop 127 f


Simply use the scripts provided.



David

Rick Schneider wrote:

> it is the SD950 IS that has 12 MPx and larger sensor,not the SD1000

> Any plans to do synchro tests on that one...?


This is the page to keep an eye on (assuming it is up-to-date) :-

http://chdk.wikia.com/wiki/For_Developers


The SD950 reference is coloured black meaning no-one has dumped the
firmware (the camera software) yet.

Firmware has to be dumped and then the tedious process of porting to
the basic CHDK has to be done.

After that it is relatively straightforward to port to SDM and test if
USB-remote can be made to work.

If it does, you have to take a chance and buy or borrow two and do the
CRT synch test.


David

Craig wrote:
>
> Iin the "Continuous-shooting synchronised-flash PCB" all 4 pins of the
> usb connector are used, is there any benefit to this or do you get the
> same results from just using power and ground?


Hi Craig.

The connector SV3 on the right-edge of the circuit-board only uses
power and ground.

Two connections are for the left camera and two are for the right camera.

You join the red and black wires of your USB cable there.

These are just logic signals, they do not provide power for the camera.



David

Iin the "Continuous-shooting synchronised-flash PCB" all 4 pins of the
usb connector are used, is there any benefit to this or do you get the
same results from just using power and ground?
Craig

In about a weeks time, we should have the results of synchronisation
tests on the ixus55/SD450 and ixus70/SD1000.

The person who ported the basic CHDK to the the ixus55 learned a lot
from the Ukrainian hackers.


The good news is  .. he is a stereo photographer.

The even better news is .. he is a (quiet) member of Photo3D !


That experience will be invaluable when porting other cameras.



David

--- In StereoDataMaker@yahoogroups.com, "Werner Bloos" <wbloos@...>
wrote:
>
> I added some pictures of my remote for SDM (see Photos on this
group)
> - it's a 3xAA battry holder (inside: 3* 1.2V rechargeable
battreies),
> a switch and mounted USB cables (90cm long) - I have also a right
> angle mini USB adapter to reduce stereobase adapter is only 10mm
wide
> (adds 10mm stereobase)
>
> greetings
> Werner
>
> PS: I will sell this as well:
> - the remote without batteries: EUR 15.-
> - the remote with ONE right angele adapter: EUR 21.-
> - the remote with TWO right angele adapters: EUR: 27.-
> plus shipping worldwide - adapters are not sold separate!
>


Hello Werner,

I want to buy the remote with two r.a.adapters.
Please send payment information.
Oktay

> To prove the script does dim the flash, run script 'dim_flash.bas'

I forgot to mention, all those scripts are in this group folder
'File\Scripts'.


David

When the camera is in Tv mode and we enable flash on BOTH cameras, on
pressing the USB-remote button the preflash fires on both cameras.

Presumably, this allows the cameras to measure white-balance.

On releasing the button, the left camera fires immediately but at -4
stops reduced-power.

After a delay equal to half the shutter-speed, the right flash fires
at full-power.

Script 'Synch_R.bas' assumes a shutter-speed of 1/250 sec.

This is fast for stereo synch but works on the cameras tested so far.

If this gives an unacceptable success-rate you will need to set a
lower shutter-speed.

For this to work, we need to set the correct delay.

1/250 sec = 1000/250 msec = 4 = 40 SDM units of 0.1msec.

We want to delay firing the flash until the middle of the exposure so
we set fine delay to '20'.

There are various parameters in the camera that we need to access such
as flash status (on/off/auto) and flash override value.

As new cameras are introduced, the 'magic numbers' (property-case
values) needed to access these parameters may change and we will need
to determine them.

If the numbers have changed, the camera may hang .. just remove the
batteries.

Post details of your camera model.

To prove the script does dim the flash, run script 'dim_flash.bas' on a
single camera and take photos in a darkish location.

The script will take two images, the second should be darker than the
first.

You can try this even if you do not yet have a twin-rig !


David

I added some pictures of my remote for SDM (see Photos on this group)
- it's a 3xAA battry holder (inside: 3* 1.2V rechargeable battreies),
a switch and mounted USB cables (90cm long) - I have also a right
angle mini USB adapter to reduce stereobase adapter is only 10mm wide
(adds 10mm stereobase)

greetings
Werner

PS: I will sell this as well:
- the remote without batteries: EUR 15.-
- the remote with ONE right angele adapter: EUR 21.-
- the remote with TWO right angele adapters: EUR: 27.-
plus shipping worldwide - adapters are not sold separate!

> I have posted the spreadsheets in Files folder for synchronisation
> tests carried-out on some supported cameras.

Data for A640 has been added (measurements were taken in continuous
mode). The file type is ordinary txt file.

Damir

Hello all !

I have posted the spreadsheets in Files folder for synchronisation
tests carried-out on some supported cameras.

This gives you an idea of what is involved.

Currently, mis-synch varies from 1/2000 sec to 1/16,000 sec, depending
on camera model.

So far, these are one-off tests.

It would be interesting to know if synch varies with the same model of
camera.


USB-remote is so far tested on ixus800, A570, A620, A630, A640 and A720.

G7 results results are expected soon.

Hopefully we will receive some real-life images demonstrating good synch.


David