no worries alex73...will try to try again asap. Thanks.

Apologies for the long delay - I ran this very recently and get a "no cameras connected" message.

It's probably better I understand the process a bit better anyway.

To that end, I reverted to this

http://chdk.setepontos.com/index.php?topic=8801.msg104253#msg104253, and using chdkptp determined sx150is properties as follows:

`CurrentItem 0x800a (ISO)`

Current_Item_Value Parameter_Value Test_Mode

0 Auto Av

1 80 M

2 100 M

5 200 M

8 400 M

11 800 M

14 1600 M

I'd prefer to control at least the shutter period in a similar manner but wasn't really sure how to proceed. So, for "Current_Item" from 0x8000 to 0x8081 I ran the hastily scribed & very blunt attached script (as an addition to multicam.lua).

Here is the result:

Current_Item|Current_Item_Value

`0x800a|11`

0x800b|0

0x800c|0

0x800d|0

0x800e|0

0x800f|0

0x8010|0

0x8011|12

0x8012|12

0x8013|6

0x8014|9

0x8015|2

0x8016|0

0x8017|0

0x8018|0

0x8019|1

0x801a|0

0x801b|1

0x801c|3

0x801d|1

0x801e|2

0x801f|0

0x8020|1

0x8021|0

0x8022|0

0x8023|65535

0x8024|0

0x8025|65535

0x8026|1

0x8027|4

0x8028|0

0x8029|0

0x802a|0

0x802b|0

0x802c|1

0x802d|0

0x802e|0

0x802f|1

0x8030|1

0x8031|0

0x8032|0

0x8033|1

0x8034|0

0x8035|0

0x8036|0

0x8037|0

0x8038|1

0x8039|1

0x803a|0

0x803b|1

0x803c|1

0x803d|0

0x803e|1

0x803f|0

0x8040|1

0x8041|1

0x8042|0

0x8043|0

0x8044|0

0x8045|0

0x8046|1

0x8047|0

0x8048|1

0x8049|0

0x804a|0

0x804b|1

0x804c|0

0x804d|1

0x804e|1

0x804f|0

0x8050|1

0x8051|65535

0x8052|1

0x8053|65535

0x8054|0

0x8055|0

0x8056|0

0x8057|1

0x8058|1

0x8059|1

0x805a|1

0x805b|0

0x805c|0

0x805d|0

0x805e|1

0x805f|1

0x8060|0

0x8061|2

0x8062|3

0x8063|1

0x8064|1

0x8065|1

0x8066|1

0x8067|0

0x8068|0

0x8069|1

0x806a|1

0x806b|1

0x806c|0

0x806d|0

0x806e|65535

0x806f|0

0x8070|65535

0x8071|65535

0x8072|1

0x8073|1

0x8074|0

0x8075|65535

0x8076|65535

0x8077|1

0x8078|0

0x8079|18

0x807a|2

0x807b|2

0x807c|2

0x807d|2

0x807e|1

0x807f|1

0x8080|1

0x8081|0

(a) Should it be safe to run script:

`call_event_proc("PTM_SetCurrentItem",Current_Item,Current_Item_Value)`

against all non zero "Current_Item_Value" values in this list?

Is a reasonable method to attempt identification of the "Current_Item" related to shutter period:

(b) manually change the existing shutter period (from that reported in the table above - assuming it is an item in the list)

(c) sequentially run each non zero "call_event_proc("PTM_SetCurrentItem",Current_Item,Current_Item_Value" until I visually see the shutter period change in the Canon display?

and

(d) is there special significance to the "65536" Current_Item_Value entries?