Mark IV - C.FN IV-14

[marco peschiera]

May i ask more information for this settings ?

Really change somethink from 55ms to 40ms ???

Can you see any difference ?
Are you improving your photos ?

[Alfred Forns]

Hi Marco Never experimented with this setting ... don't think its going to make a difference?

[Ed Cordes]

I haven't even looked at it either. Not quite sure what it is for. 15 ms difference is something I can't fathom.

[Joe Milmoe]

The difference in shutter lag with day to day shooting is negligible.

However, if you use something like a phototrap system, you often have to adjust the shutter lag to achieve the correct laser trip / shutter release timing. Shooting scenarios like a bat in flight, at night with multiple flash setup...the adjustment in milliseconds can make or break the shot.

[marco peschiera]

To Alfred>>
If you shot at 10 picture a second ( at a fast time like 1/1000 ) it means in the viewfinder you can see for 440ms ( 1000ms - (55*10) - (1*10) )
the other 560ms are used for the shutter ( 10ms ) and 55ms x photo to:
close mirror, open diafram, open shutter, .... close shutter, close diafram, open mirror.
As well the AF can function for 440ms.

If you use the settings IV -14 it takes:
1000ms - (40ms*10)+(1ms*10)
560ms VIEFINDER OPEN
So you can see a little more and AF can function a little more.

This is how i understand it.
Please correct me if wrote a bullshit;)




To Joe >>may i ask what you mean for "the adjustment in milliseconds can make or break the shot" ??

[arash_hazeghi]

To Alfred>>
If you shot at 10 picture a second ( at a fast time like 1/1000 ) it means in the viewfinder you can see for 440ms ( 1000ms - (55*10) - (1*10) )
the other 560ms are used for the shutter ( 10ms ) and 55ms x photo to:
close mirror, open diafram, open shutter, .... close shutter, close diafram, open mirror.
As well the AF can function for 440ms.

If you use the settings IV -14 it takes:
1000ms - (40ms*10)+(1ms*10)
560ms VIEFINDER OPEN
So you can see a little more and AF can function a little more.

This is how i understand it.
Please correct me if wrote a bullshit;)

To Joe >>may i ask what you mean for "the adjustment in milliseconds can make or break the shot" ??

If you want to calculate the time that mirror is down during continuous shooting you have to use what is called the "mirror blackout time" not the shutter lag, this is the time it takes for the mirror to go up and come back down, during which AF is not possible. This is 80msec according to Canon for single shots. Shutter lag is the delay between the time you fully press the shutter button and the time the shutter curtain opens, this is obviously shorter than the "blackout" time. So if your goal is to allow more time for AF, this function will not have an effect.

[marco peschiera]

Arash, really thanks for your explication.:(:( I'm sad... i was thinking to find my little America:(:(

Are you sure 100% of what you said ?
These 15ms saved ( in the shutter lag) are not improving the AF ?

If not is there anythink that can help me taking a fast small bird at 8m from me with a 400mm ?:confused::confused:

Here there is a gallery of these bee eaters..
http://www.peschieramarco.com/gallerie.htm?ID=81

[arash_hazeghi]

Arash, really thanks for your explication.:(:( I'm sad... i was thinking to find my little America:(:(

Are you sure 100% of what you said ?
These 15ms saved ( in the shutter lag) are not improving the AF ?

If not is there anythink that can help me taking a fast small bird at 8m from me with a 400mm ?:confused::confused:

Here there is a gallery of these bee eaters..
http://www.peschieramarco.com/gallerie.htm?ID=81

Make sure you are using the right setting for AF CFns in MKIV and the correct technique for flight tracking. Also for fast birds make sure shutter speed does not drop below 1/2000 sec. Use the limiter switch on the lens where possible.

[marco peschiera]

Arash,
I'm doing everythink you suggest.
But still not fast AF anought... for a bee eater at 6-7meter with a 400 5.6 lens....