Sigma Flash Problems
Posted 15/05/2009 - 11:06
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Glad you sorted it Ray
When the situation is completely under your control - Manual is the way to go (even if it means a poke in the eye from Basil ).
The onboard technology is excellent for situations where you have no control, but even then it can get it wrong! With the kind of setup you described, using auto might have got some of the shots but others could be wildly off - and you'd have no idea if it was you or the system!
There's a lot to be said for going back to "basics"
Matt
When the situation is completely under your control - Manual is the way to go (even if it means a poke in the eye from Basil ).
The onboard technology is excellent for situations where you have no control, but even then it can get it wrong! With the kind of setup you described, using auto might have got some of the shots but others could be wildly off - and you'd have no idea if it was you or the system!
There's a lot to be said for going back to "basics"
Matt
http://www.mattmatic.co.uk
(For gallery, tips and links)
(For gallery, tips and links)
Posted 15/05/2009 - 15:17
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[quote:3496ace15f="MattMatic]
Nope
The original TTL is a single flash, through-the-lens metering. Instead of the flash doing the metering (as in the older "A" style flash) the camera had a separate sensor taking a reflective reading off the film - telling the flash when to stop. (The camera's multi-segment meter is only usable when the mirror is down.)
P-TTL, which uses a preflash, ditches the separate sensor (apparently there were issues with the reflectivity of the CCD in digital, plus an extra cost) and makes use of the camera's regular metering system. The flash fires before the mirror goes up (you can just discern the preflash through the viewfinder) - so the matrix metering system cna be used. When that's done, the mirror goes up and the main flash fires. The gap between preflash and main flash is usually tiny (fractions of a second), so sometimes it is perceived as a single flash.[/quote]And that's why you write e-books on the subject, and I don't
At least I was part right...
Nope
The original TTL is a single flash, through-the-lens metering. Instead of the flash doing the metering (as in the older "A" style flash) the camera had a separate sensor taking a reflective reading off the film - telling the flash when to stop. (The camera's multi-segment meter is only usable when the mirror is down.)
P-TTL, which uses a preflash, ditches the separate sensor (apparently there were issues with the reflectivity of the CCD in digital, plus an extra cost) and makes use of the camera's regular metering system. The flash fires before the mirror goes up (you can just discern the preflash through the viewfinder) - so the matrix metering system cna be used. When that's done, the mirror goes up and the main flash fires. The gap between preflash and main flash is usually tiny (fractions of a second), so sometimes it is perceived as a single flash.[/quote]And that's why you write e-books on the subject, and I don't
At least I was part right...
Pentax K10d; Metz mecablitz 48 AF-1; Pentax A 50mm F2; Pentax 18-55mm DAII; Sigma 28-300mm F3.5-5.6; Koboron 24-70mm F3.5-4.8. Pentax MZ-7, Zenit 35mm
My Flickr Photos
My Flickr Photos
Posted 15/05/2009 - 15:25
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No problem Road_Dancer ('Twas somewhat tongue-in-cheek!)
Matt
Matt
http://www.mattmatic.co.uk
(For gallery, tips and links)
(For gallery, tips and links)
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5 posts
17 years
Set to manual I can get the sigma to fire at the right time, in the right way(so thats what the M is for on the K20). I can set up the shots with the dance class next week without leaving them hanging around waiting too long. Excellent.
I suppose I expected too much from the on-board technology, just hope I can turn my mental image into a nice picture now, thats always in manual mode, the artistic bit.
I'll check back here for further comments, meanwhile, thanks again.
Ray H