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matam · 03-26-2010, 05:12 AM

Playng around with the included flash of my k-x i noticed that with "M" lenses i can't use rear curtain sync.
Did i miss something or it's really impossible to use it with the bult-in flash?
If i buy an external flash unit will i be able to use it?

Ben_Edict · 03-26-2010, 06:21 AM

M-lenses have limited flash compatibility. You cannot use P-TTL for instance, only the manual flash or a flash set at Auto-mode.

Trailing curtain sinc is only possible if the shutter speed is 1/90s and slower (according to the K20 manual - I don't know what camera you use). As the sync speed in most modes is locked at 1/180s with M-lenses, you cannot have the 2nd curtain sync.

Ben

matam · 03-26-2010, 06:44 AM

Thanks for the answer Ben
If i understand corectly 2nd curtain it's impossible unless you use P-TTL and there isn't a workaround to it (like an external flash in manual setting).

Originally posted by Ben_Edict

cut..
Trailing curtain sinc is only possible if the shutter speed is 1/90s and slower (according to the K20 manual - I don't know what camera you use).cut...
Ben

the same as the k-x

Ben_Edict · 03-26-2010, 07:28 AM

Originally posted by matam

Thanks for the answer Ben
If i understand corectly 2nd curtain it's impossible unless you use P-TTL and there isn't a workaround to it (like an external flash in manual setting).

the same as the k-x

No, 2nd curtain is also possible with manual or Auto-flash modes. The limiting factor is the M-lens (or any more modern lens used with manual aperture.)

Ben

03-26-2010, 05:12 AM	#1
matam Inactive Account Join Date: Mar 2010 Location: Berlin Posts: 112	Flash modes with "M" lenses Playng around with the included flash of my k-x i noticed that with "M" lenses i can't use rear curtain sync. Did i miss something or it's really impossible to use it with the bult-in flash? If i buy an external flash unit will i be able to use it?

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03-26-2010, 06:21 AM	#2
Ben_Edict Veteran Member Join Date: Jul 2007 Location: SouthWest "Regio" Photos: Albums Posts: 3,309	M-lenses have limited flash compatibility. You cannot use P-TTL for instance, only the manual flash or a flash set at Auto-mode. Trailing curtain sinc is only possible if the shutter speed is 1/90s and slower (according to the K20 manual - I don't know what camera you use). As the sync speed in most modes is locked at 1/180s with M-lenses, you cannot have the 2nd curtain sync. Ben

03-26-2010, 06:44 AM	#3
matam Inactive Account Join Date: Mar 2010 Location: Berlin Posts: 112 Original Poster	Thanks for the answer Ben If i understand corectly 2nd curtain it's impossible unless you use P-TTL and there isn't a workaround to it (like an external flash in manual setting). Originally posted by Ben_Edict cut.. Trailing curtain sinc is only possible if the shutter speed is 1/90s and slower (according to the K20 manual - I don't know what camera you use).cut... Ben the same as the k-x

03-26-2010, 07:28 AM	#4
Ben_Edict Veteran Member Join Date: Jul 2007 Location: SouthWest "Regio" Photos: Albums Posts: 3,309	Originally posted by matam Thanks for the answer Ben If i understand corectly 2nd curtain it's impossible unless you use P-TTL and there isn't a workaround to it (like an external flash in manual setting). the same as the k-x No, 2nd curtain is also possible with manual or Auto-flash modes. The limiting factor is the M-lens (or any more modern lens used with manual aperture.) Ben

Flash modes with "M" lenses

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