[nickthetasmaniac]

There are lots and lots of ways to keep the cost down, but 1/4000 on FX... thats insane...

I think it has nothing to do with keeping costs down and a whole lot to do with protecting D800 sales...

[cmohr]

Its because they are probably using a lesser shutter and mirror flip mech design to keep costs down, shutter openning and mirror twice the size (the shutter blades are travelling 70% greater distance than APS-C), moving something and stopping it at that speed takes some engineering, thus big costs of bigger format cameras and why Hi-end Cameras are more expensive.

You would probably see that the actual speed the shutterblades themselves travels at and the release timing between Leading and trailing curtains (and thus the size of the exposure strip) would be almost the same between a FF at 1/4000th and a APS-C at 1/7000th, its just that if both are travelling at the same velocity, on the FF it takes longer to cover the 24mm distance, than it takes a shutter to cover the 15mm size of a APS-C.

Which makes my brain ponder, If you have a E800 and you are shooting at 1/8000th, then you put a DX mode, Is the Shutter speed for DX 1/14000th??????? Hmmmmmm.

[Frogfish]

I think it has nothing to do with keeping costs down and a whole lot to do with protecting D800 sales...

Exactly.

[the swede]

Which makes my brain ponder, If you have a E800 and you are shooting at 1/8000th, then you put a DX mode, Is the Shutter speed for DX 1/14000th??????? Hmmmmmm.

Please, ponder more about this! Interesting

My guess is that it would be 1/8000 as it still is the same shutter, if the camera doesnt calculate another value in dx mode... But.. Compare to dx camera? 1/8000 on fx, is it the same value for dx or as you said, slower?

[cmohr]

Please, ponder more about this! Interesting

My guess is that it would be 1/8000 as it still is the same shutter, if the camera doesnt calculate another value in dx mode... But.. Compare to dx camera? 1/8000 on fx, is it the same value for dx or as you said, slower?

Yeah, I was just thinking about it again, My thinking is now that no matter the sensor size/ travelled distance, 24mm or 15mm the release delay between the leading and trailing shutters is still 1/8000th of a second, regardless of how far they travel... I shouldn't try to think about too many things whilst I'm trying to work...lol.

[JinDesu]

Yeah, I was just thinking about it again, My thinking is now that no matter the sensor size/ travelled distance, 24mm or 15mm the release delay between the leading and trailing shutters is still 1/8000th of a second, regardless of how far they travel... I shouldn't try to think about too many things whilst I'm trying to work...lol.

Yep - the exposure time is the same. And also, at high speeds greater than 1/2000s (I think), the shutter doesn't open and close as normal. What the shutter does in those cases is create a slit and run it across the sensor.

There should be a youtube video showing this effect.

[Deimos]

Yeah, I was just thinking about it again, My thinking is now that no matter the sensor size/ travelled distance, 24mm or 15mm the release delay between the leading and trailing shutters is still 1/8000th of a second, regardless of how far they travel... I shouldn't try to think about too many things whilst I'm trying to work...lol.

makes sense

[cmohr]

Yep - the exposure time is the same. And also, at high speeds greater than 1/2000s (I think), the shutter doesn't open and close as normal. What the shutter does in those cases is create a slit and run it across the sensor.

There should be a youtube video showing this effect.

Thats right, but its a lot slower than 1/2000, Its the fastest flash sync speed of a given camera. IE the K-5, 1/180th is the fastest speed that the entire sensor is completely exposed to the light in one go, anything faster and its a gap between the shutters.

[JinDesu]

Thats right, but its a lot slower than 1/2000, Its the fastest flash sync speed of a given camera. IE the K-5, 1/180th is the fastest speed that the entire sensor is completely exposed to the light in one go, anything faster and its a gap between the shutters.

Thanks for the correction! I thought it was actually higher up, but I was quote off!