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simon, you're right, my mistake! Still, it doesn't seem to make noticable difference. I'll take some samples to see!
don - I said onboard flash.
down side is that due to such high speeds the light ain't going to travel very far!
In 1/1250th light will have travelled 240km 😆 But in seriousness, I thought most full-power flashes took about 1/1000th for complete discharge?
Still, it doesn't seem to make noticable difference. I'll take some samples to see!
one might question the possibility, f/64 for a 10mm lens would be an aperture of 0.15mm, which is smaller than a full stop!
one might question the possibility, f/64 for a 10mm lens would be an aperture of 0.15mm, which is smaller than a full stop!
One might, but creating electromechanical machines capable of such small motions is fairly simple and commonplace these days. It may well be limited earlier than that in reality though and just allow the user to attempt it.
Full stops are massive....the printheads that the last company I worked for make have nozzles put in them that are 0.036mm diameter....
the printheads that the last company I worked for make have nozzles put in them that are 0.036mm diameter....
I don't think the comparison is apt as the maximum aperture is likely to be around 5mm so it's asking a lot of the blades to accurately close so small!
Still don't think it's mechanically that much to ask, but for the price of the camera I suspect it's not capable of going that small. I wonder if it's a "fake" F, working as an electronic shutter adjustment instead.
Yeah - sorry. I was just being facetious or something..... 🙂
In 1/1250th light will have travelled 240km But in seriousness, I thought most full-power flashes took about 1/1000th for complete discharge?
They do, but in high speed sync you're only discharging a portion of the energy stored in the capacitor that fires the flash. This takes less time. The downside is the strobed effect can look weird in the certain situations, and the power of the flash is massively reduced.
FYI The D70 could sync at high speeds without the need for a strobing flash because at higher speeds it used a electronic shutter on it's CCD (i.e. it there isn't a physical shutter it just sampled the ccd at the appropiate moment.) 20D etc uses a focal plane shutter so above 1/250 or (1/300 on the 1D) your stuffed.
In a lot of situations this isn't actually a problem as you can use a slower shutter speed and use the flash to freeze the action (as it has a very short duration under 1/1000 s). Just stop down a couple of stops and the meter for the flash on the subject.