I try to keep around 1/1000th sec for most biking shots
wow, that would have required 62,500 ASA for this!
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DSLR features what do you actually use?
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Posted 2 years ago #
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Just joined tha dslr movement at teh weekend.
How do you guys protect your screens?Posted 2 years ago # -
How do you guys protect your screens?
I soon broke the screen cover that came with it, but Thom Hogan said he'd tried scratching his with a knife to no effect, however, I have managed to make a small scratch somehow...
Posted 2 years ago # -
1/10000th of a sec with flash? Surely that's waaaaaaaay above the synch speed of the flash/camera?
I'd have to agree with you there, but at 1/1000th the 580EX II will sync no problems.
simonfbarnes - Member
I try to keep around 1/1000th sec for most biking shots
wow, that would have required 62,500 ASA for this!
Which bit of "most" didn't you read,
You can do better than that!Even during the day I'll shoot low speed with flash
Peter, click the pick for details, shot at 1/1250 with flash.
Posted 2 years ago # -
I'd have to agree with you there, but at 1/1000th the 580EX II will sync no problems.
how does that work? With a focal plane shutter, the only way to illuminate the whole frame above the sync speed is for the flash to last longer than the entire scanning exposure
Posted 2 years ago # -
Get a GF1
If only I could afford one...... I'd have bought one in a flash.
Posted 2 years ago # -
how does that work?
Dunno!
Posted 2 years ago # -
the D300 will push to 1/320 sync with flash but only by extending the flash fire, one thing i miss about the D70 was the fast flash sync (no shutter)
anyway i use pretty much everything including manual lens presets for older lenses and colour balance tweaking
i don't use AF adjustment, that's the only thing i can think of off the top of my head.
Quite often shoot in 'auto' mode (the D300 doesn't really have that, just program mode)
Posted 2 years ago # -
Just joined tha dslr movement at teh weekend.
How do you guys protect your screens?Google "GGS Screen Protector" excellent bit of kit and much better than the stick on film
Can be bought cheaper on the bay, but definitely worth buyingPosted 2 years ago # -
Multiple flashes fired very quickly like a strobe i believe.
Posted 2 years ago # -
maybe the 20D does not use the mechanical shutter for exposures under 1/250 (the stated maximum), this is what the D70 does. not sure if the 20D has the necessary electronics to do that though
Posted 2 years ago # -
maybe the 20D does not use the mechanical shutter for exposures under 1/250 (the stated maximum)
yes, I was thinking that was the other possibility...
Posted 2 years ago # -
This might help explain FP (Focal Plain) high speed sync for flash units and cameras.
Sorry to go off topic, but this will explain how it's done and what the limitations are (limited distance). This is something the Nikon D700 etc can manage and I imagine many others too.
* As I say, raeding the camera's manual helps refresh the grey matter. On line tutorials are great too!
Posted 2 years ago # -
well it appears i may have been wrong then
can't say i've ever really paid enough attention to shutter speed when using a fill flash
i thought that auto FP ust extended the sync to 1/320 but it actuall enables unlimited exposure albeit with reduced output
Posted 2 years ago # -
20D doesnt go faster than 1/250th with the onboard flash at least. Or at least mine doesn't with the latest firmware etc.
this says different
That says exactly what I said? (smaller pixel size, higher pixel density G6 has much higher diffraction limit.
Posted 2 years ago # -
We're talking about flash units attached to the hotshoe.
If in any doubt, Google FP High Speed Sync canon 20dPosted 2 years ago # -
unlimited exposure
i mean unlimited shutter speed of course
Posted 2 years ago # -
That says exactly what I said? (smaller pixel size, higher pixel density G6 has much higher diffraction limit.
no, it says the smaller the pixel site the worse the diffraction!
Posted 2 years ago # -
20D doesnt go faster than 1/250th with the onboard flash at least. Or at least mine doesn't with the latest firmware etc.
No, not with the onboard flash. Look at my picture on page 2, info clearly shows 1/1250 sec and the flash fired! You simply need a flash with the capability of high speed sync, I thought it was just the 580exII but I also see that the link from above says other canon flashes sync to high speeds.
down side is that due to such high speeds the light ain't going to travel very far!
Posted 2 years ago # -
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?
Posted 2 years ago # -
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!
Posted 2 years ago # -
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.
Posted 2 years ago # -
Full stops are massive....the printheads that the last company I worked for make have nozzles put in them that are 0.036mm diameter....
Posted 2 years ago # -
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!
Posted 2 years ago # -
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.
Posted 2 years ago # -
Yeah - sorry. I was just being facetious or something.....
Posted 2 years ago # -
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.
Posted 2 years ago #
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