Posted by writepic on November 11, 2007 at 6:57 PM
had a bit of fun today with a shepherd friend of mine. as he let them out, i hid near the gate and some jumped as they got to me....ok jokes welcome.
15mm lens, 125th @ f3.5 flash.
baaaa
Posted by Mike Smith on November 11, 2007 at 7:11 PM
ah - so this is where woolie jumpers come from.........
Posted by Andy Astbury on November 12, 2007 at 3:39 AM
We've not been diving in the sheep dip have we?
Bet one of these would keep a camen happy for a few days
On a technical note Marky, if you are wondering why there's a 'shadow' in front of the sheeps muzzle well it's because your flash is front-curtain synch'd - switch it to rear curtain on the camera (and slow shutter if you have the option) and that'll disappear next time.
Posted by Tim Munsey on November 12, 2007 at 3:55 AM
Nought like a barmey picture, thanks for the smile.
Interesting stuff re Andy and the flash, flash is a total mystery so all info well received.
Tim
Posted by Andy Astbury on November 12, 2007 at 4:44 AM
Are we sitting comfortably, right, I'll try and explain
When we take a photograph we invariable use a shutter speed much slower than the burn time of the flash tube - 1/10,000th is a pretty slow average flash burn time, and as a consequence the flash and ambient exposures are very different.
If the flash fires when the front curtain opens (front curtain synch) it'll be finished burning long before the rear curtain closes at the end of the 'ambient' exposure time - hence we get a perfectly exposed flash image at the begining of the ambient 'time' followed by a motion blur of the subject moving through the rest of the exposure lit only by ambient light - hence the 'blurr shadow effect' infront of the sheeps muzzle.
Okay you pair - are you still with me - Munsey, wake up lad
This error can be visually corrected for the most part by forcing the flash tube to burn just as the camera decides to terminate the ambient exposure by firing the rear curtain (rear curtain synch).
Okay, now you're thinking the 'blurr shadow effect' moves from infront to behind the subject - yes it does, but visually it's less noticeable, and if we use a shutter speed sufficient to 'freeze' the subject motion under ambient conditions we'll negate it completely.
If we are forced to use a somewhat slower shutter speed then enabling slow synch will help by stretching the tube burn time and dropping the peak output so that the total e.v output of the tube is the same as it would have been under normal circumstances.
That's the theory anyway - in practice, well, just check the old histogram and post view and make your adjustments, and make the sheep do it again!
I've yet to think of a reason we need front curtain synch from a technical standpoint, and leaving the camera set to rear curtain + slow shutter never seems to have any adverse effects so my D2Xs and 1DII are both permanently set.
Enjoy that did you - charitable donations gratefully excepted - mine's a pint
Posted by Tim Munsey on November 12, 2007 at 4:55 AM
Errrr right with you Andy, just as I thought. I'm adjusting my D2X right now. The sun is beaming through the window its time for a wonder, doing some IR stuff.
Cheers for that, a pint you can have.
Tim
Posted by Mark Sisson on November 12, 2007 at 4:55 AM
Fun pic - and a free tutorial too
Mark
Posted by Brian McGeough on November 12, 2007 at 5:17 AM
Yep agree with above, fun image
Cheers
Brian
Posted by Andrew Stagg on November 12, 2007 at 5:42 AM
Never seen an underwater sheep before!
Great fun pic
Andrew
Posted by writepic on November 12, 2007 at 9:41 AM
hehe i'm not going diving in this weather!! well ok only if i have a sheep to warm me up afterwards.
thanks for the tutorial andy. as i was shooting at 125th i didn't think i'd have too much synch trouble, but the sheep was obviously moving faster than i thought!! i do like to play with slow and rear curtain flash in low light, it's taken me a long time to get the hang of it, but it's well worth it for the amazing effects it can get.
are we still running the monthly comps? how about a technique series of catergories instead of subject lead ones?
mark
Posted by Alan Woolnough on November 12, 2007 at 11:07 AM
Good stuff Mark
Alan
Posted by Bob Hastie on November 12, 2007 at 2:14 PM
Hi Mark
Couldn't you have found a pretty one to photograph?
I knew you wouldn't be able to stay away from these for too long.
Bob
Discussion
11 replieshad a bit of fun today with a shepherd friend of mine. as he let them out, i hid near the gate and some jumped as they got to me....ok jokes welcome.
15mm lens, 125th @ f3.5 flash.
baaaa
Bet one of these would keep a camen happy for a few days
On a technical note Marky, if you are wondering why there's a 'shadow' in front of the sheeps muzzle well it's because your flash is front-curtain synch'd - switch it to rear curtain on the camera (and slow shutter if you have the option) and that'll disappear next time.
Interesting stuff re Andy and the flash, flash is a total mystery so all info well received.
Tim
When we take a photograph we invariable use a shutter speed much slower than the burn time of the flash tube - 1/10,000th is a pretty slow average flash burn time, and as a consequence the flash and ambient exposures are very different.
If the flash fires when the front curtain opens (front curtain synch) it'll be finished burning long before the rear curtain closes at the end of the 'ambient' exposure time - hence we get a perfectly exposed flash image at the begining of the ambient 'time' followed by a motion blur of the subject moving through the rest of the exposure lit only by ambient light - hence the 'blurr shadow effect' infront of the sheeps muzzle.
Okay you pair - are you still with me - Munsey, wake up lad
This error can be visually corrected for the most part by forcing the flash tube to burn just as the camera decides to terminate the ambient exposure by firing the rear curtain (rear curtain synch).
Okay, now you're thinking the 'blurr shadow effect' moves from infront to behind the subject - yes it does, but visually it's less noticeable, and if we use a shutter speed sufficient to 'freeze' the subject motion under ambient conditions we'll negate it completely.
If we are forced to use a somewhat slower shutter speed then enabling slow synch will help by stretching the tube burn time and dropping the peak output so that the total e.v output of the tube is the same as it would have been under normal circumstances.
That's the theory anyway - in practice, well, just check the old histogram and post view and make your adjustments, and make the sheep do it again!
I've yet to think of a reason we need front curtain synch from a technical standpoint, and leaving the camera set to rear curtain + slow shutter never seems to have any adverse effects so my D2Xs and 1DII are both permanently set.
Enjoy that did you - charitable donations gratefully excepted - mine's a pint
Cheers for that, a pint you can have.
Tim
Mark
Cheers
Brian
Great fun pic
Andrew
hehe i'm not going diving in this weather!! well ok only if i have a sheep to warm me up afterwards.
thanks for the tutorial andy. as i was shooting at 125th i didn't think i'd have too much synch trouble, but the sheep was obviously moving faster than i thought!! i do like to play with slow and rear curtain flash in low light, it's taken me a long time to get the hang of it, but it's well worth it for the amazing effects it can get.
are we still running the monthly comps? how about a technique series of catergories instead of subject lead ones?
mark
Alan
Couldn't you have found a pretty one to photograph?
I knew you wouldn't be able to stay away from these for too long.
Bob