Don

Joined: 12th November 2005

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Don
Quote:
:3496ace15f="johnha"]
ChrisABut given that fast accurate AF hasn't been any kind of priority for them until, we hope, now, does anyone really imagine that fast sync is going to be right up there as a priority when even the full frame Nikon D610's X-sync is only 1/200?

Interestingly, the D610 spec sheet says this:

Quote:
="they of whom we may not speak wrote:

X=1/200 s; synchronizes with shutter at 1/250 s or slower (flash range drops at speeds between 1/200 and 1/250 s)
I don't know how that works - I'd have thought the sensor is either fully open or it's not, but there's obviously something else going on.
Looks like there's some sort of HSS going on here. X-sync is when the shutter is fully open at the sensor - so it looks like the flash fires more than once - reducing the flash range as the whole charge can't be used in a single burst.
if it isn't multiburst flash (most likely is) it may be a longer duration burst to make sure that the flash is putting out even color and intensity for the duration of the shutter travel…
it sounds counterintuitive, but.. all flash pulses are not created equal, such a longer flash burst would actually allow for it's own motion blur under some circumstances….
but some flash units have faster bursts than others and some get color shifts at the beginning and and of the burst which shouldn't show up under normal shutter speeds…
my studio strobes cannot freeze acton as well as my portable strobes on low power settings. Longer burst duration….

Comment by Don posted on According to Ricoh Imaging France at 07/11/2013 - 20:25

Don
Pentaxophile wrote:
Yes but if you were into strobism, it might rule Pentax out since Nikons offer a faster sync speed and, crucially, allow you to shoot at higher speeds if you really want to, something Pentax has prevented you doing. In software. Cos the black bar thing is something you can work around. As the Nikon shooters prove by shooting up to 1/400 and higher to overpower ambient light. Ok so they get a little bit of a black bar. The option to shoot at higher speeds shouldn't be taken out of our hands.
the irony here being the whole "strobist" movement was based on the notion that you could do more with less, and that you could light a scene with cheap slaved portable strobes, rather than paying big bucks for studio lighting with all the accessories….

they were all for hacks, and work arounds, until sponsors convinced people you need a "gary fong" rather than a paper cup… etc.

but..
as a guy who shoots BOTH studio style AND strobist style lights, I assure you
I never "hit the ceiling" on the issue of top sync speed. EVER. it's a non issue, unless you're talking to a sales clerk that has ten rows of Canikon gear on the shelf to unload…

Comment by Don posted on According to Ricoh Imaging France at 07/11/2013 - 14:30

Don
well currently the only option to get faster shutter speed is to switch brands. so if the jump from 1/180 to 1/250 really matters, do the math and switch brands.
but you'd have to be pretty bad at math to think it makes sense to switch.

Comment by Don posted on According to Ricoh Imaging France at 07/11/2013 - 11:32

Don
johnriley wrote:
The speed of a focal plane shutter remains the same once the point is reached where the shutter speed is controlled by the width of the slit that crosses the sensor plane.

I was anticipating that a faster running shutter might not last as long, but then the difference of 1/3 stop isn't going to break the bank, so to speak.

As mentioned above somewhere, it might also be limited because of the SR system.

The design engineers could tell us.
I wondered about that too. But I know from motorcycling that when it comes to high performance machines and mechanical bits…. you take any motorcycle and start modding it for speed and weight savings (both of which you do for a faster shutter) the first fifteen pounds and thirty horse power are actually quite affordable… usually an exhaust pipe (as low as $400.00), air filter and airbox mod (as low as $35.00) to attain that much… but..after that…

every additional oz of weight savings and every single gain in horsepower can cost thousands...


so the jump to a faster shutter could very well mean a shorter shutter life OR making the shutter out of much more expensive material.
Remember the old cloth shutters when 1/60 sec was blazingly fast and 1/500 sec was tops? plastics and aluminum made the leap to 1/180 and 1/4000…

so it's possible to get faster sync but maybe cost vs benefits is the issue..
or maybe it's something else… might be the flash tubes can't be matched to the faster speeds…. and having to force customers to upgrade all thier flash units to take advantage of a faster shutter would garner some complaints from customers?

maybe with the new flash units out, a faster shutter is coming down the pipes from pentax in the near future?

McGregNi wrote:
Yes, thats not an excuse. So we're still not really getting any closer to understanding why we can't have flash sync at 250th?
and I still have no clue why this matters so much to some? just to keep up with the joneses? as John said it's a negligible difference in actual use. and easily worked around.

Comment by Don posted on According to Ricoh Imaging France at 07/11/2013 - 11:13

Don
Pentaxophile wrote:
I'm not sure why Pentax have decided to limit sync at 1/180 rather than 1/250; either it's something to do with the shutter system or their engineers are just bloody minded/over cautious. Many users choose to over ride the max. syn speed (on other brands, where it appears to be possible) because sometimes a higher sync speed is worth the risk of black bars appearing in the shot.
maybe they traded off shutter life for shutter speed?
link

Comment by Don posted on According to Ricoh Imaging France at 07/11/2013 - 03:34

Don
my guess is there will be a pentax direct competitor to this camera ..
most likely based on aps-c with k-30 internals and a LX styled body..
Nikon df video
and it will be affordable!

Comment by Don posted on According to Ricoh Imaging France at 06/11/2013 - 18:25

Don
Peter Elgar wrote:
Need a model with 1/250th flash synch -- Canon T 90 and Nikon did it years ago !
I'd settle for a couple leaf shutter lenses.

Comment by Don posted on According to Ricoh Imaging France at 05/11/2013 - 15:04

Don
Shot in a small space, there is surprisingly little photoshop used here.
materials included seamless white, cheap cellophane wrap in translucent blue one softbox, one silver umbrella, one gridded reflector, 3 monoblocks.

the key to this effect was to have the model on the floor looking up. she was laying on the cellophane, we tussled her hair, did the lighting and shot from a scaffold type ladder from directly above.

then we added a layer in photoshop, adding the blue photo filter, some scratches and used frost brushes to brush in the frost on the top layer.

a little dodging and burning was all that was done to the image layer with the model.
the sense of depth comes from the lighting on the model, and the frosted top layer, and the make-up.

Comment by Don posted on NSFW Ice PRoject at 04/11/2013 - 11:44

Don
well I see someone post lots of intelligent comments on various subjects, I cliky linky and see some nice nature, landscape and macro shots, I like.
give you a hint. there is actually a little bit of photoshop in this image.

Comment by Don posted on NSFW Ice PRoject at 04/11/2013 - 01:32

Don
thanx!

Comment by Don posted on NSFW Ice PRoject at 03/11/2013 - 23:08

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