jcolwell wrote:
No. The shutter in the lens acts as the second curtain, and the focal plane shutter in the camera acts as the first curtain (or maybe the other way around, I don't remember). This provides a faster X-synch shutter speed for flash. My 1000S body has X-synch at 1/60sec, and this goes to 1/500 with the leaf shutter lens (see photo).
I gave up on the MF lens leaf shutter approach (because it was futile), and I got a Copal 3. I had used LF lenses for many years on a Shen Hao 4x5 field camera, and I hoped that the M645 leaf shutter lenses would work the same way - but they don't (nor, I think, do the other MF brands)....Show more →
Thanks. I had a look and play with a couple of the N/L lenses today and I can see why it doesn't work, in practical terms. The blind on the leaf shutter needs to stay open for viewing but then needs to be activated (closed) in the correct sequence to prevent film/sensor being exposed and that is all done by a linkage at the rear of the lens. Yes, the shutter can be fired from the 'mirror lockup' cable release once the blind is closed but there isn't a practical way to open and close the blind with the lens on an adapter. Shame about that.
Yakim Peled wrote:
Not if you have X-sync at any speed.
Are you talking about high speed synch with a flash strobing at high frequency ? That's a nice feature that many modern cameras have, but it's a relatively new capability that the M645 cameras didn't have.
Yakim Peled wrote:
Not if you have X-sync at any speed.
Happy shooting,
Yakim.
Which requires a leaf shutter. High Speed sync does not achieve that, it fakes it by strobing the flash at a great power loss. You'll get 3-4 times as much power from your flash using a leaf shutter as you will using FP Sync.
The only DSLR's which can truly sync at all speeds are the Nikon D70, D70s, D50 and D40 as well as IIRC the original Canon 1D. All use hybrid mechanical/electronic shutters with shutter speeds above sync being achieved electronically.They're also software limited to 1/500 when using a dedicated flash to prevent unexpected power loss when the flash duration matches or exceeds the shutter open period (an issue as a SB-800 or similar flash will have a duration of approximately 1/1000 of a second at full power).
Yakim Peled wrote:
Not if you have X-sync at any speed.
mawz wrote:
Which requires a leaf shutter. High Speed sync does not achieve that, it fakes it by strobing the flash at a great power loss. You'll get 3-4 times as much power from your flash using a leaf shutter as you will using FP Sync.
I was thinking. Could you please take a picture of your 80mm lens when it's fully stretched and place near it something (e.g. a pack of cigarettes, ruler etc.) that will serve as a scale? You see, I'm a bit bothered by the huge difference of my 120/4 when it's fully stretched (19cm) to it's normal length (12cm).
If you have more than one, that will be great. Just place them one near the other in one shot.
My place. I won't leave Israel for the foreseeable future. I spend too much money on photographic equipment so I have no money for vacations.
BTW, if and when I'll buy another lens it will probably be on E-bay or in the B&S forum. I simply have money in my PayPal account that just sits there…..
jcolwell wrote:
No. The shutter in the lens acts as the second curtain, and the focal plane shutter in the camera acts as the first curtain (or maybe the other way around, I don't remember
