Focus Trap??? Which cameras can I use focus trap with?
- Is there a list of DSLRs I can use "focus trap" with? Canon, Nikon, Sony, Leica, Mamiya, Hasselblad, etc...?
- Can I use with any lens on cameras which capable of the focus trap feature?
I have a few old manual lenses and it would be great to focus on moving subjects...
Thanks a lot!
- Can I use with any lens on cameras which capable of the focus trap feature?
I have a few old manual lenses and it would be great to focus on moving subjects...
Thanks a lot!
0
Comments
Is this what you mean?
If so, I have not used that rarely-available feature for many years ... although I know some of the expensive "pro" cameras will do it. Function 16 in most (if not all) dSLR Series 1 EOS cameras can be used, like if you want to take photos of, say, hummers ... especially if it can trigger burst mode so you can get a great shot. Beyond that, I have not even thought about it in a number of years. Perhaps someone else can be of assistance and come up with a list.
I am pretty sure, though, it will not be inherently available on non-"pro" cameras ... but when it comes to computers and cameras, never say never and never say always, things change so fast and so many things are deeply hidden in the software/firmware/hardware.
Nam et ipsa scientia potestas est.
On my Canon bodies I can use old Pentax and Nikon lenses with a "chipped" adapter and subsequent focus confirmation. Unfortunately auto-aperture is not possible and so the lens must be used wide open for best focus confirmation speed. If the lens is not sharp wide open or if you need to stop the lens down for DOF control or any other reason, this negates much of the usefulness of the focus confirmation.
I did have rather good success using an old Vivitar 500mm, f6.3 prime (Pentax/M42 screw mount) and focus confirmation in the following series (exposure and processing could have been better):
I do think that manual lenses on a modern dSLR for any sort of sports/action would be more of a lesson in frustration, so I cannot recommend it for that application. If you want to try it, Canon bodies work nicely just because of the wide variety of lenses and adapters available due to the short flange-focus distance of Canon bodies and the availability of cheap "chipped" adapters.
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Here's a few words from my Nikon D80 Manual
AF-C Continuous-servo AF
For moving subjects. Camera focuses continuously while shutter-release
button is pressed halfway. Photographs can be taken even when in-focus
indicator is not displayed
Is this the sort of thing you are looking for ?
Carpy
Focus trap (more often called "Trap Focus") is where you preset the focal point of the lens and then wait for the subject to traverse the plane of prime focus. I believe that the OP is interested in a camera that automates this process and only allows tripping the shutter when the cameras AF mechanism detects focus acquisition.
http://en.wikipedia.org/wiki/Autofocus#Trap_focus
AF-C/Continuous-servo AF/AI-Servo focus is something that only applies to AF cameras with AF lenses and which uses the camera to predict subject motion to provide more accurate AF of moving subjects.
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I believe that you could discuss focus trap as a method and technique of manual focus photography, but I think that the OP is inquiring which cameras have the AF automation technology. I could be wrong?
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Maybe
Carpy
Yes, that is a description of the setup and use on some Nikon cameras.
Like I said before, sometimes the camera will trip on the wrong part of the subject so it's not a perfect method for all subjects and all situations. (In fact in most circumstances it works rather poorly so I rarely use it.)
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tnx 4 link
Neil
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