[Lvlug] Electronic Cameras: Durability of Image Sensors, etc.?
scott.piccotti at gmail.com
Thu Dec 28 15:48:33 EST 2006
On Dec 28, 2006, at 2:37 PM, Randy Kramer wrote:
> Thanks for the prompt and helpful response!
You're welcome, I'm happy to help. My question to answer ratio on
this list isn't great, so it's nice to get a question I actually know
> On my old Canon FTb-QL, I can lock the mirror up and presumably get
> to the
> image sensor to clean it [...] And I'd feel fairly comfortable
> cleaning it, using one of those old soft brush thingies with a
> rubber bulb to blow air.
You're a braver man than I. ;-)
Those sensors are really fragile. Dust may be bad, but scratches are
a lot worse.
DO NOT use one of those soft brush thingies. That kind of damage
isn't covered by warranty. A bulb blower is best, but can also stir
up even more dust. For stubborn bits, they make a special tool to
pick particles of dust off the sensor. Ask about it when you stop by.
> (I have a preference for Canon.)
I like the Canon stuff a lot, especially for the S/N ratio in low
light. (but that opinion may be outdated by now...)
> I guess that (locking the mirror up) wouldn't work with a
> pentaprism, and at
> least some of the Canon's had something they called a penta-mirror--
> know about that either.
The pentamirror or pentaprism isn't in front of the sensor, so mirror
lock-up works the same on just about any SLR. A pentamirror does the
same thing as a pentaprism, it just uses mirrors instead of a solid
chunk of glass. And technically, an SLR camera typically uses a "roof
pentamirror". (what kind of nerd would I be without a little pedantry?)
See the illustration here:
Mirror lock-up is usually used for long exposures. Without the motion
of the mirror, the body vibrates less and you get a sharper picture.
> I guess I'll plan a trip to Dan's. (I imagine they sell used
> cameras as
They do, but not as much anymore. Since everything went digital it
seems there's less and less market for the used stuff.
> I'd be curious to know what you choose.
Me too! :) I'll keep you posted.
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