Glitch with Canon 300D?

Paul J Gans wrote:
G.T. wrote:


wrote in message
. ..

In message ,
"Woollyzone" wrote:


No I didn't, but I didn't think there was any light coming in from

behind.

Its possible there was however, so I'll try again and take your advice

and

see if it makes any difference. Thanks for incredibly quick response!

Quite a bit of light can come in through the viewfinder. Outside in
bright daylight, I have seen f-stop and shutter speed figures on the top
LCD of my cameras that showed a considerable amount of light, only to
realize that the lens cap was on. For example, in Av mode at f/8, the
shutter speed might read 1/4. Cover up the viewfinder with my finger,
and it goes to 30s.


Wow, I'm going to check that out. I should be putting the cover on for my
long night exposures.


My 300D came with a viewfinder cover. It is a rubber bit
with some groves on the side meant to be threaded onto
the carry strap. Works just fine.


Yeah, I know, mine is on the strap. Just basically forgot about it.

Greg

--
"Destroy your safe and happy lives before it is too late
The battles we fought were long and hard
Just not to be consumed by rock and roll" - The Mekons

wrote:
[dark frame substraction]

Of course, it would be nice if the black
frame had a filter run on it to remove the pixel-frequency noise.
Anything that isn't a line, a glob, or a streak should be filtered away.

Thanks, but I prefer to do my image degradation later myself.

Two black frames could verify what is repeatable and what isn't even
further. I wouldn't mind losing some burst speed for an optional higher
quality mode.

Go ask Canon. There's the 20Da, maybe there'll be a 20Db for you.

-Wolfgang

In message ,
Wolfgang Weisselberg wrote:

wrote:
[dark frame substraction]

Of course, it would be nice if the black
frame had a filter run on it to remove the pixel-frequency noise.
Anything that isn't a line, a glob, or a streak should be filtered away.

Thanks, but I prefer to do my image degradation later myself.

What degradation? My suggestion was about removing sensor artifacts
that are *repeatable* and are clearly *NOT* signal. The filtering was
to remove the random sensor noise from the blackframe, because
subtracting it *ADDS* random noise to the image. Instead of filtering,
4 black frames could be averaged together, etc.
--


John P Sheehy