Velocity Reviews - Computer Hardware Reviews

Velocity Reviews > Newsgroups > Computing > Digital Photography > 10D Focus issue - is it "real" ? can Canon test for it?

Reply
Thread Tools

10D Focus issue - is it "real" ? can Canon test for it?

 
 
matt del vecchio
Guest
Posts: n/a
 
      04-14-2004
having heard so much about the focus problem, now im wondering if i
have it. i always unsharp mask every single pic to get a nice sharp
image. OTOH, ive read that all digital cams/scans must do this because
of their nature..

so is it a 100% certified actual known defect that some copies have?
can & does Canon test for it if you ship your 10D to them?


thanks,
matt

--
Matt Del Vecchio
 
Reply With Quote
 
 
 
 
Charles Schuler
Guest
Posts: n/a
 
      04-14-2004
Don't have a 10D, but using a meter stick or a test target tilted at 45
degrees to the image plane is not a particularly difficult experiment to set
up.


 
Reply With Quote
 
 
 
 
Bill Hilton
Guest
Posts: n/a
 
      04-14-2004
>From: http://www.velocityreviews.com/forums/(E-Mail Removed) (matt del vecchio)

>having heard so much about the focus problem, now im wondering if i
>have it. i always unsharp mask every single pic to get a nice sharp
>image. OTOH, ive read that all digital cams/scans must do this because
>of their nature.


You can set the in-camera sharpening higher but most people prefer to do this
later in the flow in Photoshop. What you describe it normal.

>so is it a 100% certified actual known defect that some copies have?
>can & does Canon test for it if you ship your 10D to them?


Here's a link to a good write-up on the problem, with a test you can try
yourself.

http://www.photo.net/learn/focustest/

Bill

 
Reply With Quote
 
Randall Ainsworth
Guest
Posts: n/a
 
      04-14-2004
> having heard so much about the focus problem, now im wondering if i
> have it. i always unsharp mask every single pic to get a nice sharp
> image. OTOH, ive read that all digital cams/scans must do this because
> of their nature..


Jesus, get over it. That was a problem for the initial run about a
year ago. It was fixed long ago.
 
Reply With Quote
 
George Preddy
Guest
Posts: n/a
 
      04-15-2004
(E-Mail Removed) (matt del vecchio) wrote in message news:<(E-Mail Removed). com>...
> having heard so much about the focus problem, now im wondering if i
> have it.


If you wonder, you have it. Every image you take should be this sharp
before any USM is applied...

http://www.pbase.com/image/26898707/original

If they aren't, your camera is defective, just that simple.

> i always unsharp mask every single pic to get a nice sharp
> image.


All Bayer cameras are defective by design--they incoporate a blur
filter specifically to annoy you--oh--and so you don't get an image of
a rainbow mosiac in place of every shot.

> OTOH, ive read that all digital cams/scans must do this because
> of their nature..
>
> so is it a 100% certified actual known defect that some copies have?
> can & does Canon test for it if you ship your 10D to them?
>
>
> thanks,
> matt

 
Reply With Quote
 
Bay Area Dave
Guest
Posts: n/a
 
      04-15-2004
George, you are now up to 5,800 posts! Most are related to
the Foveon. Doesn't that simple fact tell you that you are
OBSESSED?? That's a LOT of arguing!

IF you like your camera so much, why not spend your time
USING it instead of DEFENDING it? Why do you care what
others think of your purchase?? You have failed to convince
anyone of the legitimacy of the numerous (boy is THAT an
understatement!) issues you bring up over and over and over
again. Do you think that by repeating yourself, someone is
suddenly going to think, "Why George, I now see the
light!!"? You've exhausted every possible argument in favor
of the Foveon. Just enjoy your camera and let Canon users
enjoy theirs.

How's your endless argument been working for you SO FAR, George?

dave

George Preddy wrote:

> (E-Mail Removed) (matt del vecchio) wrote in message news:<(E-Mail Removed). com>...
>
>>having heard so much about the focus problem, now im wondering if i
>>have it.

>
>
> If you wonder, you have it. Every image you take should be this sharp
> before any USM is applied...
>
> http://www.pbase.com/image/26898707/original
>
> If they aren't, your camera is defective, just that simple.
>
>
>>i always unsharp mask every single pic to get a nice sharp
>>image.

>
>
> All Bayer cameras are defective by design--they incoporate a blur
> filter specifically to annoy you--oh--and so you don't get an image of
> a rainbow mosiac in place of every shot.
>
>
>> OTOH, ive read that all digital cams/scans must do this because
>>of their nature..
>>
>>so is it a 100% certified actual known defect that some copies have?
>>can & does Canon test for it if you ship your 10D to them?
>>
>>
>>thanks,
>>matt


 
Reply With Quote
 
Mark Roberts
Guest
Posts: n/a
 
      04-15-2004
Bay Area Dave <(E-Mail Removed)> wrote:

>George, you are now up to 5,800 posts! Most are related to
>the Foveon. Doesn't that simple fact tell you that you are
>OBSESSED?? That's a LOT of arguing!
>
>IF you like your camera so much, why not spend your time
>USING it instead of DEFENDING it?


I think George is paid to make all those posts... by Canon.
Certainly no one has done more to soil the reputation of Sigma/Foveon.

--
Mark Roberts
Photography and writing
www.robertstech.com
 
Reply With Quote
 
Bay Area Dave
Guest
Posts: n/a
 
      04-16-2004
Good point! His comments regarding the "poor" quality
pictures from Canon cameras are nothing short of lunacy.

dave

Mark Roberts wrote:

> Bay Area Dave <(E-Mail Removed)> wrote:
>
>
>>George, you are now up to 5,800 posts! Most are related to
>>the Foveon. Doesn't that simple fact tell you that you are
>>OBSESSED?? That's a LOT of arguing!
>>
>>IF you like your camera so much, why not spend your time
>>USING it instead of DEFENDING it?

>
>
> I think George is paid to make all those posts... by Canon.
> Certainly no one has done more to soil the reputation of Sigma/Foveon.
>


 
Reply With Quote
 
George Preddy
Guest
Posts: n/a
 
      04-16-2004
Bay Area Dave <(E-Mail Removed)> wrote in message news:<fEHfc.37353$(E-Mail Removed) om>...
> Good point! His comments regarding the "poor" quality
> pictures from Canon cameras are nothing short of lunacy.


They're not "my comments," see for yourself look how bad the
(interpolated, yuck) Canon 1Ds performas compared to a camera with pro
quality sensor...

http://www.outbackphoto.com/artofraw/raw_05/essay.html
 
Reply With Quote
 
George Preddy
Guest
Posts: n/a
 
      04-16-2004
(E-Mail Removed)dy (Bill Hilton) wrote in message news:<(E-Mail Removed)>...
> >From: (E-Mail Removed) (matt del vecchio)

>
> >having heard so much about the focus problem, now im wondering if i
> >have it. i always unsharp mask every single pic to get a nice sharp
> >image. OTOH, ive read that all digital cams/scans must do this because
> >of their nature.

>
> You can set the in-camera sharpening higher but most people prefer to do this
> later in the flow in Photoshop. What you describe it normal.


It is normal for a heavily interpolated Bayer digital camera--which
most are. But really you should never, ever have to apply unsharp
mask after the fact if the image was taken in focus.

Another important tip is to never, ever shoot JPEG if your camera is a
Bayer, since the heavy artifical sharpening required to make the image
look accepatable will sharpen the JPEG artifacts too. RAW (or 8-bit
TIF is ok in a bind if your camera supports it) is the only way to go.

The only high quality answer for Bayer camera users, unfortunately, is
to downsample your RAW images (after outputing them as 16-bit TIF
images) to the actual size supported by the sensor. Since Bayer
cameras have RGGB mosaic sensors (1 complete color per 4 sensors),
this means downsampling to 25% of the rated, interpolated MP count to
get the optical sharpness you are looking for.

Of course, this reduces the MP count as advertised since they lied to
you and listed an interpolated MP count in the first place, but that's
life, since the sensor count is in fact much smaller than you were
told.
 
Reply With Quote
 
 
 
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
this.window.focus() vs. window.focus() vs. this.focus() Roger Javascript 3 03-08-2007 08:53 PM
depth of field , focus points ,group shot canon 10d IRISH1EAR Digital Photography 8 01-27-2004 03:52 AM
Canon 10D: The Journey To Focus Freedom Bob Pattinson Digital Photography 1 10-26-2003 06:05 AM
Canon 10D's being boycotted in Korea due to major focus error issues... W6DKN Digital Photography 0 08-01-2003 08:31 AM
test test test test test test test Computer Support 2 07-02-2003 06:02 PM



Advertisments