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Canon 300D - focus problems

 
 
Martin Wildam
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      09-20-2004, 07:47 PM
Hi folks,

I am thinking about to buy the Canon 300D but now I read in a german
journal that most digital SLRs have problems in getting the correct
focus. The focus is (depending on the used lense) more in the back or
more in the front of the object that has been targetted.

Who understands german:
http://www.colorfoto.de/d/52641

They say, that reasons for these problems are
- bad justified AF sensors
- cover glass of CCD/CMOS sensor affects optical behaviour
(affects path of the light rays)
- digital cameras are more sensitive on inaccurate focus
- ...

My question: What are your experiences with focusing problems using
digital SLR cameras, especially with the Canon 300D?

Greetings, Martin.
 
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Todd H.
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      09-20-2004, 07:52 PM
Martin Wildam <(E-Mail Removed)> writes:

> My question: What are your experiences with focusing problems using
> digital SLR cameras, especially with the Canon 300D?


I've found the focus on this camera to be very predictable. Far more
so than any of the cameras in the prosumer point/shoot market which
don't have the through the lens reassurance of something like the
300D/Rebel.

One of the reasons I pulled the trigger on the 300D as an upgrade over
my G2 was for focus predictability and I was not disappointed.

Best Regards,
--
Todd H.
http://www.toddh.net/
 
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Skip M
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      09-20-2004, 08:48 PM
"Martin Wildam" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Hi folks,
>
> I am thinking about to buy the Canon 300D but now I read in a german
> journal that most digital SLRs have problems in getting the correct
> focus. The focus is (depending on the used lense) more in the back or
> more in the front of the object that has been targetted.
>
> Who understands german:
> http://www.colorfoto.de/d/52641
>
> They say, that reasons for these problems are
> - bad justified AF sensors
> - cover glass of CCD/CMOS sensor affects optical behaviour
> (affects path of the light rays)
> - digital cameras are more sensitive on inaccurate focus
> - ...
>
> My question: What are your experiences with focusing problems using
> digital SLR cameras, especially with the Canon 300D?
>
> Greetings, Martin.


That can be a problem with any autofocus system. Some I know say that AF
stands for "Approximate Focus." They often depend on depth of field to
cover any focus errors.

--
Skip Middleton
http://www.shadowcatcherimagery.com


 
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Todd H.
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      09-20-2004, 09:05 PM
Martin Wildam <(E-Mail Removed)> writes:
> Hi folks,
>
> I am thinking about to buy the Canon 300D but now I read in a german
> journal that most digital SLRs have problems in getting the correct
> focus. The focus is (depending on the used lense) more in the back or
> more in the front of the object that has been targetted.
>
> Who understands german:
> http://www.colorfoto.de/d/52641
>
> They say, that reasons for these problems are
> - bad justified AF sensors
> - cover glass of CCD/CMOS sensor affects optical behaviour
> (affects path of the light rays)
> - digital cameras are more sensitive on inaccurate focus
> - ...
>
> My question: What are your experiences with focusing problems using
> digital SLR cameras, especially with the Canon 300D?


Oh, one more thing--you may find this extremely helpful review of the
300D reassuring on this point, if you haven't seen it already.
http://www.dpreview.com/reviews/canoneos300d/page17.asp

Best Regards,
--
Todd H.
http://www.toddh.net/
 
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sid derra
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      09-20-2004, 09:57 PM
"Martin Wildam" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Hi folks,
>
> I am thinking about to buy the Canon 300D but now I read in a german
> journal that most digital SLRs have problems in getting the correct
> focus. The focus is (depending on the used lense) more in the back or
> more in the front of the object that has been targetted.
>
> Who understands german:
> http://www.colorfoto.de/d/52641
>
> They say, that reasons for these problems are
> - bad justified AF sensors
> - cover glass of CCD/CMOS sensor affects optical behaviour
> (affects path of the light rays)
> - digital cameras are more sensitive on inaccurate focus
> - ...
>
> My question: What are your experiences with focusing problems using
> digital SLR cameras, especially with the Canon 300D?
>
> Greetings, Martin.


hi martin...

there was a thread mentioning that exact article a few weeks ago on
de.alt.rec.digitalfotografie => google link: http://tinyurl.com/4nf3v

if you browse the archive there you will find more threads on this topic!

rock on. sid


 
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Des Perado
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      09-21-2004, 08:30 AM

"Georgette Preddy" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed) om...
> it will fail to the same degree. I shoot the 10D all the time and AF


I note the use of the word 'all' there - finally given up on the Sigma shite
then George? Given up trying to get it to work properly have you?


 
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Big Bill
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      09-21-2004, 07:17 PM
On Mon, 20 Sep 2004 21:47:38 +0200, Martin Wildam <(E-Mail Removed)>
wrote:

>Hi folks,
>
>I am thinking about to buy the Canon 300D but now I read in a german
>journal that most digital SLRs have problems in getting the correct
>focus. The focus is (depending on the used lense) more in the back or
>more in the front of the object that has been targetted.
>
>Who understands german:
>http://www.colorfoto.de/d/52641
>
>They say, that reasons for these problems are
> - bad justified AF sensors
> - cover glass of CCD/CMOS sensor affects optical behaviour
> (affects path of the light rays)
> - digital cameras are more sensitive on inaccurate focus
> - ...
>
>My question: What are your experiences with focusing problems using
>digital SLR cameras, especially with the Canon 300D?
>
>Greetings, Martin.


It works pretty well for me.
Using a Digital Rebel (300D) and Canon's 75-300 cheapo lens, I got
this:
http://pippina.us/images/bird0.jpg

Cropped (and with less resizing), this shows how good the auto
focusing can be:
http://pippina.us/images/bird1.jpg

Note the fact that there's a lot of stuff for the autofocus to latch
onto, but it got the bird just fine, even handheld.

Don't listen too much to people who complain, without listening to
those who seem to know how to use the equipment being complained
about.

Bill Funk
Change "g" to "a"
 
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Martin Wildam
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      09-22-2004, 08:25 PM
Thanks to all of you for the interesting input!

I don't know why some people do treat Georgette in an unnice way, maybe
there are reasons for it, but I found these links also interesting.

On 2004-09-21 06:36, Georgette Preddy wrote:
> Martin Wildam <(E-Mail Removed)> wrote in message news:<(E-Mail Removed)>...
>
>>Hi folks,

>
>
>>My question: What are your experiences with focusing problems using
>>digital SLR cameras, especially with the Canon 300D?

>
>
> Stay away from both the Canon 10D and 300D for design flaws in the AF
> system. Virtually all honest Canon users are now admitting there is a
> major problem with both of these cameras, now that Canon, with the
> release of the 20D, claims to have implemented a fix the camera's AF
> system.
>
> http://www.fredmiranda.com/forum/topic/131641
>
> It remains to be seen if the 20D's AF system will work properly or if
> it will fail to the same degree. I shoot the 10D all the time and AF
> is 60/40 in favor of out of focus results, even when a shot is lined
> up very carefully--it doesn't matter what you do, it'll usually miss.
>
> The 10D/300D also has the worst dynamic range of any DSLR by a wide
> margin, due to Canon's low tech CMOS fabrication ('486 era 0.35u fab).
> It is entirely unusable outdoors with bright highlights in the scene.
> Again, Canon users are the complainers:
>
> http://www.robgalbraith.com/ubbthrea...=&fpart=8&vc=1
>
> The 20D is actually a downgrade there, due to truly tiny pixel pitch.
> Noise is high too, noticably worse than the already very noisey 10D as
> tested by dpreview:
>
> http://www.pbase.com/dslr_noise/image/32014486/original
>
> Avoid.

 
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Martin Wildam
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      09-22-2004, 08:29 PM
As I read it depends on the used lenses also and probably the Sigma does
not a good job.

In my case I have a Tamron 70-300 and a Tamron macro lense which I would
like to use with the Canon 300D in addition to the Canon 28-80 lense (if
I decide for that model).

Probably these lenses could lead to similar problems. In any case I
would take all lenses to the dealer to test before buying.

Thanks again to all for the interesting input!

On 2004-09-21 10:30, Des Perado wrote:
> "Georgette Preddy" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed) om...
>
>>it will fail to the same degree. I shoot the 10D all the time and AF

>
>
> I note the use of the word 'all' there - finally given up on the Sigma shite
> then George? Given up trying to get it to work properly have you?
>
>

 
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Phil Wheeler
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      09-22-2004, 08:41 PM


Martin Wildam wrote:

> Thanks to all of you for the interesting input!
>
> I don't know why some people do treat Georgette in an unnice way, maybe
> there are reasons for it, but I found these links also interesting.
>


Preddy (George or Georgette or by the other nom de plumes) is a known
troll. Trashes anything Canon with no data and espouses the inferior
Sigma cameras. Believe *nothing* from that source.

Phil

 
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