whoop
Posts: 40
Joined: Wed Jun 13, 2001 2:18 am

What Am I Doing Wrong? (Now With Working Links)

Tue May 17, 2005 7:01 am

I've owned a Canon EOS D60, then a 10D and finally I presently own a 20D

With the 10D I had some focusing problems, or at least I thought they were focusing problems....

The problem is that in certain circumstances I still have the same problem with the output images.

Problem is that with the 10D and a canon plastic kit lens, the 75-300, I used to get a "double edge" effect, or "halos", specially whe used at 300 mm. When I upgraded I got a Canon 100-400 IS L and though that I was going to get rid of the problem, never so far.

Options are: the camera and any long lens behave like this in some circumstances (cloudy days with contrast problems) or in the other hand I am doing something wrong.

Hera are 2 examples I took this weekend in an airshow:



100% crop, equiment mentioned above, ISO 200, 1/1600, f8.0, lens is at 400mm end, Tiffen protection filter, IS on.
Note the white cross on the tail of the aircraft, see the double edge o border? notice also the horizontal stabilizer, same effect.




Same data as on the previous one. Note the numbers on the tail. It shoud read C15 - 36, well, I read C115 - 316, there are a couple of extra ones there thanks to my "double border" effect (noticeable in other parts of the pic, like the logo below thwe numbers)

Does this happen to any of you 20D/100-400 IS L users out there?

Am I doing something wrong?

TNX a lot.

WHoOp.

[Edited 2005-05-17 00:20:15]
 
INNflight
Posts: 3526
Joined: Tue Apr 13, 2004 5:11 am

RE: What Am I Doing Wrong? (Now With Working Links)

Tue May 17, 2005 7:24 am

Quoting Whoop (Thread starter):
Here are 2 examples I took this weekend in an airshow:

In general, Image Stabilizer should not be used for airshow photography!

Why?

It's too slow for the incredibly fast moving objects if you turn / pull your camera with the object flying by!

That does, most probably, cause the above seen problems.

The advice I'd give you, don't use IS the next times! With a shutter speed of 1/1600 there's no need for anyway!

Florian
Jet Visuals
 
jran225
Posts: 298
Joined: Sun May 02, 2004 10:24 pm

RE: What Am I Doing Wrong? (Non Uploadadable Results)

Tue May 17, 2005 7:29 am

Hey Ivan,

I can only think of two possible causes for your "double border" effect:

  • It could just be that there is too much camera shake to produce a pin-sharp image. I just came back from an airshow and in some of my shots (particulary in those of high-speed passes) I found the exact same effect. I too thought that a 100-400L IS would correct that to some extent, but on those types of shots, motion blur will always be an issue - no matter what camera/lens combination you use!
  • It might be that the filter is causing some sort of deflection of the light entering the lens, which would give you the same distorted results. This is unlikely, but very possible if the filter is not attached properly or is dirty/scratched.

I would suggest experimenting with different camera configurations and shooting conditions. For instance, try taking photos with and without the filter attached. Then try taking still photos, photos of slow-moving aircraft and finally photos of those fast airshow demonstrations and compare the results. If the problem persists, you might want to take the camera down to your local camera store to see whether they might be able to assist you further....either way, good luck and happy shooting! bigthumbsup 

Regards,
-Omar S. Smile
Never tell your girlfriend about all the 'action' you're getting at the airport - only photogs understand that.
 
whoop
Posts: 40
Joined: Wed Jun 13, 2001 2:18 am

RE: What Am I Doing Wrong? (Now With Working Links)

Wed May 18, 2005 10:22 pm

Hello,

I miss comments from well known 20D/100-400 IS L users.

Come on!

Tnx.

WHoOp.
 
IL76
Posts: 2237
Joined: Mon Jan 05, 2004 5:43 am

RE: What Am I Doing Wrong? (Now With Working Links)

Wed May 18, 2005 10:38 pm

I don't think this has anything to do with the camera attached to the lens. Looks like a simple case of motion blur to me and Florian's explanation also sounds very plausible. The IS probably lags behind in a stick-slip movement on very fast subjects causing it to 'see double'.

Eduard
 
javibi
Posts: 1295
Joined: Sat Oct 02, 2004 5:55 pm

RE: What Am I Doing Wrong? (Now With Working Links)

Thu May 19, 2005 2:43 am

Ivan, I do get LOTS of blurry shots like your examples, but I am shooting most of the time 1/30 or 1/60 exposure!  Silly

Seriously, you know I have the same combo, but I did not notice any particular focusing problems in the rare occasions I use fast speeds. I am under the impression that as it has been said the problem in those examples is just motion blur, maybe induced by the IS (you are using mode 2, right?).

Saludos

j
 
wietse
Posts: 3630
Joined: Thu Oct 18, 2001 12:49 am

RE: What Am I Doing Wrong? (Now With Working Links)

Thu May 19, 2005 2:50 am

Quoting Whoop (Reply 3):
Hello,

I miss comments from well known 20D/100-400 IS L users.

Come on!

Tnx.

WHoOp.

/Steps up to the plate  Wink

I just think that it is motion blur. It has all the looks of it. Next time don't use the IS during an airshow. With 1/1600, it isnt needed anyway (like Florian already said)

Cheers,
Wietse
Wietse de Graaf
 
whoop
Posts: 40
Joined: Wed Jun 13, 2001 2:18 am

RE: What Am I Doing Wrong? (Now With Working Links)

Thu May 19, 2005 4:05 am

Ok, tnx a lot.

There is another airshow this saturday, so I´ll remove the filter, turn off the IS and take some tranquilizing pills!

I'll post results monday.

WHoOp
 
wietse
Posts: 3630
Joined: Thu Oct 18, 2001 12:49 am

RE: What Am I Doing Wrong? (Now With Working Links)

Thu May 19, 2005 4:17 am

With the 20D, you can easily go to ISO 400 for fast moving stuff. Just to be safe.
Wietse de Graaf
 
manzoori
Posts: 1459
Joined: Sun Sep 22, 2002 7:08 am

RE: What Am I Doing Wrong? (Now With Working Links)

Thu May 19, 2005 7:25 pm

Quoting INNflight (Reply 1):
In general, Image Stabilizer should not be used for airshow photography!

Why?

It's too slow for the incredibly fast moving objects if you turn / pull your camera with the object flying by!

Interesting... and there's me thinking the reason folk have been getting such crisp shots at airshows with their 100-400Ls was the IS!

This is good news for me then... as long as it's a nice sunny day then my BIGMA, ISO200-400 and a fast shutter speed will do nicely! Roll on Fairford!

Cheers!

Rez
 Big grin
Flightlineimages DOT Com Photographer & Web Editor. RR Turbines Specialist
 
draigonair
Posts: 624
Joined: Tue Oct 10, 2000 8:37 pm

RE: What Am I Doing Wrong? (Now With Working Links)

Thu May 19, 2005 8:11 pm

I recently too had this problem (300D EF100-400mm)getting some blurry images...but this is due to the fact I was using 400/s with the plane going right by me...should of made it faster! Ah well experimenting is good practice!

goodluck mate!

Cheers

Nick
cheers

Who is online

Users browsing this forum: Baidu [Spider] and 9 guests