Go Back   Steve's Digicams Forums > Digital SLR and Interchangeable Lens Cameras > Canon EOS dSLR

Reply
 
Thread Tools Search this Thread
Old Feb 6, 2008, 10:11 AM   #1
Super Moderator
 
Mark1616's Avatar
 
Join Date: Oct 2005
Posts: 7,452
Default

Hi all,

I've justrun through the micro calibrationon the1D mkIIIwith the Sigma 120-300mm f2.8 and the Sigma 1.4x and 2x TC's with it, I was amazed how out this lens was.

120-300 +16

120-300 with 1.4x +9

120-300 with 2x -12

I'm thinking the 2x TC is way off and complained a long time ago that I was getting really bad results with it but people said probably it was just picking up and enhancing a slight error on the 120-300 but now this seems wrong. Have you had any experience of calibrating lenses with TC's? What would you do in my position?

Sorry for all the questions on this bad boy, but I'm sure you will get a lot more soon!!!

Mark
Mark1616 is offline   Reply With Quote
Sponsored Links
Old Feb 6, 2008, 11:02 AM   #2
Senior Member
 
Join Date: Oct 2005
Posts: 1,105
Default

hey Mark,

Never had any experience with calibration. I did the following test. Put the camera on the tripod. used a moire filled target for better focussing. Used live mode first to check the focus and noted down the reading the lens scale.

Then focussed with AF button. Compared the two pictures and was surprised to see they were both spot on.

I never wanted to try with the 1.4x which is the max i have used with my 500. Never had a chance to go for the 2x reach yet

But let me check the same today and let u know about the same

Did u try with a different lens, say 70-200

vivek
nymphetamine is offline   Reply With Quote
Old Feb 6, 2008, 11:04 AM   #3
Super Moderator
 
Mark1616's Avatar
 
Join Date: Oct 2005
Posts: 7,452
Default

Thanks,

The other lenses I've tried so far are the Canon 50mm f1.8 and 85mm f1.8 both of which are good at 0.

Could be a Sigma thing, especially with the 2x tc.
Mark1616 is offline   Reply With Quote
Old Feb 6, 2008, 11:37 AM   #4
Moderator
 
Join Date: Aug 2004
Posts: 8,529
Default

For what it's worth my 120-300 was off by about 7. I rarely use the 1.4x TC so I never calibrated for that and I dont use a 2x TC at all.

I will say I went through several rounds of adjustments before I landed on the '7'

In general, these are supposed to be 'micro' adjustments. Presumably anything within the range is still within spec.

The real issue is - when you take the equipment out in the field, are you getting better results? I don't think there's a large enough data pool of 1dmkIII and sigma owners to draw a conclusion as to what a common or acceptable adjustment would be.

So, how do you like the new toy? I didn't appreciate the large bright viewfinder until I went back to use my 20d after a few weeks of shooting the mkIII. For that reason alone, it's difficult for me to pick up the 20d anymore.


edit - just read your other post mark - I see you agree on the viewfinder :G
JohnG is offline   Reply With Quote
Old Feb 6, 2008, 11:40 AM   #5
Super Moderator
 
Mark1616's Avatar
 
Join Date: Oct 2005
Posts: 7,452
Default

Thanks John, well all I can say is you have to love this thing...... I'm impressed with myself that I've only shot once with 10fps and only for 5 frames just to make myself smile!!!!

Thanks for the feedback, I'm doing basic calibration on static subjects to see what I get and then will play around after shooting an event.

Oh, what setting do you all use for jpg, mine is at default 8, have you moved this or found it good enough?
Mark1616 is offline   Reply With Quote
Old Feb 6, 2008, 12:16 PM   #6
Senior Member
 
Join Date: Oct 2005
Posts: 1,105
Default

the jpeg size at max is around 5mb on a really high ISO picture taken in dark with a little DR. But generally at max jpeg quality setttings the pictures are of size around from 2.5-5mb which are really good for me.

I used to shoot raw with a 5d(bummer) and have/had files of sized upto 12mb easilly

if size is not a matter i dont know why i would reduce the jpeg quality size.

I really want u to try the live view too. i enjoy it every bit. Even in field i flip live view sometimes to get shots like these ...this was with live view. it was a static subject handheld with the mark III and 500 with live view. it was alittle, very littlestruggle since at 10X zoom all u have is 1cm of movement to take the sub off the frame...

Also the liveview is terrific when u can rest ur camera on something and dont have to move totally down to the view finder to frame orfocus ur shots.

i love the sonys flip type LCD with view view..what a progress







nymphetamine is offline   Reply With Quote
Old Feb 6, 2008, 12:29 PM   #7
NHL
Senior Member
 
NHL's Avatar
 
Join Date: Jun 2002
Location: 39.18776, -77.311353333333
Posts: 11,547
Default

One question...

-> Does the 1DMrkIII remember the settings with the various combination of TC from one lens or do you have to dial it back in each time (i.e. does it know you have a TC installed)?
NHL is offline   Reply With Quote
Old Feb 6, 2008, 12:31 PM   #8
Super Moderator
 
Mark1616's Avatar
 
Join Date: Oct 2005
Posts: 7,452
Default

From what I've read it sees the combo as a different lens so 70-200 with 1.4 is different to 120-300 with 1.4. However I will only use TC's on the 120-300 (at the moment at least) so not a problem for me.
Mark1616 is offline   Reply With Quote
Old Feb 6, 2008, 7:49 PM   #9
Senior Member
 
Join Date: Oct 2005
Posts: 1,105
Default

Does the 1DMrkIII remember the settings with the various combination of TC from one lens or do you have to dial it back in each time (i.e. does it know you have a TC installed)?

i think it does. There is an option to set lens wise or just once. Itdoes retain that information for that lens..i can confirm soon..
nymphetamine is offline   Reply With Quote
Old Feb 7, 2008, 9:01 AM   #10
NHL
Senior Member
 
NHL's Avatar
 
Join Date: Jun 2002
Location: 39.18776, -77.311353333333
Posts: 11,547
Default

nymphetamine wrote:
Quote:
i think it does. There is an option to set lens wise or just once. Itdoes retain that information for that lens..i can confirm soon..
I'm sure it can retain for the lens, but does it remember the different permutations? i.e.
1. 120-300 f/2.8
2. 120-300 f/2.8 with 1.4x TC
3. 120-300 f/2.8 with 2x TC
-> since there are different fine tune values for each combo even though it's from one lens
NHL is offline   Reply With Quote
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 9:47 PM.