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Thread started 27 Sep 2012 (Thursday) 12:36
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Effect of filter and 1.4x Extender on a 7D?

 
Arte ­ Automobilistica
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Sep 27, 2012 12:36 |  #1

Hi
I am going to test my 7D on Sunday and want to ensure that I've done everything right. I want to address the OOF/soft focus issues once and for all. I have read a great deal (too much?) on the subject!

Among other things I found this in another forum;
"2. If you have a filter on the lens, remove it. The very high resolution of the 7D is super critical of any flaws with lens or any optics in front of it."

Has anyone else had similar problems?
Will my Hoya Super HMC 1B effect the image?
What about my 1.4x Extender?
Should I retire my 50 1.8 II?

Any other suggestions?

Thanks


NelPhotos.co.uk (external link)
Work: 7D + Sigma 100-300 4
Play: Kiss X4 + 15-85 IS + 10-22 + 50 1.8 II + Vivitar 1 70-210 3.5
EOS-M + 18-55 + FD 50 1.4 + FD 135 2.8 + Tamron 35-80 1A
G9, SX280 HS + CHDK, Casio EX-FH 100, Toshiba L505-144 & iPad 2

  
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stsva
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Sep 27, 2012 14:37 |  #2

Arte Automobilistica wrote in post #15050252 (external link)
Hi
I am going to test my 7D on Sunday and want to ensure that I've done everything right. I want to address the OOF/soft focus issues once and for all. I have read a great deal (too much?) on the subject!

Among other things I found this in another forum;
"2. If you have a filter on the lens, remove it. The very high resolution of the 7D is super critical of any flaws with lens or any optics in front of it."

Has anyone else had similar problems?
Will my Hoya Super HMC 1B effect the image?
What about my 1.4x Extender?
Should I retire my 50 1.8 II?

Any other suggestions?

Thanks

The only way to tell what effect the filter and/or extender will have is to take controlled test shots with and without them. On the 50, why would you want to "retire" it? It's not the greatest lens in the world, but it's amazing for the cost.


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amfoto1
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Sep 27, 2012 15:08 |  #3

Are you seeing soft focus/OOF with the 50mm or with the 70-200 or with the 15-85 or with all of them?

The 50/1.8 has very iffy autofocus. Folks trying to use Reikan FoCal to set Micro Focus Adjustments usually get frustrated adn just give up on that lens. It doesn't focus consistently (or quickly, or quietly, or very accurately). But, hey, for $150 or less, can't expect much! And when you nail a shot with it, it's pretty amazing for such a cheap lens.

You should have better luck with your two zooms since they are both USM lenses.

On all your lenses, you would be better off simply taking off the filters most of the time and only installing them when they are actually needed. It's silly to expect a thin piece of glass to provide any sort of real protection. In fact, just the opposite can happen... I've seen more than a few lenses scratched by broken filters!

Use a lens hood to protect the lens when shooting... and a lens cap to protect it when not shooting. Both do a better job than any filter can.

Putting a teleconverter on a lens will always degrade image quality to some degree. With better quality TCs and weaker ones such as a 1.4X, it's not a lot. Sort of depends upon the lens, though, too. TCs in general work better with prime (simpler) lenses than with zooms (due to their complexity). Your 70-200 should be okay with it though... it's a good lens to start with so some minor loss of IQ when a mild 1.4X is added isn't going to hurt all that much. Your other lenses simply aren't pracitcal or purposeful to use teleconverter on (even if it could be fitted, which the EF 1.4X II can't)

If you are seeing soft images out of the 7D with all your lenses, it might be your post processing. It uses a fairly strong anti-alias filter and images from 7D tend to need more sharpening than a lot of other models. If you shoot RAW, in particular, you might want to apply some more sharpening and see if that helps.

There's also some discussion about the high density 18MP cameras being more sensitive to camera shake than lower resolution models that came before them. Canon even published a white paper about it a while ago. Just as a precaution, I tend to use my 7D set at an ISO a little higher than other cameras, to insure a slightly higher shutter speed that will counteact any additional sensitivity to camera shake, which can certainly make images look soft. It really shouldn't be any different from your Kiss, though... since that's also an 18MP APS-C camera.

Finally, probably the best suggestion I can give you is to scale back the 7D's AF system to something really simple and straight forward at first.... Such as using only the center AF point. A lot of people have problems jumping in and trying to use some of the "gee whiz" focusing modes inapproptiately... and see focus problems as a result. 7D is very fast focusing, so it can go out of focus just as quickly too when you set it up wrong and don't keep the focus point right where you want it. It takes some time to learn to use it well. Experiment with different focus modes a little at a time and use the multi-point modes very sparingly. I use Single Point about 85-90% of the time or better. Far less frequently, but my second most used is Spot Focus, which is a high precision mode that's a little slower... and also only uses a single point. I use Expansion and Zone pretty rarely and absolutely never use All Points/Auto Selected. Those leave too much up to the camera to try to figure out where I want things focused, and IMO are just asking for missed focus issues.


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OneJZsupra
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Sep 27, 2012 15:13 |  #4

No issues with focus with my 7D... However after getting the focusing motor replaced on my 25-70 I need to do some MA on it.


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Talley
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Sep 27, 2012 15:28 |  #5

I use the Hoya HD Filters and have tested with and without and never notice any effect of them at all.


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John ­ from ­ PA
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Sep 27, 2012 15:33 |  #6

Will my Hoya Super HMC 1B effect the image?
Probably to some degree; how much is acceptable is up to you and how close you look for the degradation.

What about my 1.4x Extender?
There will be a loss of image quality and a considerable loss in the amount of light. The IQ you lose will be a function of subject matter and the shooting conditions.

Should I retire my 50 1.8 II?
Are there problems with the lens? We don't know a thing about your abilities or what type of photography you do so can't really answer the question as posed.




  
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Arte ­ Automobilistica
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Sep 28, 2012 07:33 as a reply to  @ John from PA's post |  #7

Hi
Thanks for the replies (especially amfoto1). First off I didn't intend to dis the 50mm as it is a great lens. I just wanted to raise the issue as I use it all the time that I shoot moto x. Before I bought the 7D I read all the reviews but no one raised the "focus issue". Dpreview and Digital Picture (my body and lens go to guys) said nothing. It was only after my disappointing first shoot that I started traweling the internet only to find that I wasn't the only one to "have problems". I did further research and tried again last week with the 50mm, lost confidence half way through the shoot and reverted back to my "retired and ready to put on ebay" 1D2 who delivered as it always does.
I am going to test the 7D on Sunday at a local meeting and want to make sure that I have done everything and can therefore rely on the results. I've got my C 1-3 settings saved and am just making my final checks. As I don't like changing lenses in the dust I must decide what lens I am going to use before I go.

The post I referred to in the op is the clearest advice (and I can say I've read it all!!) and should form part of the 7D manual.


NelPhotos.co.uk (external link)
Work: 7D + Sigma 100-300 4
Play: Kiss X4 + 15-85 IS + 10-22 + 50 1.8 II + Vivitar 1 70-210 3.5
EOS-M + 18-55 + FD 50 1.4 + FD 135 2.8 + Tamron 35-80 1A
G9, SX280 HS + CHDK, Casio EX-FH 100, Toshiba L505-144 & iPad 2

  
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stsva
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Sep 28, 2012 07:44 |  #8

If you really want to know for sure what's going on with your 7D's focusing, you need to do controlled testing. See here http://photography-on-the.net/forum/showthre​ad.php?t=857871 for some ideas on what to do.


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Yogi ­ Bear
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Sep 28, 2012 18:02 |  #9

Arte Automobilistica wrote in post #15053315 (external link)
Snip.......
The post I referred to in the op is the clearest advice (and I can say I've read it all!!) and should form part of the 7D manual.

Can you please provide a link to the post that you referred to? I'm not having any problems but I'd sure like to read it.

Good luck with your focus issues!

Yogi


Canon EOS 7D | EF-S 17-55mm f/2.8 IS USM | EF-S 55-250mm f/4.0-5.6 IS |
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Arte ­ Automobilistica
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Sep 29, 2012 06:51 |  #10

Yogi Bear wrote in post #15055625 (external link)
Can you please provide a link to the post that you referred to?

http://photography-on-the.net …/index.php/t-1134233.html and it is amfoto1 who is the oracle. Thanks stsva.


NelPhotos.co.uk (external link)
Work: 7D + Sigma 100-300 4
Play: Kiss X4 + 15-85 IS + 10-22 + 50 1.8 II + Vivitar 1 70-210 3.5
EOS-M + 18-55 + FD 50 1.4 + FD 135 2.8 + Tamron 35-80 1A
G9, SX280 HS + CHDK, Casio EX-FH 100, Toshiba L505-144 & iPad 2

  
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Yogi ­ Bear
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Sep 29, 2012 08:50 |  #11

Arte Automobilistica wrote in post #15057199 (external link)
http://photography-on-the.net …/index.php/t-1134233.html and it is amfoto1 who is the oracle. Thanks stsva.

Thank you, Arte Automobilistica!


Canon EOS 7D | EF-S 17-55mm f/2.8 IS USM | EF-S 55-250mm f/4.0-5.6 IS |
EF 100-400mm f/4.5-5.6L IS USM | 250D | EF-S 10-22 mm f/3.5-4.5 USM | 580 EX II |

  
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Arte ­ Automobilistica
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Oct 29, 2012 16:52 as a reply to  @ Yogi Bear's post |  #12

To complete this post I tested my 7D at Silverstone. I did a lot of research and took a great deal of time setting up the camera. Thanks to amphoto 1 again. The 7D performed very well. This shot was tracked (@ -1) through a fence and had to pass a substantial pole. I used centre point expansion, ISO 100, 1/200, f/5.6 at 200mm. I kept the filter on :-)


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NelPhotos.co.uk (external link)
Work: 7D + Sigma 100-300 4
Play: Kiss X4 + 15-85 IS + 10-22 + 50 1.8 II + Vivitar 1 70-210 3.5
EOS-M + 18-55 + FD 50 1.4 + FD 135 2.8 + Tamron 35-80 1A
G9, SX280 HS + CHDK, Casio EX-FH 100, Toshiba L505-144 & iPad 2

  
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Effect of filter and 1.4x Extender on a 7D?
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