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Eos 7D focus problem?

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banehawi
banehawi Critique Team 9706 forum postsbanehawi vcard Canada2668 Constructive Critique Points
19 Mar 2013 - 8:34 PM

Yes mike, micro is for AF. Would check other lens, or this one without the TC to try to eliminate the lens and the TC. If the problem follows the camera, it back to Canon.




W

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19 Mar 2013 - 8:34 PM

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Ade_Osman
Ade_Osman e2 Member 114435 forum postsAde_Osman vcard England36 Constructive Critique Points
19 Mar 2013 - 9:01 PM


Quote: Ade_Osman - are you saying that even with the mirror locked up (as it has to be in live view) it can still move when you operate the shutter?

Sorry Mike....missed your post, very much in and out of EPZ at the moment as I'm exceptionally busy with other stuff, but yes it does indeed move, even if you have the mirror locked up. Try it for yourself with a lens on and listen for the mechanical movement when you push the shutter button. Locking the mirror up does indeed alleviate movement to an extent, but there is still movement within the actual mirror box itself when shutter is fired!

But as I stated in my last post, I think it's the TC causing the problem, try using a extension tube instead if available.....

banehawi
banehawi Critique Team 9706 forum postsbanehawi vcard Canada2668 Constructive Critique Points
19 Mar 2013 - 9:21 PM

Theres quite a lot of web discussions on the same problem Michael. Theres a theory that in Live view, with A Small SCREEN AT 10x the jmage will look way sharper that the camera recorded image, as its downsized and converted to a sharp jpeg. Ive also read that Live Focus is what you need to use, and not live view (dont know the difference).

Are you shooting RAW. and comparing the live view to the RAW image? RAW will be very soft in comparison, as no correction has been made for the anti-alias filter.

Just some info \i found might be useful, - still try with \tc off and another lens. Whats the make of the TC?


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banehawi
banehawi Critique Team 9706 forum postsbanehawi vcard Canada2668 Constructive Critique Points
19 Mar 2013 - 9:37 PM

http://www.michaelmiles.com/2010/03/06/answer-fixing-canon-7d-focus-issue/




Might be worth trying this \hard \reset procedure



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cheddar-caveman
19 Mar 2013 - 10:05 PM

Thanks banehawi - I'll go through that tomorrow and if all else fails I'll try a hard reset. I am shooting RAW and although I initially check on the back screen, and they look soft but as can be seen from the uploaded image they are soft when uploaded to my computer. I can sharpen them up a bit in Lightroom but I didn't have to do this not that long ago. I must also add that the light is not too good where that nest is.

dagr
dagr  1 Australia
20 Mar 2013 - 1:39 AM

Have you tried taking pictures with no UV filters ? All my pics are soft with a UV Filter on but they are pin sharp without the UV Filter on - using an EF 70-300 f4-5.6 lens. I have not tried using a Canon UV filter yet but there are quite a few comments about this. If anyone is interested I have some comparison shots I could upload.

dagr
dagr  1 Australia
20 Mar 2013 - 1:42 AM

Here they are anyway...

ef-70-300-filter-test.jpg

cheddar-caveman
20 Mar 2013 - 9:26 AM

OK, I did a "hard reset" (I think). I took the batteries out overnight and then inserted them this morning. The only thing that seems to have changed was the lost date/time. The file numbering is still there - I thought I'd lose that? Any way, I'll try it out this afternoon when I get a chance.

mikehit
mikehit e2 Member 45760 forum postsmikehit vcard United Kingdom9 Constructive Critique Points
20 Mar 2013 - 10:11 AM

The difference between LiveView and the final image is a puzzling one. The only think I can think of is that the LiveView image has bags of sharpening applied and it is a smaller image (even at 10x magnification). If you do the focussing test indoors, can you try shooting tethered with the LiveView image being projected onto a computer screen and then you will be able to confirm if the final image is the same as the LiveView image.

GlennH
GlennH e2 Member 81822 forum postsGlennH vcard France1 Constructive Critique Points
20 Mar 2013 - 10:48 AM


Quote: The difference between LiveView and the final image is a puzzling one.

Puzzling because it's unlikely. Using the 7D's Live Mode (contrast detection) autofocus setting in conjunction with 10X magnification should theoretically result in very accurate focusing, although it may struggle and be painfully slow in murky conditions. It could at least be a useful test. Ironically the same setting seems poor for accuracy if you don't zoom in, something that Canon vaguely allude to in their manuals (7D and 60D).

mikehit
mikehit e2 Member 45760 forum postsmikehit vcard United Kingdom9 Constructive Critique Points
20 Mar 2013 - 10:53 AM

Glenn - I mentioned it only because cheddar_caveman said just that: he is manually focussing (not AF so contrast detection is not relevant) with LiveView which looks sharp but the final image is blurred.

GlennH
GlennH e2 Member 81822 forum postsGlennH vcard France1 Constructive Critique Points
20 Mar 2013 - 10:59 AM


Quote: Glenn - I mentioned it only because cheddar_caveman said just that: he is manually focussing (not AF so contrast detection is not relevant) with LiveView which looks sharp but the final image is blurred.

I know; all I'm really doing is agreeing and suggesting an accurate auto-focusing test to further rule out any possibility of user error (with apologies to cheddar-caveman if that is outside the bounds of possibility).

cheddar-caveman
20 Mar 2013 - 3:40 PM


Quote: The difference between LiveView and the final image is a puzzling one. The only think I can think of is that the LiveView image has bags of sharpening applied and it is a smaller image (even at 10x magnification). If you do the focussing test indoors, can you try shooting tethered with the LiveView image being projected onto a computer screen and then you will be able to confirm if the final image is the same as the LiveView image.

That's a good idea. I'll have a look at that. I used my other lens today, the Canon 300mm f2.8 with the 1.4X extender and the images are fine. It seems to be tied in with the f5.6 that using the 1.4 with the 300mm f4 would be the largest aperture. But I still can't relate the live view and manual focusing to this!

banehawi
banehawi Critique Team 9706 forum postsbanehawi vcard Canada2668 Constructive Critique Points
20 Mar 2013 - 4:38 PM

The difference between Live View and final image is obvious. Live view is presented on a much smaller screen, and has a LOT of sharpening applied. Its the manual thing thats the puzzler. Lets see if the hard reset did anuthing.


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cheddar-caveman
20 Mar 2013 - 5:10 PM


Quote: The difference between LiveView and the final image is a puzzling one. The only think I can think of is that the LiveView image has bags of sharpening applied and it is a smaller image (even at 10x magnification). If you do the focussing test indoors, can you try shooting tethered with the LiveView image being projected onto a computer screen and then you will be able to confirm if the final image is the same as the LiveView image.

When one does a tethered shoot, should one see a "live" image from the camera before capturing the image? I don't get that, just an image once the shutter is pressed. I was hoping to see a live view to get "sharp" live focusing. Have I not turned something on - quite new to Lightroom?

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