7d focussing issue
Discussion
I'm beginning to suspect something's not quite right with my 7d, i mainly use auto focus and my walkabout lens is a Tamron 17-50mm f2.8 XR Di II VC, the vibration compensation is on more often than not.
I think there's something wrong because my 'hit rate' has significantly reduced over that of my old 400d, often because the thing i thought i was focussing on isn't in focus.
I bought it last summer, approximately 3 weeks after buying it the mirror smashed, i don't know exactly how or when but it was smashed the next time i went to use it and i've not known rage quite like it because the same thing happened a week before to my 400d. I put it down to an old, worn, camera bag which has since been replaced and so far nothing else has broken.
Anyway, i took both cameras to a place in Wembley to be repaired, but not the official Canon place because they couldn't give me any idea of when i'd see my cameras again and i was due to go to Rome within a week.
They repaired the 400d the same day and i've not noticed any difference in it's performance, they'd repaired the mirror on one of them before.
The 7d took them longer, i left it with them for a few days because they had to wait for a specific engineer to be available. I think they said this was the first 7d they'd had to replace the mirror on.
So, after all that comes my question...
Seeing as this may have been the first 7d mirror replacement they'd done, is it possible that they've not done something quite right that's now causing me to question the accuracy of my camera's focussing? Maybe it's not been re-calibrated correctly, or they've used the wrong part - the mirror from a different model perhaps?.
I've got the time now that if i need to send it off, i can - so i'm just wondering if it's worth it or if i just need to be a better photographer?
Cheers
Kev
I think there's something wrong because my 'hit rate' has significantly reduced over that of my old 400d, often because the thing i thought i was focussing on isn't in focus.
I bought it last summer, approximately 3 weeks after buying it the mirror smashed, i don't know exactly how or when but it was smashed the next time i went to use it and i've not known rage quite like it because the same thing happened a week before to my 400d. I put it down to an old, worn, camera bag which has since been replaced and so far nothing else has broken.
Anyway, i took both cameras to a place in Wembley to be repaired, but not the official Canon place because they couldn't give me any idea of when i'd see my cameras again and i was due to go to Rome within a week.
They repaired the 400d the same day and i've not noticed any difference in it's performance, they'd repaired the mirror on one of them before.
The 7d took them longer, i left it with them for a few days because they had to wait for a specific engineer to be available. I think they said this was the first 7d they'd had to replace the mirror on.
So, after all that comes my question...
Seeing as this may have been the first 7d mirror replacement they'd done, is it possible that they've not done something quite right that's now causing me to question the accuracy of my camera's focussing? Maybe it's not been re-calibrated correctly, or they've used the wrong part - the mirror from a different model perhaps?.
I've got the time now that if i need to send it off, i can - so i'm just wondering if it's worth it or if i just need to be a better photographer?
Cheers
Kev
Do some controlled tests.
Remember that the 7d has more pixels than the 400d so will show up any poor technique or focus easier.
Tripod, mlu, timed shot, use live view 10* to manually focus to get an accurate gauge of how sharp the pic should be.
Then defocus , use a single focus point . autofocus and see how it compares.
The lens may need some MA. My friend had a tamron 17-50 and it needed the focus assembly replacing...
Remember that the 7d has more pixels than the 400d so will show up any poor technique or focus easier.
Tripod, mlu, timed shot, use live view 10* to manually focus to get an accurate gauge of how sharp the pic should be.
Then defocus , use a single focus point . autofocus and see how it compares.
The lens may need some MA. My friend had a tamron 17-50 and it needed the focus assembly replacing...
Gassing Station | Photography & Video | Top of Page | What's New | My Stuff