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May 19, 2013, 10:55:32 PM
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EOS Bodies / How can lens focus ever be "off" in a way that AFMA fixes it?
« on: April 18, 2013, 10:23:54 PM »
Here's a question that's been bugging me.
Why does AFMA fix anything? As I understand modern phase detect focus systems, focus is a closed loop sort of thing The camera tells the lens to change it's focus, and when the camera body sees things are in focus (the phase detect sensors say focus has been achieved) it stops moving the focus on the lens.
How can this "go wrong" in a way that AFMA can fix it? The way I see it is the only way things can go wrong is if the sensor is physically in the wrong spot, meaning an "in focus" in the phase detect sensor doesn't correspond to in focus at the sensor.
Where the lens is shouldn't matter?
So what am I missing?
Thanks!
Why does AFMA fix anything? As I understand modern phase detect focus systems, focus is a closed loop sort of thing The camera tells the lens to change it's focus, and when the camera body sees things are in focus (the phase detect sensors say focus has been achieved) it stops moving the focus on the lens.
How can this "go wrong" in a way that AFMA can fix it? The way I see it is the only way things can go wrong is if the sensor is physically in the wrong spot, meaning an "in focus" in the phase detect sensor doesn't correspond to in focus at the sensor.
Where the lens is shouldn't matter?
So what am I missing?
Thanks!
3
Lenses / EF-S 17-85mm f/4-5.6 Upgrade?
« on: March 07, 2013, 03:03:28 PM »
Hello all,
I'm a "serious" amateur with not much money.
I'm starting to branch out into some easy working gigs (family portraits, pet photos, baby photos), nothing too pro, mostly just a taste to see if it's something I want to dive into more seriously (I THINK I'd really love to do wedding photography, but that's a little beyond my skill at the moment).
I have a 650D/T4i, a VAST upgrade to the 1000D/XS I shot for years with. Since it basically has the same sensor as the 7D it takes what I consider to be very nice pictures.
I long ago upgraded from the kit 18-55mm to the 18-135mm. I found the difference dramatic. My T4i came with the kit 18-135mm STM lens, which is rated even better then the original 18-135mm IS, but frankly image quality wise I don't see a vast difference (it is shaper at wider apertures, but not by a huge amount).
That said, the 18-135mm STM is still a kit lens, and while it is an amazing single lens solution for travel, I do wonder if it's "good enough" for outdoors portait type shoots, especially if people starting paying me money.
So, with all that said, I've looked into things and ALOT of people recommend that a good "next step" is the EF-S 17-85mm f/4-5.6. It's not L glass obviously, but it is supposedly quite an upgrade from kit glass.
Would I notice much of a difference? I know there are other a couple other common options, but they are all quite a bit more expensive:
EF-S 15-85 f/3.5-5.6
EF-S 17-55 f/2.8
The 15-85mm is about $200 more then the 17-85.
The 17-55mm is WAY more, obvious since it's much faster, constant aperture. Alot of people say that lens is a L without the L designation.
According to DXOMARK there isn't much difference between my 18-135 and the 17-85 or 15-85. But alot of people say that DXOMARK isn't very close to real life. The 17-55 DOES score much better, but it's out of my price range, plus I don't like being limited to 55mm on the long end.
So, any advice? Is the 17-85 worth the upgrade? Should I stick with my 18-135 and save up for better glass?
Thanks for any advice!
I'm a "serious" amateur with not much money.
I'm starting to branch out into some easy working gigs (family portraits, pet photos, baby photos), nothing too pro, mostly just a taste to see if it's something I want to dive into more seriously (I THINK I'd really love to do wedding photography, but that's a little beyond my skill at the moment).
I have a 650D/T4i, a VAST upgrade to the 1000D/XS I shot for years with. Since it basically has the same sensor as the 7D it takes what I consider to be very nice pictures.
I long ago upgraded from the kit 18-55mm to the 18-135mm. I found the difference dramatic. My T4i came with the kit 18-135mm STM lens, which is rated even better then the original 18-135mm IS, but frankly image quality wise I don't see a vast difference (it is shaper at wider apertures, but not by a huge amount).
That said, the 18-135mm STM is still a kit lens, and while it is an amazing single lens solution for travel, I do wonder if it's "good enough" for outdoors portait type shoots, especially if people starting paying me money.
So, with all that said, I've looked into things and ALOT of people recommend that a good "next step" is the EF-S 17-85mm f/4-5.6. It's not L glass obviously, but it is supposedly quite an upgrade from kit glass.
Would I notice much of a difference? I know there are other a couple other common options, but they are all quite a bit more expensive:
EF-S 15-85 f/3.5-5.6
EF-S 17-55 f/2.8
The 15-85mm is about $200 more then the 17-85.
The 17-55mm is WAY more, obvious since it's much faster, constant aperture. Alot of people say that lens is a L without the L designation.
According to DXOMARK there isn't much difference between my 18-135 and the 17-85 or 15-85. But alot of people say that DXOMARK isn't very close to real life. The 17-55 DOES score much better, but it's out of my price range, plus I don't like being limited to 55mm on the long end.
So, any advice? Is the 17-85 worth the upgrade? Should I stick with my 18-135 and save up for better glass?
Thanks for any advice!
4
Software & Accessories / Geotagging Software Recommendations?
« on: February 25, 2013, 03:25:23 PM »
Hello everyone,
I have been using GPSPhotoLinker on MacOS to geotag my photos using the gpx files produced by my GPS logger.
I'm now looking for options to do this on Linux (Ubuntu) and/or Windows.
Does anyone have any recommendations? I'd much prefer a Linux solution that costs either free or very little. A windows solution would be OK, but I do most of my flow in Linux.
Thanks, TTYL
I have been using GPSPhotoLinker on MacOS to geotag my photos using the gpx files produced by my GPS logger.
I'm now looking for options to do this on Linux (Ubuntu) and/or Windows.
Does anyone have any recommendations? I'd much prefer a Linux solution that costs either free or very little. A windows solution would be OK, but I do most of my flow in Linux.
Thanks, TTYL
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