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ovredal73
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The Sigma 50mm f1.4 AF Problem Thread


EDIT UPDATE Please read my post on page two:

https://www.fredmiranda.com/forum/topic/698896/1#6299619





Hopefully people who have this lens can help sort out the AF problems encountered by most Canon FF users.

A quick recap written by Thrice in the Marmite thread:

1. The issue is back focusing when focusing beyond 10\' on full frame bodies
2. Many copies focus perfectly on crop frame bodies
3. The more common issue (if there is one) on crop bodies is front focusing
4. Calibration is NOT the issue - calibrated full frame bodies matched to calibrated sigma 50/1.4\'s get the same issue. It is not correctable with lens profiles in mark III bodies.

Some more points:

1. Are there any problems with Nikons or is this a Canon-only issue?
2. Rumor: Lenses with serials higher than 1009xxx should be fixed. Can anybody confirm or dispute this...?
3. I have personally tried four different copies. All with bad AF.
4. All stores and importers seem to \"not know anything about this problem\". Great.
5. Please post comments or any knowledge to this issue. The lens gives fantastic images when focused...

For fun - a shot I made, using MF on the day I got my copy:
Oct 22, 2008 at 07:34 AM
ovredal73
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Upload & Sell: Off
The Sigma 50mm f1.4 AF Problem Thread


Hopefully people who have this lens can help sort out the AF problems encountered by most Canon FF users.

A quick recap written by Thrice in the Marmite thread:

1. The issue is back focusing when focusing beyond 10\' on full frame bodies
2. Many copies focus perfectly on crop frame bodies
3. The more common issue (if there is one) on crop bodies is front focusing
4. Calibration is NOT the issue - calibrated full frame bodies matched to calibrated sigma 50/1.4\'s get the same issue. It is not correctable with lens profiles in mark III bodies.

Some more points:

1. Are there any problems with Nikons or is this a Canon-only issue?
2. Rumor: Lenses with serials higher than 1009xxx should be fixed. Can anybody confirm or dispute this...?
3. I have personally tried four different copies. All with bad AF.
4. All stores and importers seem to \"not know anything about this problem\". Great.
5. Please post comments or any knowledge to this issue. The lens gives fantastic images when focused...

For fun - a shot I made, using MF on the day I got my copy:
Oct 20, 2008 at 07:30 AM
ovredal73
Offline
Upload & Sell: Off
The Sigma 50mm f1.4 AF Problem Thread


Hopefully people who have this lens can help sort out the AF problems encountered by most Canon FF users.

A quick recap written by Thrice in the Marmite thread:

1. The issue is back focusing when focusing beyond 10\' on full frame bodies
2. Many copies focus perfectly on crop frame bodies
3. The more common issue (if there is one) on crop bodies is front focusing
4. Calibration is NOT the issue - calibrated full frame bodies matched to calibrated sigma 50/1.4\'s get the same issue. It is not correctable with lens profiles in mark III bodies.

Some more points:

1. Are there any problems with Nikons or is this a Canon-only issue?
2. IRumor: Lenses with serials higher than 1009xxx should be fixed. Can anybody confirm or dispute this...?
3. I have personally tried four different copies. All with bad AF.
4. Please post comments or any knowledge to this issue. The lens gives fantastic images when focused...

For fun - a shot I made, using MF on the day I got my copy:
Oct 20, 2008 at 07:28 AM
ovredal73
Offline
Upload & Sell: Off
The Sigma 50mm f1.4 AF Problem Thread


Hopefully people who have this lens can help sort out the AF problems encountered by most Canon FF users.

A quick recap written by Thrice in the Marmite thread:

1. The issue is back focusing when focusing beyond 10\' on full frame bodies
2. Many copies focus perfectly on crop frame bodies
3. The more common issue (if there is one) on crop bodies is front focusing
4. Calibration is NOT the issue - calibrated full frame bodies matched to calibrated sigma 50/1.4\'s get the same issue. It is not correctable with lens profiles in mark III bodies.

Some more points:

1. Are there any problems with Nikons or is this a Canon-only issue?
2. I have seen a post that from serial 1009xxx the lens could be fixed. But only one mention of this in the Marmite thread. Anybody with a serial number higher than this willing to confirm or dispute this...? There are no lenses with this serial in Norway at the moment, so I canīt check personally.
3. I have personally tried 4 different copies on my 5D all having this issue to a severe, non-usable degree. I currently own one with serial 1006xxx, which I am going to return in a couple of days, after one last round of tests.
4. Please post comments or any knowledge to this issue. The lens gives fantastic images when focused...

For fun - a shot I made, using MF on the day I got my copy:
Oct 20, 2008 at 07:27 AM
ovredal73
Offline
Upload & Sell: Off
The Sigma 50/1.4 AF Problem Thread


Hopefully people who have this lens can help sort out the AF problems encountered by most Canon FF users.

A quick recap written by Thrice in the Marmite thread:

1. The issue is back focusing when focusing beyond 10\' on full frame bodies
2. Many copies focus perfectly on crop frame bodies
3. The more common issue (if there is one) on crop bodies is front focusing
4. Calibration is NOT the issue - calibrated full frame bodies matched to calibrated sigma 50/1.4\'s get the same issue. It is not correctable with lens profiles in mark III bodies.

Some more points:

1. Are there any problems with Nikons or is this a Canon-only issue?
2. I have seen a post that from serial 1009xxx the lens could be fixed. But only one mention of this in the Marmite thread. Anybody with a serial number higher than this willing to confirm or dispute this...? There are no lenses with this serial in Norway at the moment, so I canīt check personally.
3. I have personally tried 4 different copies on my 5D all having this issue to a severe, non-usable degree. I currently own one with serial 1006xxx, which I am going to return in a couple of days, after one last round of tests.
4. Please post comments or any knowledge to this issue. The lens gives fantastic images when focused...

For fun - a shot I made, using MF on the day I got my copy:
Oct 19, 2008 at 09:34 AM





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