at the same time, i would like to ask anyone got back focusing problem with a700? my center meter is ok...just other meters give me quite a big problem!!!
Photography The Sony Alpha Thread V45!, The Orange Legion
Photography The Sony Alpha Thread V45!, The Orange Legion
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Sep 12 2010, 10:44 PM
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Junior Member
266 posts Joined: Apr 2007 From: a professional diver |
hi, i hope to add me to your a700 userlist here...thanks!
at the same time, i would like to ask anyone got back focusing problem with a700? my center meter is ok...just other meters give me quite a big problem!!! |
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Sep 13 2010, 11:24 PM
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266 posts Joined: Apr 2007 From: a professional diver |
QUOTE(albnok @ Sep 12 2010, 11:08 PM) RazorVista: Make sure that you are not recomposing. Oh, i am sure i am not recomposing as i do not really know how until now. My back focusing is on other meter point. My CF point is working perfectly. http://www.mhohner.de/recompose.php Your A700 center AF sensor is made of two cross-type sensors and one F2.8 sensor, thus made out of a total of 5 line sensors. It can detect detail to focus on in both horizontal and vertical direction. However the other sensors are line sensors which mean they can only detect detail best in one direction. If the line sensor is horizontal, you can focus on a vertical wall fine, but you might have problems using this same line sensor to focus on the edge of a horizontal table. My A700 had backfocus on the center AF point. It would happen at further distances with my Minolta 50mm F1.4. This is one of two common cases - the other is backfocus with wide-angle lenses and the 16mm end of the Zeiss 16-80mm (which miraculously focuses fine at 18mm!) evilhomura89: Thanks for finding the quote! They might be able to fix battery life, come up with some hack for RGB, and 10 FPS live feed, but the aperture being F3.5, to me, seems to be pretty much set in stone. Though I don't see why they can't keep the aperture wider while using virtual F3.5, this could be done to remove focus shift. * * focus shift is a characteristic of some bright aperture lenses, where if you've focused at F1.4, and stopped down to F8, your lens focus shifts. This happens on the Minolta 50mm F1.4 and Nikkor 50mm F1.4 AF-D, and is optically fixed on the Sigma 50mm F1.4 EX DG HSM. The Sony A230/A900 onwards seemed to have smarter firmware to compensate for this, but my A700 did not, hence I had backfocus with my Minolta 50mm F1.4. At the same time, I would like to ask another question. Is there any major difference between Minolta 75-200 f4.5 and Minolta Beercan 70-210 f4? Because the price is quite a GAP! |
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Sep 13 2010, 11:34 PM
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266 posts Joined: Apr 2007 From: a professional diver |
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