05-28-2011, 11:53 PM
[quote name='Brightcolours' timestamp='1306581583' post='8870']
The G lenses (all 3) will lose you the aperture control on micro 4/3rds... The lenses I mentioned concerning the full frame option (with much cheaper lenses doing the same) all have an aperture control ring (35mm f2, 85mm f1.8, 135mm f2 DC).
Concerning cross type sensors or not, cross type is not per definition more quick or accurate. It is just that with line sensors, it can happen that a texture which shows detail/edges in a certain diraction may not be detected (does not happen often, but it can happen). A cross type sensor avoids that in those cases.
The AF speed has nothing to do with the type of AF point, has more to do with the camera's AF module (the computing power of it) and the lens mounted. The 85mm f1.4 and 50mm f1.4 AF-S lenses you list are no speed demons. The 24mm f1.4 is speedy enough to be called "fast". The lenses I listed as alternatives on FF are all screw driven, fast enough for what they are designed for but no speed demons either.
So.. AF speed wise, you won't go a step forward. Generally the 7D is a tad faster in acquiring focus, but a lot depends on the lens mounted. Anyway, the lens types you list are not really designed for tasks where AF speed is a real issue, either. Only the Canon 85mm f1.8 USM is often used for indoor sports shooting, because it has such lightning fast AF.
And it is fine if your reasons are petty. They are your reasons.
[/quote]
thanks for the info, i always thought that the purpose of cross type points are for faster and more accurate af, i guess i was wrong. <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='
' />
The G lenses (all 3) will lose you the aperture control on micro 4/3rds... The lenses I mentioned concerning the full frame option (with much cheaper lenses doing the same) all have an aperture control ring (35mm f2, 85mm f1.8, 135mm f2 DC).
Concerning cross type sensors or not, cross type is not per definition more quick or accurate. It is just that with line sensors, it can happen that a texture which shows detail/edges in a certain diraction may not be detected (does not happen often, but it can happen). A cross type sensor avoids that in those cases.
The AF speed has nothing to do with the type of AF point, has more to do with the camera's AF module (the computing power of it) and the lens mounted. The 85mm f1.4 and 50mm f1.4 AF-S lenses you list are no speed demons. The 24mm f1.4 is speedy enough to be called "fast". The lenses I listed as alternatives on FF are all screw driven, fast enough for what they are designed for but no speed demons either.
So.. AF speed wise, you won't go a step forward. Generally the 7D is a tad faster in acquiring focus, but a lot depends on the lens mounted. Anyway, the lens types you list are not really designed for tasks where AF speed is a real issue, either. Only the Canon 85mm f1.8 USM is often used for indoor sports shooting, because it has such lightning fast AF.
And it is fine if your reasons are petty. They are your reasons.
[/quote]
thanks for the info, i always thought that the purpose of cross type points are for faster and more accurate af, i guess i was wrong. <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='
' />