^^^^ Nice! Maybe I need to get my lens checked out then, but if I pull in just a hair from 200mm with the 1.7 attached, I get much better results. I know others who have experienced the same thing, so it may be a sample to sample issue. I agree about the reach, which is why I have the 1.7
geniousc wrote:
Using a 300 2.8 I don't seem to notice much difference at all between the two. It's a long ways from being much slower, maybe a little, but not much slower. I've shot BIF close in many times, coming straight at me. The D300 300 2.8 +1.7 nails it everytime if I do my job. I have no complaints whatsover about slow focus.
Which lens are you using with the 1.7 that yours is so slow?
the original poster asked how both TCs work with the 300mm f4 AF-S, not the 300mm 2.8.
why confuse the matter?
the 1.7X is considerable slower to focus on the 300 f4 af-s. end of story.
The 1.7X is not what I would call "considerably" slower on the AFS 300, at least on a pro body. If you have a D80/D90, etc, then yeah, it will be considerably slower...
Avi B wrote:
The 1.7X is not what I would call "considerably" slower on the AFS 300, at least on a pro body. If you have a D80/D90, etc, then yeah, it will be considerably slower...
it certainly is slower is on my D300. i shot birds all winter with 300 af-s and both teleconverters. ...maybe 20K or more shots.
it is also much slower to focus on my 500 VR than the 1.4X.
the original poster asked how both TCs work with the 300mm f4 AF-S, not the 300mm 2.8. why confuse the matter? the 1.7X is considerable slower to focus on the 300 f4 af-s. end of story.
Not so on a pro body. Just think about it, the focusing sensor is seeing a little more light from a 1.4 as compared to a 1.7. How much difference is there going to be? BTW, the focusing speed is the same with either converter, it's the same focusing motor. The ability to lock on is what changes.
it certainly is slower is on my D300. i shot birds all winter with 300 af-s and both teleconverters. ...maybe 20K or more shots. it is also much slower to focus on my 500 VR than the 1.4X.
If you shot 20K shots you would certainly know then, no denying that .
However I shoot in bright sunny weather and notice very little difference and I'm talking about the 300 F4 AFS now not the 2.8. It just wasn't a big deal the difference that is.
Maybe I need to get my lens checked out then, but if I pull in just a hair from 200mm with the 1.7 attached, I get much better results. I know others who have experienced the same thing, so it may be a sample to sample issue. I agree about the reach, which is why I have the 1.7 