p.7 #1 · Tamron 150-600 AI Servo sequential shots only
Bsmooth wrote:
I've got a 1DMKII and a 100-400, and have gotten loads of shots in and out focus with BIF.Sometimes I'll get 3 or 4 in focus and then it just seems to go out all by itself.
Other times I get all out of focus, this is using single shot and AI Focus as well.
This weekend I shot near the beach and was shooting gulls, mostly just for practice. Out of the probably 15 shots or so, I think maybe 5 to 7 were OK. I'm also pumping the shutter button sometime to keep them infocus, shutter speed was about 1/1600 to 1/2000 at 5.6 to 7.1.
Then again I was shooting in or around 15-20 Degrees F, so not sure how much affect that has as well. I did notice it does seem to take a bit longer to focus in cold weather though, so maybe that could be it ? Even on static objects it seems to hunt sometime when its colder....Show more →
Stop using AI Focus. Use AI Servo. There is a good reason why most people don't use it and why it has been deleted from the newer and better cameras. AI Focus sucks and is ineffectual.
p.7 #2 · Tamron 150-600 AI Servo sequential shots only
Bsmooth wrote:
I've got a 1DMKII and a 100-400, and have gotten loads of shots in and out focus with BIF.Sometimes I'll get 3 or 4 in focus and then it just seems to go out all by itself.
Other times I get all out of focus, this is using single shot and AI Focus as well.
Its a wonder you got any in focus shots using AI Focus - like has already been said it sucks.
p.7 #3 · Tamron 150-600 AI Servo sequential shots only
abqnmusa wrote:
The Tamron is an F6.3 lens at 600mm.
Why would anyone expect to use any focus point other than center focus point on an F6.3 lens?
You might get away with center focus point and the 4 assist points.
But expecting anything beyond center point to work seems pointless (off center, zone focus, all points, etc)
I tend to agree and I believe this could be one major reason we're seeing such widely varying results across bodies?
p.7 #5 · Tamron 150-600 AI Servo sequential shots only
abqnmusa wrote:
I am going to order the Tamron and use the center point only, or possibly center & 4 assist points. But only these 2 center point options.
If you can live with that AF limitation it's a great lens and a fantastic value.
p.7 #6 · Tamron 150-600 AI Servo sequential shots only
Here is a sequence of 11 photos captured over 7 seconds with a 1Ds Mkll. It shoots at 4 FPS maximum. Because it is an f/6.3 lens I'm using center point AF only. I use back button focus and did not pump the focus/button during the sequence. The Pelican is flying towards the camera to start, turns parallel to the camera then flies away from the camera before splashing down. The AF lost focus on shot 5, but reacquired focus on the next shot.
The weather was not ideal, but there was some sun. There was also a light fog over the water. Exposure mode was Av, f/8, ISO 800 and the shutter speed varied between 1/1000 to 1/640. Note that the only out of focus shot is the one shot at 1/640, so I suspect part of the blurriness is the shutter speed and not lost focus.
Granted a Brown Pelican is not the fastest of birds, but it does demonstrate that AF does work and on a 10 year old camera to boot. I'm not a spray and pray kind of shooter. I look for position of head, wings etc before pressing the shutter release. I also have to live with an 11 frame buffer. I normally would have stopped shooting once the pelican turn away from the camera, but continued shooting to show what the AF could do with the Tamron.
p.7 #7 · Tamron 150-600 AI Servo sequential shots only
Jeff, I know this is off topic, but were these shot with auto white balance? Shot 3 is quite a bit different than the rest, and would appear to be the most accurate. Just my own curiosity.
p.7 #8 · Tamron 150-600 AI Servo sequential shots only
Now that you mention it, probably not. I shot a bunch of fashion models in the studio on Sunday and had WB set to Flash. I don't remember resetting the WB back to Auto this morning. I'll double check in the morning, when i get in the office, and post back.
p.7 #10 · Tamron 150-600 AI Servo sequential shots only
Imagemaster wrote:
Don, try putting your camera in Tv mode with shutter speed set at 1/2000 and set your camera to auto ISO and let the camera chose the right ISO.
The ISO has no effect on how much light the lens lets in, only how the sensor reacts to the amount of light it receives. Like in the old film days, ASA 25 would produce the best image detail, but you needed good light. ASA 800 would give you grainier images, but you needed less light.
Tony,
I tried your suggestion and got the best set so far. I thought I was all the way out to 600mm but after checkinh I see I was only 450mm. Darn!
p.7 #15 · Tamron 150-600 AI Servo sequential shots only
Tony,
Regardless of the apparent problems with the Aiservo with the Tam 150-600 do you believe it is capable of resolving comparable resolution to say a 100-400 on a higher pixel density camera?
Most of the in focus shots I have seen just don't show much detail in comparison to even a 100-400. The higher ISO shots seem to suffer greater in detail loss than the 100-400 too.
p.7 #16 · Tamron 150-600 AI Servo sequential shots only
^This^
I've been watching this saga unfold on a pair of wide gamut 10-bit color reference monitors, and it is somehow clear that try as one might, waving a wishing wand over a very nice kitchen knife is not going to transform it into a....
p.7 #17 · Tamron 150-600 AI Servo sequential shots only
I think the IQ has been decent to very good on some of the better-executed static shots. Two things to keep in mind are that several posters have acknowledged that this is the first time they are working with such a long focal length, and many of the posted images are 100% (or otherwise large) crops. If the final image you're showing is only 1/10 of the original frame, you're not going to have amazing IQ. Combine this with developing (or non-existent) long lens technique, and you see why we still need more samples from frequent long lens users to accurately gauge IQ in different shooting situations. JMO, of course .
p.7 #20 · Tamron 150-600 AI Servo sequential shots only
Jim Victory wrote:
Tony,
Regardless of the apparent problems with the Aiservo with the Tam 150-600 do you believe it is capable of resolving comparable resolution to say a 100-400 on a higher pixel density camera?
Most of the in focus shots I have seen just don't show much detail in comparison to even a 100-400. The higher ISO shots seem to suffer greater in detail loss than the 100-400 too.
Jim
Jim,
Have a look at these shots by Karl, and see what you think:
