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Forum: Pentax K-3 & K-3 II
03-08-2016, 01:49 PM
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Hello Rupert, There were some extensive tests reported on the forum, it may have been somewhere on the Big lens club, can't remember, where long lenses were tested with and without Tcs, and if I recall correctly the Pentax 1.4xTC was excellent, as was the 150-450.
The K-1 is of interest to me if the suggested low noise is real...being able to shoot at higher ISO would be a real help.
I find the 150-450 to be very nice. It is a bit of handful but I am used to that now. IQ is excellent.
Cheers,
Terry
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Forum: Pentax K-3 & K-3 II
03-07-2016, 05:55 PM
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Hello Rupert,
Thanks for the above.
I also get good results from the SR using the 150-450 @450, but it is when I add the 1.4xTC that it becomes problematic.
It may be technique, but as others have opined it may be that the SR isn't capable at that FL.
Do you have a 1.4xTC and if so, are you still able to get good shots at low shutter speeds with your Bigma at 500?
Cheers,
Terry
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Forum: Pentax K-3 & K-3 II
03-06-2016, 03:02 PM
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Quote:
Q: Are there any lenses that the Shake Reduction (SR) function of the K-3 cannot be used with?
A: No, there are not. The SR function on the K-3 can be used with all supported lenses. Use a focal length in the range from 8 mm to 2000 mm for lenses for which focal length information cannot be obtained.
Well, that seems clear enough...FL up 2000mm should be OK for K-3.
This additional bit of information is helpful. I'm still trying to sort out in my mind how to mathematically model the process, to come to grips with how many stops improvement we could expect for a given FL...with lots of assumptions of course. If I get anywhere I'll report back.
In the meantime however, the above does help.
From the above, the 150-450 + 1.4xTC should be handled by the SR, and provide some improvement, and it would be good to have a good idea as how much that is.
Just recently I was shooting at 1/1600s handheld and getting some good results, but need to use high ISO to do so, so a lower shutter speed would be good.
Cheers,
Terry
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Forum: Pentax K-3 & K-3 II
03-04-2016, 05:03 PM
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OK, that's helpful.
Knowing the FL may allow some analysis of how the SR will cope longer FLs, and any additional relevant info may help.
Do you have a link to where the lens/FL that was tested came from?
Cheers,
Terry
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Forum: Pentax K-3 & K-3 II
03-03-2016, 07:36 PM
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Sure, all the above is a given, I don't think anyone is going to contest any of it...but it doesn't confirm or otherwise whether the SR actually has the ability to cope with 450 + 1.4xTC or not.
Unless Ricoh/Pentax have actually said so, we are just guessing.
Cheers,
Terry
---------- Post added 03-03-16 at 08:19 PM ----------
Just to clarify a bit more what I'm on about, Pentax claim the K-3 II SR is good for 4.5 stops.
That implies a known vibration, a specific FL, and some criterion for comparing image with original.
If this is the case, what was the FL used and how many stops is the SR good for at other, longer, FLs?
If we had specific info like this we wouldn't have to use qualitative language when attempting to say if the SR will cope with a FL or not.
Cheers,
Terry
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Forum: Pentax K-3 & K-3 II
03-03-2016, 03:08 PM
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The SR works OK for me at 450, it's with the 1.4xTC that I have problems.
It would be nice to know if it's just an opinion or documented fact that the SR can't handle 450+1.4xTC.
Thanks for your info.
Cheers,
Terry
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Forum: Pentax K-3 & K-3 II
02-29-2016, 02:53 PM
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Sorry to bump, but this seems to have slipped off the radar.
Can anyone answer my questions in #6, above?
Cheers,
Terry
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Forum: Pentax K-3 & K-3 II
02-26-2016, 02:57 PM
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It knows the focal length so should know what to set itself at, but are you really saying that the SR can't accommodate that FL?
On that question, has Pentax published any info on the FL that SR will support? I guess that could be quite vague as it would have to assume an amplitude/frequency of vibration.
A monopod is a good solution for some types of shooting, but doesn't suit bird shooting.
I might try turning the SR off when using the 1.4x TC and see if that helps.
Thanks for your comments.
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Forum: Pentax K-3 & K-3 II
02-26-2016, 01:51 AM
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Hello All,
I am using the K-3 II with the 150-450 D-FA and find that I can handhold and get sharp shots most of the time.
I do have trouble when using the 1.4x TC, and rarely get sharp shots even when using decent shutter speeds.
I have managed a few good shots using the 1.4x TC to indicate that the combination is capable of sharp shots.
Anyone else shooting handheld with this setup and having similar problems?
Is the SR on the K-3 II capable of handling the 150-450 + 1.4x TC?
Interested to hear experiences and comments.
Cheers,
Terry
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