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09-29-2016, 08:37 PM   #23341
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QuoteOriginally posted by RobG Quote
If a top line DSLR is needed, it negates the cost advantage in changing vendor - other than providing access to lenses which aren't available for Pentax.



Sorry, I missed that it was the Tamron rather than the Sigma.



See above. If I have to pay the price of a K1 to get better AF performance than the K3, I might as well get the DFA 150-450.



Yet I haven't heard anyone claiming that any Pentax DSLR is good for BIF. Continuous AF on Pentax has been stated as poor compared to Canikon. I've tried CAF on my K5iis and K3 but end up turning it off. I've had more success using normal AF and repeatedly half depressing the shutter release - with aircraft and BIF.

---------- Post added 30-09-16 at 12:21 PM ----------



I still use my K5iis which is only 16MP. The number of megapixels isn't necessarily the point, and yes I saw the smiley.
I still use CAF, just with single point centre focus, and track my subject manually. BIF are tricky regardless, but I've had reasonable success without much practice. Planes are no issue at all. Dragonflies as well, I've done very well with them recently, so I think it may be more down to practice and technique, as much as the gear you have.

09-29-2016, 09:03 PM   #23342
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QuoteOriginally posted by Kevriano Quote
I still use CAF, just with single point centre focus, and track my subject manually. BIF are tricky regardless, but I've had reasonable success without much practice. Planes are no issue at all. Dragonflies as well, I've done very well with them recently, so I think it may be more down to practice and technique, as much as the gear you have.
OK, using which lens and camera may I ask?
09-29-2016, 10:32 PM   #23343
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K3, DA 150 - 450, often with the 1.4 TC.
09-29-2016, 10:55 PM   #23344
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QuoteOriginally posted by RobG Quote
If I have to pay the price of a K1 to get better AF performance than the K3, I might as well get the DFA 150-450.
I use both the K-3 II and K-1 with the DFA 150-450 shooting birds perched and flying.
The K-1 AF does seem to be better than the K-3 II.

Cheers,
Terry

09-30-2016, 05:24 AM - 1 Like   #23345
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QuoteQuote:
Yet I haven't heard anyone claiming that any Pentax DSLR is good for BIF. Continuous AF on Pentax has been stated as poor compared to Canikon. I've tried CAF on my K5iis and K3 but end up turning it off. I've had more success using normal AF and repeatedly half depressing the shutter release - with aircraft and BIF.
This always makes me curious, it's possible to do BiFs with manual lenses...
A-400


And using tracking


But I rarely shoot BiFs and have little opportunity.

So what I'm wondering, is, for a guy like myself for whom BiFs are a small part of my shooting, what is the difference in BiF worth? I'm happy to accept that Cabikon is better, the question to be answered is why should I care? Whenever I've gone out for BiFs, I have some images to show for it. It's not like I'm getting skunked here.

Are there actually people who buy cameras for their BiF capability? Is this relevant to many folk's purchasing decision?

This issue has always seemed to me to be marketing hype.

It's amazing how often fast focusing for BiFs etc is mentioned as if it's part of everyone's purchasing decision.

Last edited by normhead; 09-30-2016 at 06:03 AM.
09-30-2016, 05:32 AM - 1 Like   #23346
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An adult White-bellied Sea-eagle catch for the dinner...taken some time back with my K-S1 + Sigma 150-500mm HSM.



09-30-2016, 06:04 AM - 1 Like   #23347
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QuoteOriginally posted by normhead Quote
This always makes me curious, it's possible to do BiFs with manual lenses...
A-400
Of course you can, just a little practice. These are with SMC A 400mm f/5.6

K-3 and SMC A 400mm f/5.6

Ring-billed Gull



K-1 and SMC A 400mm f/5.6

Barn Owl



K-1 and SMC A 400mm f/5.6

Osprey


Last edited by cleaverx; 09-30-2016 at 06:17 AM.
09-30-2016, 06:23 AM   #23348
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Which leads one to ask... to those who say " I have to have really fast AF for BiFs...." "What's wrong with you? "
The biggest issue with BiFs is my skill win tracking them in the viewfinder. The AF of the camera comes into play at times, but is not the critical element.

Met a guy from Ontario Outdoors shooting an owl in AP a few years ago. He was using high end Canon gear. I saw his published pictures, and I saw one of his prints sell in the Visitors centre, but in the magazine and and as 16x20 print, no one cared that it was bit soft. Sometimes the best gear doesn't get you a clean shot. I have no doubt a Pentax would have been worse. But I also have no doubt, if I'd been in the same location and nailed the shot with my K-1 and A-400, my images would have been a lot better. I guess I'm just a gambler at heart.

I'm willing to gamble that the resolution limitations of fast AF cameras will work in my favour, more than slower AF will mean I don't get images. The one thing that never gets mentioned discussing fast AF, is the price you pay in resolution to get it. I want the image, and the best possible resolution. In going for a fast AF camera, you've already conceded the resolution part.


Last edited by normhead; 09-30-2016 at 06:53 AM.
09-30-2016, 08:55 AM   #23349
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Funny story. I was shooting with a Tamron 400 f4 manual focus lens on the K5 iirc. A friend had a very nice Nikon 300 2.8 on the D7000 or whatever was out at the time. We came across a short eared owl, who hunt by sitting in the grass. The bird was flushed and flew around. I got the best shot, not a great one, but one in focus and clear enough to identify the bird.

Shooting low contrast moving things against changing backgrounds is very tough no matter what you have.

The cormorant in flight was far away, 500mm on the K1. I'm still fighting my gear, but so far am able to get shots that the K3 would not produce.
09-30-2016, 09:31 AM - 8 Likes   #23350
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I parked next to a puddle on a ridgeway track and got these. K-5/FA*600mm F4 ED [IF]/Eckla window mount






This puts me in a very awkward position.
09-30-2016, 09:54 AM - 1 Like   #23351
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QuoteOriginally posted by Ducatigaz Quote
I parked next to a puddle on a ridgeway track and got these. K-5/FA*600mm F4 ED [IF]/Eckla window mount
That's an exemplary series. Photographed that little bird in Iceland, but none turned out as well as yours.
09-30-2016, 10:19 AM - 9 Likes   #23352
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I should have read the above posts on manual BIF before I set off for a windy Lake Ontario this morning. As a result I made the mistake of leaving the autofocus turned on. I had more success with spot focus than expanded area AF. K-3, DA*300mm.





09-30-2016, 08:02 PM - 2 Likes   #23353
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Evening moose, Denali NPP.
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PENTAX K-3 II  Photo 
09-30-2016, 08:04 PM - 1 Like   #23354
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A composition with some context around the animal, I like that.
09-30-2016, 10:09 PM - 1 Like   #23355
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QuoteOriginally posted by Kevriano Quote
K3, DA 150 - 450, often with the 1.4 TC.
Thanks!

QuoteOriginally posted by tduell Quote
I use both the K-3 II and K-1 with the DFA 150-450 shooting birds perched and flying.
The K-1 AF does seem to be better than the K-3 II.
Thanks Terry, good to know, although I have no immediate plan to buy the K1. I'm more interested in a couple of lenses, one of which being the DFA 150-450.

---------- Post added 01-10-16 at 03:11 PM ----------

QuoteOriginally posted by jacamar Quote
I should have read the above posts on manual BIF before I set off for a windy Lake Ontario this morning. As a result I made the mistake of leaving the autofocus turned on. I had more success with spot focus than expanded area AF. K-3, DA*300mm.
Well done! I have very few BIF shots with the DA*300. Were the seagulls reasonably stationary in a headwind?

---------- Post added 01-10-16 at 03:14 PM ----------

By the way, when I was talking about photos of aircraft, I didn't mean large passenger planes. I meant shots in situations like this, where I found CAF didn't work very well on the DA*300 because the AF motor is so slow.

RAAF Avon Sabre A94-983
by RobGeraghty, on Flickr
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