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03-12-2019, 02:31 PM   #30736
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QuoteOriginally posted by Davep Quote
What kind of birds are they? What size?
Tawny Frogmouths, about the size of a Raven.

QuoteOriginally posted by sutherland Quote
Birding is near approaching addiction status.
Photographs are what I'm after, birds just make good challenging subjects

QuoteOriginally posted by taks Quote
Hiding so very well I can't tell if I am seeing the birds Two birds?
Two birds this time. Last time I spotted one bird and took a shot, checked to see if there were any others around (should have been three) but couldn't see any, got home and there were two in the shot!

QuoteOriginally posted by dlh Quote
That could be a test for color-blindness.
Not being colour-blind, I can't tell. I'll have to ask our resident Tawny Frogmouth spotters (Helen and Carl spot more than anyone else) if they're colour-blind.


Last edited by alfa75ts; 03-12-2019 at 02:42 PM.
03-12-2019, 02:40 PM - 1 Like   #30737
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Previous shot, two birds about 10 metres (30 feet) up.
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03-12-2019, 04:05 PM   #30738
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QuoteOriginally posted by alfa75ts Quote
Tawny Frogmouths, about the size of a Raven.



Photographs are what I'm after, birds just make good challenging subjects



Two birds this time. Last time I spotted one bird and took a shot, checked to see if there were any others around (should have been three) but couldn't see any, got home and there were two in the shot!



Not being colour-blind, I can't tell. I'll have to ask our resident Tawny Frogmouth spotters (Helen and Carl spot more than anyone else) if they're colour-blind.
Fascinating. Exceptional shot.

---------- Post added Mar 12th, 2019 at 07:15 PM ----------

QuoteOriginally posted by Davep Quote
Fascinating. Exceptional shot.
Is the camouflage because they are predatory, or for protection?
03-12-2019, 05:23 PM - 18 Likes   #30739
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A few recent captures from my K-3ii/FA*600mm F4 ED[IF]/Eckla window mount.

















03-12-2019, 05:27 PM   #30740
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QuoteOriginally posted by Davep Quote
Is the camouflage because they are predatory, or for protection?
They're nocturnal hunters so I guess the darkness hides them from their prey. So primarily I'd say it's so they can remain hidden during the day.

Wiki
03-12-2019, 06:12 PM - 3 Likes   #30741
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And some from this morning:

Little Eagle
White-faced Heron
White-faced Heron
White-necked Heron
Tawny Frogmouths (an attempt to show the view of them from the path which is 10 metres from them but with 450mm instead of 35 I couldn't get far enough away)
Peregrine Falcon (lousy shot, too far away)
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03-13-2019, 07:40 AM - 25 Likes   #30742
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K-3 with the Sigma 500mm F/4.5
03-13-2019, 05:58 PM   #30743
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QuoteOriginally posted by traderdrew Quote
K-3 with the Sigma 500mm F/4.5
A bittern! Lovely shot!

03-13-2019, 07:45 PM - 7 Likes   #30744
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QuoteOriginally posted by onlineflyer Quote
Wow, that's some series.
Thank you. The last photo in the series is my all time high ISO [8000] with my K3-II. The camera seems to get better with age....[I bought the lens new in 1988 so nothing has changed with the lens] ..for the first 6 months with my K3-II ISO 1200 was my limit [with any Pentax lens] and it was not that good...... A female mockingbird at my birdbath in the attached photo [very rare for me as I never have seen a mockingbird take a bath until last year]
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Last edited by stihlmania; 03-13-2019 at 08:24 PM.
03-14-2019, 05:51 AM - 13 Likes   #30745
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03-14-2019, 01:29 PM   #30746
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QuoteOriginally posted by sutherland Quote
Is it possible to conduct a lens calibration test and share your results?

Typically, lens calibration is conducted by being a certain distance away from the calibration target: focal length * n (n is typically a value between 25-50). Since you have a 560mm, I would not expect for you to stand 90 feet away from a target. Instead, I would just choose a 'working' distance. I selected 40 feet when I calibrated my 500mm.

Some additional tips:
- lens on a tripod
- target must be well lit
- turn OFF image stabilization
- shoot at the widest aperture available (in your case, 5.6)
- shoot at a lower ISO (I would aim for 800 or lower)
- shoot with a shutter speed equal to or GREATER than the max focal length to mitigate shake and increase sharpness
- use single point focus

The printout target should be fine, but I would find an image that has a ruler positioned next to the center target. The ruler is used to show degrees of front or back focus.
...
So, I manufactured a calibration tool of sorts, and took about sixty shots, varying the fine adjustment number every three shots or so, using only "live view" autofocus. Distance, about 41'. Results were all over the place. Extremely inconsistent. Finally got the best one I could get with that method (by the way, I was shooting with the camera sideways, and didn't bother to realign the image because the ruler's easier to read that way - the 24" mark is exactly even with the point of focus, and the 2x4 stud, 45 degrees off from plane of target, is eight feet long with approximately one inch increments). (I repeated some sets of test shots because the images were wildly inconsistent. I came to the conclusion that there's something wrong with the autofocus gizmo in the lens, because I tried the same thing with a 70-200 zoom (which tested perfectly at zero adj. value) and with both a K-1 and K-50 with similar results. I did get one sharper image with manual focus but still no comparison to the pictures posted on this thread. By the way, I've never messed with AF calibration before, had it turned off, because no other lens has caused any problems with autofocus.
This w/LV-AF is using an adjustment value of +4:
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Last edited by dlh; 03-14-2019 at 01:48 PM.
03-14-2019, 01:41 PM - 1 Like   #30747
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QuoteOriginally posted by dlh Quote
So, I manufactured a calibration tool of sorts, and took about sixty shots, varying the fine adjustment number every three shots or so, using only "live view" autofocus. Distance, about 41'. Results were all over the place. Extremely inconsistent. Finally got the best one I could get with that method (by the way, I was shooting with the camera sideways, and didn't bother to realign the image because the ruler's easier to read that way - the 24" mark is exactly even with the point of focus, and the 2x4 stud is eight feet long with approximately one inch increments).
The first of these is with manual focus (generally my preferred method), and the second w/LV-AF is using an adjustment value of +4:
That calibration tool should work just fine. One suggestion: shift the ruler down so that the middle of the rule lines up with center point of one of those circle targets. The aim of this is that when you shoot, you can validate the following:
- if the number (on the ruler) directly inline with the target is the sharpest, then no adjustment is necessary
- if the number (on the ruler) directly inline with the target is blurry and a number above it is sharper, that would mean the lens/body combo has back focusing
- if the number (on the ruler) directly inline with the target is blurry and a number below it is sharper, that would mean the lens/body combo has front focusing

I would not use liveview. I would use your viewfinder and center point to target. I would also use your camera's Auto Focus as that is the mechanism you are trying to resolve, not the manual focus.

Review on screen to confirm front or rear focus, then take multiple shots at different AF adjustment points (remember the order in which these are performed). Review on screen to find the best value.
03-14-2019, 02:37 PM - 20 Likes   #30748
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Little Wattlebird sunbathing. K-3 + FA*300 f4.5


I used a little fill flash in each of the next three.

A vocal Lewin's Honeyeater. K-S2 + DA 55-300 PLM at 300mm


More contemplative this time. K-3 + FA*300 f4.5.


Laughing Kookaburra. K-3 + FA*300.
03-14-2019, 04:18 PM - 14 Likes   #30749
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Meet Skippy he's been working out

Note the claws, just what a roo needs when attacked by drop bears



---------- Post added 15th Mar 2019 at 10:34 AM ----------

This goanna was a small one at about 1 metres long



His big cousin though was closer to 2 metres

03-15-2019, 12:52 AM - 1 Like   #30750
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QuoteOriginally posted by Des Quote
Little Wattlebird sunbathing. K-3 + FA*300 f4.5
I used a little fill flash in each of the next three.
A vocal Lewin's Honeyeater. K-S2 + DA 55-300 PLM at 300mm
More contemplative this time. K-3 + FA*300 f4.5.
Laughing Kookaburra. K-3 + FA*300.
QuoteOriginally posted by Mike L Quote
Note the claws, just what a roo needs when attacked by drop bears
This goanna was a small one at about 1 metres long
His big cousin though was closer to 2 metres
Great images, congratulations to both! Thank you for sharing. I love images of the fauna/flora of the other side of our planet (for me) because its both different and familiar at the same time!
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