[ivanvernon]

APS-C Pentax K-3 with DA 16-85 @ 53mm, obviously.

Sorry for my confusion. I intended to inquire about the camera and lens used by Jack002 to produce the circular fisheye photos, and not to your photographic postings. Perhaps my Quick Reply became attached to your posting instead of being attached to Jack002 posting. If so I sincerely apologize.

[Shedking]

I love the near-macro ability of the DA 10-17mm

I've seen pictures on the macro threads that are not as close in as the 10-17 can manage:

[jcdoss]

...at or very near closest focus.
K-1mII Silver, K17/4 Fisheye

[Shedking]

When faced with a very tall subject to photograph from ground level , I would normally use a rectilinear wide angle (typically my 16-85 @ 16mm) and apply the necessary tilt shift corrections to correct any elevation I had needed to get the whole shot in frame.

I seem to have stumbled on another way. The 10-17 picture below has been defished by applying the correction profile in Camera Raw. I'm sure it's not a new process, so does anyone else have any good examples to "flaunt"?

This mural, on the side of the Glasgow Old Fruit Market, is the size of a house:

Attached Images

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[Jorgario]

How to get a fish-eye image when the fish-eye lens has been left at home.

Great mirror-lens !!

[Racer X 69]

BTW in case you do not know, the elongate structures on the pelvic fins are called "claspers" and they are used by male chondrichthyes for sperm transfer during reproduction.

And why have they evolved the sawtoothed nose? Do they actually use it for something?

[Racer X 69]

Sorry for my confusion. I intended to inquire about the camera and lens used by Jack002 to produce the circular fisheye photos, and not to your photographic postings. Perhaps my Quick Reply became attached to your posting instead of being attached to Jack002 posting. If so I sincerely apologize.

It's all good Ivan.

Quick reply doesn't attach a post to any other. It only places a post in the discussion, and sometimes it gets beat out by someone else's post.


If you use the quote button it will attach your comment where you wish it to be.

[WPRESTO]

And why have they evolved the sawtoothed nose? Do they actually use it for something?

The theory has always been that they swim into a dense school of little fish, wag their heads side-to-side, wounding and crippling many fish, then eat them a leisure, but I think recent actual observation/research (rather than theory) has thrown considerable doubt on that interpretation of the saw's function.

ADDENDUM after some quick research

1) sawfish do sometimes wound a single prey fish with the saw, but they have apparently never been observed thrashing within a dense school of small fish.
2) sometimes a sawfish will pin prey to the bottom with the elongate rostrum before eating it, but the "teeth" on the rostrum are not used in this case.
30 The saw may be used in combat with another sawfish, or to defend against other more aggressive sharks that may actually try to eat a sawfish.

THE CURRENT MOST POPULAR INTERPRETATION OF THE SAW. The enlarged scales on the sides of the saw are not really what's important, it is simply the length of the rostrum that counts. All sharks have on their head & rostrum special receptor devices (complex to describe fully) called ampullae of Lorenzini that are electrical detectors. An electrical field is generated and detected by these devices. A fish within this field will distort it, because the electrical conductivity of a fish's body is different than that of seawater. The ampullae register the distortion which allows a shark to know that potential prey has entered the field and approximately where it is, a close enough location to guide an attack. With the ampulae of Lorenzini a shark can detect nearby prey in total darkness, in water too cloudy for vision, and sometimes below the surface of a sandy bottom (demonstrated by experiments). It is likely that the elongate rostrum of sawfish extends the ampullae of Lorenzini system, making it much larger than in typical sharks. The saw is covered end-to-end with the tiny pores of this ampullae system.

[ThorSanchez]

Rokinon 8mm. Three exposure HDR.

[Jorgario]

Rokinon 8mm. Three exposure HDR.

Wonderfull composition !!

[JensE]

Rokinon 8mm. Three exposure HDR.

Which building is this?

[ThorSanchez]

Which building is this?

The Antigua building in Ocean City, Maryland. I believe it was modeled on a similar structure in Japan.

[jack002]

[Shedking]

Ferris Wheel, Glasgow Festival

[bariskayhan53]

---------- Post added 08-31-18 at 08:25 PM ----------



10mm
DA10-17 Pentax K-3