Re: [PanoToolsNG] Re: Questions about 10-17mm zoom fisheye
- On Sun, 01 Aug 2010 03:41:00 +0900, John Houghton
> --- In PanoToolsNG@yahoogroups.com, "Roger D. Williams" <roger@...>I know what you mean, John, and saw this for myself when I tried to
>> Question 2
>> I have several times read that twisting the camera so that the
>> diagonal of the sensor frame is vertical is no help if you have
>> a lens that already fills the entire frame. I don't see that...
>> If you put the diagonal vertical, you will reduce the size of any
>> nadir or zenith holes and may even eliminate them.
> Roger, The problem is that you don't get nice tidy circular holes. They
> become more like a circular saw shape or like the petals of a flower.
> Try varying pitch and roll of some sample images in PTGui and you will
> see what I mean.
get my 10.5mm Nikon full-frame fisheye to give me four-around by
tilting it. The "petals" were huge and quite intractable.
But, but, BUT! The only problem I'll have with this lens + six around
is the need to fill the nadir and zenith. I thought that if I tilted
the camera and lens until the 180-degree diameter stretched from top
to bottom of the images, I might do away with the holes altogether.
The Pentax\Tokina does have 180-degree FOV along the diagonal at
the 10mm end, if I remember right. Well, I'll soon know... <grin>
I saw such good things written about the 10-17mm zoom fisheye
that I wanted to give it a go. I hesitated over the considerably more
expensive Sigma 8-16mm rectilinear lens because I know I could get
good use out of that for general photography, but eventually plumped
for my FIFTH fisheye lens (after Zenit, Peleng, Nikon and Sigma).
I can always "de-fish" the images...
Will report back later on the results...
- Am 31.07.2010 14:56, schrieb Roger D. Williams:
> I know the Tokina version of this lens, which is available in NikonYou mean the Tokina 10-17mm f3.5 DX?
> and Canon mounts, is in much wider use than the Pentax version, but
> I am hoping that someone knows the NPP, perhaps expressed in mm from
> the front glass? Or some other non-variable feature of the lens?
http://wiki.panotools.org/Entrance_Pupil_Database has a value...
- On Mon, 02 Aug 2010 04:11:56 +0900, Erik Krause <erik.krause@...> wrote:
> Am 31.07.2010 14:56, schrieb Roger D. Williams:Thank you very much, Erik. Exactly what I wanted to know. I must remember
>> I know the Tokina version of this lens, which is available in Nikon
>> and Canon mounts, is in much wider use than the Pentax version, but
>> I am hoping that someone knows the NPP, perhaps expressed in mm from
>> the front glass? Or some other non-variable feature of the lens?
> You mean the Tokina 10-17mm f3.5 DX?
> http://wiki.panotools.org/Entrance_Pupil_Database has a value...
to look in the Wiki every time I have a query, it so often has the answer.
I cannot really understand my reluctance to use a Wiki, but it is generally
the LAST place I think of.