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I understand Nikon Capture can convert the fisheye image from the 10.5mm
lens into a rectilinear one, but what focal length rectilinear lens does
that become equal to?

John Falstaff wrote:

> I understand Nikon Capture can convert the fisheye image from the 10.5mm
> lens into a rectilinear one, but what focal length rectilinear lens does
> that become equal to?
>

10.5 mm

"Hans S" <> wrote in message
news:Xns97B0A286824E0lavachequirit@194.109.133.242 ...
> John Falstaff wrote:
>
>> I understand Nikon Capture can convert the fisheye image from the 10.5mm
>> lens into a rectilinear one, but what focal length rectilinear lens does
>> that become equal to?
>>
>
> 10.5 mm

Okay, I'll rephrase the question.

What focal length rectilinear lens does that become equal to IN FIELD OF
VIEW, CORNER TO CORNER?

"John Falstaff" <> writes:

> "Hans S" <> wrote in message
> news:Xns97B0A286824E0lavachequirit@194.109.133.242 ...
> > John Falstaff wrote:
> >
> >> I understand Nikon Capture can convert the fisheye image from the 10.5mm
> >> lens into a rectilinear one, but what focal length rectilinear lens does
> >> that become equal to?
> >>
> >
> > 10.5 mm
>
> Okay, I'll rephrase the question.
>
> What focal length rectilinear lens does that become equal to IN FIELD OF
> VIEW, CORNER TO CORNER?

After cropping to a rectangle.
--
David Dyer-Bennet, <mailto:dd->, <http://www.dd-b.net/dd-b/>
RKBA: <http://www.dd-b.net/carry/>
Pics: <http://dd-b.lighthunters.net/> <http://www.dd-b.net/dd-b/SnapshotAlbum/>
Dragaera/Steven Brust: <http://dragaera.info/>

On 25 Apr 2006 12:44:15 -0500, in rec.photo.digital David Dyer-Bennet
<dd-> wrote:

>"John Falstaff" <> writes:
>
>> "Hans S" <> wrote in message
>> news:Xns97B0A286824E0lavachequirit@194.109.133.242 ...
>> > John Falstaff wrote:
>> >
>> >> I understand Nikon Capture can convert the fisheye image from the 10.5mm
>> >> lens into a rectilinear one, but what focal length rectilinear lens does
>> >> that become equal to?
>> >>
>> >
>> > 10.5 mm
>>
>> Okay, I'll rephrase the question.
>>
>> What focal length rectilinear lens does that become equal to IN FIELD OF
>> VIEW, CORNER TO CORNER?
>
>After cropping to a rectangle.


According to :
http://www.naturfotograf.com/lens_fish.html

120 degrees.
__________________________________________________ ______
Ed Ruf Lifetime AMA# 344007 ()
http://EdwardGRuf.com

"David Dyer-Bennet" <dd-> wrote in message
news:...
> "John Falstaff" <> writes:
>
>> "Hans S" <> wrote in message
>> news:Xns97B0A286824E0lavachequirit@194.109.133.242 ...
>> > John Falstaff wrote:
>> >
>> >> I understand Nikon Capture can convert the fisheye image from the
>> >> 10.5mm
>> >> lens into a rectilinear one, but what focal length rectilinear lens
>> >> does
>> >> that become equal to?
>> >>
>> >
>> > 10.5 mm
>>
>> Okay, I'll rephrase the question.
>>
>> What focal length rectilinear lens does that become equal to IN FIELD OF
>> VIEW, CORNER TO CORNER?
>
> After cropping to a rectangle.

I don't intend to crop anything. The sensor is already rectangular. If it's
not on the sensor, ipso facto it's not part of anything that matters.

"Ed Ruf" <> wrote in message
news:...
> On 25 Apr 2006 12:44:15 -0500, in rec.photo.digital David Dyer-Bennet
> <dd-> wrote:
>
>>"John Falstaff" <> writes:
>>
>>> "Hans S" <> wrote in message
>>> news:Xns97B0A286824E0lavachequirit@194.109.133.242 ...
>>> > John Falstaff wrote:
>>> >
>>> >> I understand Nikon Capture can convert the fisheye image from the
>>> >> 10.5mm
>>> >> lens into a rectilinear one, but what focal length rectilinear lens
>>> >> does
>>> >> that become equal to?
>>> >>
>>> >
>>> > 10.5 mm
>>>
>>> Okay, I'll rephrase the question.
>>>
>>> What focal length rectilinear lens does that become equal to IN FIELD OF
>>> VIEW, CORNER TO CORNER?
>>
>>After cropping to a rectangle.
>
>
> According to :
> http://www.naturfotograf.com/lens_fish.html
>
> 120 degrees.

Thank you!!

Wider than a 14mm lens on a 35, then. So Hans S was apparently right, and I
thought he was putting me on.

My abject apologies, Hans.

But now that 120 degrees looks wrong. I can see that Hans is right, a 10.5mm
fisheye "converts" to a 10.5mm rectilinear because the central part of the
image still has the same magnification and the corners are just stretched
out to suit. I should've thought of that in the first place.

But with the 1.5x focal length factor, that means equivalent to just under
16mm rectilinear on a 35, which wouldn't cover 120 degrees corner to corner.
A 14mm lens on a 35 covers only about 114 degrees. A 17mm covers about 104.
So somewhere between those two.

"John Falstaff" <> writes:

> "David Dyer-Bennet" <dd-> wrote in message
> news:...
> > "John Falstaff" <> writes:
> >
> >> "Hans S" <> wrote in message
> >> news:Xns97B0A286824E0lavachequirit@194.109.133.242 ...
> >> > John Falstaff wrote:
> >> >
> >> >> I understand Nikon Capture can convert the fisheye image from the
> >> >> 10.5mm
> >> >> lens into a rectilinear one, but what focal length rectilinear lens
> >> >> does
> >> >> that become equal to?
> >> >>
> >> >
> >> > 10.5 mm
> >>
> >> Okay, I'll rephrase the question.
> >>
> >> What focal length rectilinear lens does that become equal to IN FIELD OF
> >> VIEW, CORNER TO CORNER?
> >
> > After cropping to a rectangle.
>
> I don't intend to crop anything. The sensor is already rectangular. If it's
> not on the sensor, ipso facto it's not part of anything that matters.

If you de-fish the image as captured on the sensor, you will have a
wildly non-rectanglular result. What do you do with it then?
--
David Dyer-Bennet, <mailto:dd->, <http://www.dd-b.net/dd-b/>
RKBA: <http://www.dd-b.net/carry/>
Pics: <http://dd-b.lighthunters.net/> <http://www.dd-b.net/dd-b/SnapshotAlbum/>
Dragaera/Steven Brust: <http://dragaera.info/>

"David Dyer-Bennet" <dd-> wrote in message
news:...
> "John Falstaff" <> writes:
>
>> "David Dyer-Bennet" <dd-> wrote in message
>> news:...
>> > "John Falstaff" <> writes:
>> >
>> >> "Hans S" <> wrote in message
>> >> news:Xns97B0A286824E0lavachequirit@194.109.133.242 ...
>> >> > John Falstaff wrote:
>> >> >
>> >> >> I understand Nikon Capture can convert the fisheye image from the
>> >> >> 10.5mm
>> >> >> lens into a rectilinear one, but what focal length rectilinear lens
>> >> >> does
>> >> >> that become equal to?
>> >> >>
>> >> >
>> >> > 10.5 mm
>> >>
>> >> Okay, I'll rephrase the question.
>> >>
>> >> What focal length rectilinear lens does that become equal to IN FIELD
>> >> OF
>> >> VIEW, CORNER TO CORNER?
>> >
>> > After cropping to a rectangle.
>>
>> I don't intend to crop anything. The sensor is already rectangular. If
>> it's
>> not on the sensor, ipso facto it's not part of anything that matters.
>
> If you de-fish the image as captured on the sensor, you will have a
> wildly non-rectanglular result. What do you do with it then?

<chuckle>

You're right, of course. Brain only hitting on two cylinders today. Sorry.
Probably never should have switched to decaf.

Jack

"John Falstaff" <> wrote in message
news. ..
> I understand Nikon Capture can convert the fisheye image from the 10.5mm
> lens into a rectilinear one, but what focal length rectilinear lens does
> that become equal to?
>
>


NC gives an option to keep the parabolic areas on the top and bottom of the
corrected image. If you crop at greater than a 1.5:1 aspect ration, you can
get a 180deg panorama, so to speak. it's very hard for me to visualize what
I will get when I'm shooting, but the lens is great fun! I had to wipe dog
spit of my lens, I was able to get so close.