[ptx] Getting EXIF data from coolpix 950 jpgs using hugin

[Glenn Barry]

Crop factor is the size of the CCD x A number to give 24mm x 36mm. 
Everything is still calculated relative to 35mm camera lens focal 
lengths in relation to 35mm film dimensions which are 24mm x 36mm.

Grab the CCD sensor size from your manual, determine what it needs to be 
multiplied by to give 24mm x 36mm and you've got your crop factor. You 
may not need this IF the exif tags are already giving effective focal 
length equivalents relative to 35mm film dimensions. I don't know much 
about exif tags so this last part may be totally wrong, but you should 
at least be able to understand the principles to know if I am.

Glenn

Kevin Hanser wrote:
> Quoting Pablo d'Angelo <pablo.dangelo at web.de>:
> 
>> Kevin Hanser schrieb:
>>
>>> Hello,
>>>
>>> I have just recently discovered and started using the following tools 
>>> to create
>>> panoramas:  autopano-sift, hugin, panotools (PTStitcher), and enblend.
>>>
>>> I have an old Nikon Coolpix 950 camera, and I have been unable to 
>>> automagically
>>> read the lens settings using the "load EXIF" feature of hugin.  When 
>>> I click on
>>> an image in hugin and pick "load EXIF", it then brings up a box 
>>> asking me for
>>> the focal length.  I've been putting this in manually for now and it 
>>> works
>>> good, but I'm curious as to why it isn't able to get the info from 
>>> the EXIF
>>> info in the jpgs?
>>
>>
>> Hugin also needs information about the pixel size, because without it,
>> the focal length is meaningless.
>>
>> Some camera do not save both in the EXIF data. Can you email me a
>> example image privately?
>>
>> ciao
>>  Pablo
>>
> 
> I think what I actually meant was the "crop factor".  I'm not entirely 
> sure how
> to determine this... I've been basing it on the F-stop and that seems to 
> work
> ok, but I'm not sure if that's correct or not.  I will send you an image
> shortly...
> 
> thx!
> 
> 
>