[ptx] HFOV, focal distance...

[Brian Innes]

Didier Hérisson wrote:

>Le Mercredi 1 Juin 2005 21:23, manouchk a écrit :
>  
>
>>Le Lundi 30 Mai 2005 08:55, Emmanuel a écrit :
>>    
>>
>>>Hi,
>>>
>>>I'd like to know if providing a good value of the HFOV is sufficient to
>>>do a good stitching in hugin or if it is needed to adjust well the focal
>>>length and cropping ?
>>>      
>>>
>>As noone seems to know the answer of my previous question, I ask my
>>question in another way, what is the cropping factor?
>>
>>    
>>
>
>Isn't it the ratio between the CCD and a 35mm detector? In the case of reflex 
>(SLR?) cameras, people think about focales length instead of HFOV, with the 
>35mm standard size in mind. My guess is, HFOV is calculated from focal length 
>by Hugin, assuming a standard 24*36mm detector. 
>If you know the '35mm equivalent' of your focal length, just put it as focal 
>length and a cropping factor of 1.
>  
>

Doesn't the '35 mm' equivelant focal length appear in the exif tags of 
the images taken with Olympus cameras?

For my Olympus C5000, it has a sensor size of 7.18 x 5.32 mm, which 
gives a diagonal of 8.94mm, giving a crop factor of 4.84 (43.3 / sensor 
diagonal size)

-- 
Brian


		
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