s100 zoom 28-400 eq??? I think 135 eq.....

[maxthewildcat]

Hi, I have a s100fs bridge;

when I compared the maximum focal lenght with a traditional 70-210 mounted on an old pentax 35mm, I have seen that the zoom factor of this 70-210 is very bigger than the s100 at max lenght, I think the real zoom eq. is 135mm, but the official web page reports :

Lens focal length
f=7.1mm - 101.5mm, Equivalent to 28 - 400mm on a 35mm camera

what do you think?

thanks

 

[Kim Letkeman]

Hi, I have a s100fs bridge;

when I compared the maximum focal lenght with a traditional 70-210 mounted on an old pentax 35mm, I have seen that the zoom factor of this 70-210 is very bigger than the s100 at max lenght, I think the real zoom eq. is 135mm, but the official web page reports :

Lens focal length
f=7.1mm - 101.5mm, Equivalent to 28 - 400mm on a 35mm camera

what do you think?

When you say "an old Pentax 35mm" I presume you mean film and full frame. Which means that the 70-210mm at max zoom will be 210mm ... if you mount that lense on a new Pentax dSLR, the 1.5x crop factor will make it effectively 210*1.5 == 315mm ...

The S100fs, on the other hand, has a crop factor around 4, which means that its 101mm lense shoots at effectively 404mm give or take a bit ...

I don;t quite understand your assertion ... but if your magnification is coming out on the Fuji just short of double the magnification on the Pentax, then all is right with the universe.

Perhaps you should just post links to originals at full zoom from both cams, shot from the same spot. We can quickly tell you what is going on ...

--
http://letkeman.net/Photos
http://kimletkeman.blogspot.com

 

[maxthewildcat]

I'm sorry,
yes, the old pentax is a film srl 35mm full frame....

now I can't scan the picture from Pentax film, but I have re-created with a crop in photoshop exactly what I can see in the comparison between the picture printed from pentax film and the images from s100 raf

links:





I re-scaled images just to decrease the kbytes weight....

 

[maxthewildcat]

the first is picture from fuji s100 at maximum focal lenght (400 mm eq);

the second is the "simulation" of the picture printed from pentax film 35mm shooted with a 70-210 at maximum focal lenght.....

my question is:

if my lens fuji is 400mm eq, why the image at maximum focal lenght is zoomed minus than a real 210mm?

sorry for my bad english, I'm writing from Italy.... ;-)

 

[Kim Letkeman]

Whoah ... I just read your second post ... which reverses what I thought I was seeing.

You took that from a print, and the lab was free to crop the print somewhat and magnofy it (they always did to make sure they did not get white stripes), but I never heard of that level of cropping that a 210mm lense comes out much larger than a 400mm lense (35mm equivalents of course) ...

This is not a good comparison at all ... you have no idea how that print was made and it certainly is not in the right proportions at all ...

You need to shoot your 70-210mm lense on a modern dSLR against the S100fs to see what the difference really is ... but I can assure you that the focal lengths are accurate enough ... the print is the issue here ...

--
http://letkeman.net/Photos
http://kimletkeman.blogspot.com

 

[maxthewildcat]

Well ... you took that from a print, and the lab was free to crop the print somewhat (they always did to make sure they did not get white stripes), so I don't think this is a good comparison ...

ah, ok, thank you for the explanation,

but when I looked directly through the viewfinder of pentax I have seen the image with a big % of zoom-in respect to the same scene through the viewfinder (or liveview screen) of my s100.....