zooming question

[alwayslooking]

Greetings all,

G3 specs indicate that at full optical zoom (4x) the image should be equivalent to a 140mm lense.

To me the image looks just like that of a typical 100mm 35 mm lense.

What's going on here?

I want my 40mm!

Thanks for you usual great advice!

Phil

[mahanee]

alwayslooking wrote:
Greetings all,

G3 specs indicate that at full optical zoom (4x) the image should be equivalent to a 140mm lense.

To me the image looks just like that of a typical 100mm 35 mm lense.

What's going on here?

I want my 40mm!

Thanks for you usual great advice!

Phil
wow ... really ???
how did u compare the results of 100mm Lens and 140 mm lens ??

show us some pics maybe ??? ^-^

[alwayslooking]

Thanks for your interest.

I was hoping someone out there could give me some good news but apparently nobody knows how to explain this.

What I did was zoom in fully with the G3 and simply studied what was actually in the frame (on the LCD Monitor).

Then I took the 35mm telephoto and (at the same distance) found that what was framed through the lense was almost exactly the same amount of info.

Maybe I should shoot some test shots as you suggested but I assume that what you see is what you get.


Phil

[Deckyon]

Do the test shots.

[alwayslooking]

deckyon wrote:
Do the test shots.


Thanks Brad

I just HATE using film anymore!

So, I'll just go with the flow.

[Tbel]

I'm not certain which way this will effect your comparison but keep in mind that what you see on your lcd and 35mm view finder are at different proportions. I believe you will see a wider field of view on the digital, though I'm not positive.

Can anyone confirm or refute this?

[Deckyon]

Without looking at the pictures side by side I can't make any judgements on this.

I understand about the film, though. Maybe go to a camera store, take the CF card and ask to try a D10 w/ the 140mm and do a test that way.

I did that when comparing a d10 to a 300d and g3 to g5.

Sorry if it does not seem to help, but without anything to look at and compare, I do not feel comfortable making a wild ass guess.

[CoolToolGuy]

One thing to keep in mind is that the proportions of the G3 are not the same as 35mm. I do not have my G3 with me as I type this (I can't bring it into the building where I work), but I believe the G3 produces an image that is a multiple of 640 x 480 pixels. That produces an image with a 4:3 ratio of length to height. A 35mm film immage is 36 x 24 mm, which is a 3:2 ratio. The images cannot be matched up, and that could be the difference.
I remember hearing this argument when the 6 x 4.5 (Mamiya) format came out and challenged the 6 x 6 (Haselblad) format and the 6 x 7 (Koni Omega) cameras. They all use the same film, and the same lens could potentially be used on each camera, but it would be considered a wide-angle on the Koni, a normal on the Haselblad, and a telephoto on the Mamiya. This concept may help you understand the crop factor on the digital SLRs (but I'm getting off on a tangent). I think the measurement of what the lens is equivalent to may be related to the corner-to-corner diagonal size of the image.
It may be useful to take horizontal and vertical shots of a target that can be measured. If you take landscapes it will be difficult to measure how much sky is in each shot.
Hope this helps.
Have Fun