What is the current equivalent to the G15 in it's day?

0lf wrote:

Greynerd wrote:

0lf wrote:

Geodude wrote:

According to DPR, the G7X and G5X do in fact go to 100mm! See link above!

100mm is just the min FoV where you have the full sensor 20Mpixel definition and 1" active diagonal.

In fact, as you can see written on the lens, optically the G15 goes to 30,5mm and the G7/5x goes to 36,8mm. Then, it is just the 4.59x crop factor due to the 1/1.7" sensor size that make the 30,5mm G15 lens having the FoV of a 140mm lens. Apply the same logic to the G7/5x with a 3.53x crop factor and you obtain a 130mm like FoV, with still 12Mpixel remaining and a larger 1/1.3" active sensor size than the G15.

So, because the G7/5x sensor is larger and has more definition, the difference in reach between those two cameras should be minimal.

BTW, you can have the exact same reasoning with the G9x, which can reach 110mm like FoV at the S120 sensor resolution

But the 1" sensor lens has a much larger aperture (I mean aperture not f number) which is pushing the optics in such a small collapsing lens so you have to consider how the lens is resolving things. I would not necessarily assume the 1" cameras crop down to the same detail as the 1/1.7" ones.

The difference in aperture is not that large :

• 30.5/2.8 = 10.89mm for the G15
• 36.8/2.8 = 13.14mm for the G7/5x (21% more)

Plus, pixels are larger on the 1" sensor (~30% in size), so the lens does not need to have as much resolving power as with the 1/1.7" to output a picture with the same level of detail.

Plus, by cropping you only use the central portion of the projected image, where resolving power is max

Plus, resolving power of the G7/5x lens is very good at 36,8mm when stopped down a bit (at least on my two samples of the lens)

Thanks for the detailed explanation 😎