Saturday, October 23, 2010

G12 vs G9 Images: Sky, Grass, Telephoto


This is a sort of "for what it's worth" comparison -- and it may not be worth much but was easy to do.   The important aspect of these comparisons is they are probably representative of photos, settings and actions that a photographer might do with either the G9 or G12.  I made these shots while shooting the lake scene in the previous post.

In the photo above, I simply took a shot of the sky with the G12 in Av mode at f4.5, ISO 80 and zoomed all the way to telephoto.  The G12 selected a shutter speed of 1/640 second.  I did the same for the G9 but backed off the telephoto to somewhat duplicate the G12 focal length.  (Turns out I missed it.  The G12 shot is at 30.5mm, the G9 at 36.8mm.)  The G9 also selected 1/640 second.  I then cropped a 400 pixel x 400 pixel sample from the center of each of the in-camera JPEGs and pasted them side by side.  In addition to the G9 shot being slightly darker, it seems to me to have a "texture".  OK, so we're pixel peeping here but, still, I prefer the G12 sample.

Next, I repeated the experiment by photographing the grass.  The G9 was zoomed to its widest focal length of 7.4mm and set for f4 in Av mode; exposure was 1/320 second.  Although the G12 will go even wider (6.1mm), I tried to guess at 7.4mm (missed that one also -- actual setting was 8.1mm).  When set for f4, the G12 selected an exposure of 1/250 second.  The picture below shows the 100% crops side by side.  I thought the G9 might be a bit soft but it seems fine to me.  I'd accept either shot.

Next, I wanted to uprez the G12 telephoto to the same image size produced by the G9.  Recall that the G9 is has 12MP and 44.4mm telephoto as compared to the 10MP and 30.5mm telephoto of the G12.  I uprezzed the G12 telephoto shot from the previous post until the tree in the center of the G12 photo was the same size on my computer screen at 100% pixel view as was the G9 telephoto shot of the tree.  Then I cropped those 100% views and pasted them side by side as shown below.

The G12 does not come out so well in this comparison and I did not expect it to.  After all, "uprezzing" is a process of creating pixels where none existed previously.  If I'd thought to do so, I'd have used the digital zoom of the G12; however, the process I used is about the same (I think).  This side-by-side comparison shows that true optical zoom is better than digital zoom.  For scenes needing focal lengths longer than that of the G12, I'll be using the G9.

(I hope the differences show up as described after the posting process.  The JPEGs were saved at the highest setting in Photoshop.  You should be able to click on an image to see it full size.)

1 comment:

Eric Lawson said...

These are helpful and I for one appreciate the time you have spent on this for the community. As someone with a beloved G9 who is considering the update, I watch your posts closely.

Eric Lawson