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GXR A12 28mm vs. GRD III

becauseitsnice

becauseitsnice

New Member
Joined
Jul 2, 2010
Messages
93
when i bought the a12 28mm. i assume that i will get better quality picture than the grd III. but i guess, it seems, the quality of the pictures from the two are not much of a big differences. what do you guys think ?
 

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Hi!
I too have the A12 28mm, but only the GX100, not the GRDIII to compare it with. From this experience I would suggest that the two images are actually very different. This is because the DoF is vast on the GRDIII image, whilst the A12 unit is really quite shallow (due to the f 3.5 aperture performance/sensor driven variations). When I look at the plastic bin liner and the back of the chair in the A12 image, I see a substantial improvement in image quality, imho. However, at a glance, the GRDIII image has an overall sharper look, just because most of the image is in reasonable focus.
Not sure if this helps? You probably knew all that anyway! :lol:
Cheers!
Andy
 
I agree with Andy but to me the difference on my monitor is hard to see. For my purposes the big advantage of the GRD III is that is always in my pocket, while the GXR is available only when I am carrying the complete kit. When messing with the photos from each, the bigger sensor definitely allows me more futzing to tune the image the way I want. The smaller sensor does allow more DOF for the the same f stop but that is not the whole story.
Best
Peter

PS for a lovely confusing discussion of DOF and sensor size go to

http://www.luminous-landscape.com/forum ... opic=10934
 
i've been having trouble with focusing. actually i don't know how to do it... period. whether it's with the grd or gxr or my nikon/canon.

the two pictures above is the same and im sitting at the same spot. how come one picture has everything in focus, and the other one only has the chair in focus?

how do i, at a distant of where i sitting, get everything in focus. i autofocus most all the time and sometimes, the camera only picks 1 subject to be the main focus. so can someone teach me how to get everything in focus at any distant i wish, and vice versa: only 1 subject in focus.

im still new to photography, please excuse my amatuer questions.
 
dang, i have a lot to learn. it's going to take me a minute or two to figure out how to use DOF calculator. thanks bertalan.
 
becauseitsnice":cx0b854n said:
i've been having trouble with focusing. actually i don't know how to do it... period. whether it's with the grd or gxr or my nikon/canon.
Click to expand...
Hi! :)
It might also help if you try setting your GXR with A12 28mm attached to aperture priority mode on the top dial, and MF on the focus option menu. As you then turn the focus ring on the lens barrel, you can see from the little focus graphic on the lower left hand side of the screen what will be in focus and what not (shown by the green part on the bar)...this changes as you change the aperture, so you should visually be able to see roughly what will be in focus and what not for any given aperture. The smaller (larger number) apertures given you more in focus (i.e. greater depth of field). This has the advantage of allowing you to isolate a subject, say from its background (something hard to do with the GRD unless you are using macro, I suspect). The disadvantage is that in low light, there is a very shallow depth of field, i.e. there is very little depth to the region of sharp focus from front to back.
Hope I have not confused things further...not really my area of expertise! :?
All the best,
Andy
 
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