Go Back   Steve's Digicams Forums > Digicam Help > What Camera Should I Buy?

Reply
 
Thread Tools Search this Thread
Old Apr 1, 2007, 5:00 PM   #1
Junior Member
 
Join Date: Mar 2007
Posts: 19
Default

I visited a local camera shop looking at a G7 and then a D40X. The salesperson said the 6 megapixel D40X CCD would be able to produce better photos the the 10 megapixel G7. He said that the G7 could only produce up to an 8x10, where the D40X could produce postersize prints.

I guess I don't understand why the same image on a 6Mp sensor would look better then on a 10Mp sensor.

Yes, I'm also not sure if I should jump from from a digicam to a DSLR.

Biff
Biff vonMises is offline   Reply With Quote
Sponsored Links
Old Apr 1, 2007, 5:30 PM   #2
Senior Member
 
mtclimber's Avatar
 
Join Date: Oct 2005
Location: Oregon, USA
Posts: 18,143
Default

Biff-

The answer to your question is very easy to understand. The imager on the Nikon D-40 is manytimes larger than the imager on the Canon G-7. Therefore, the photosites on the imager are also much larger on the D-40. All of that simply adds up to much better resolution.

Even when reduced to the size required by the posting limitations you can still see the difference in this D-40 sample image.

MT/Sarah
Attached Images
 
mtclimber is offline   Reply With Quote
Old Apr 1, 2007, 5:36 PM   #3
Administrator
 
Join Date: Jun 2003
Location: Savannah, GA (USA)
Posts: 22,378
Default

Biff vonMises wrote:
Quote:
The salesperson said the 6 megapixel D40X CCD would be able to produce better photos the the 10 megapixel G7.
The Nikon D40X uses a Sony 10MP sensor. Are you sure that you were not discussing the Nikon D40 (which uses a Sony 6MP Sensor)?

That X at the end of the model number is what distinquishes the main difference between the the D40 and D40X. ;-)


JimC is offline   Reply With Quote
Old Apr 1, 2007, 6:28 PM   #4
Junior Member
 
Join Date: Mar 2007
Posts: 19
Default

He must have handed the wrong camera to me! I distinctly remember looking a the badge on the camera and seeing a D40X.

Since the 2 camera are approximately the same price (D40 & G7), is the D40 a better buy?

thanks!

BVM
Biff vonMises is offline   Reply With Quote
Old Apr 1, 2007, 7:19 PM   #5
Senior Member
 
mtclimber's Avatar
 
Join Date: Oct 2005
Location: Oregon, USA
Posts: 18,143
Default

Biff-

In that case, the D-40X image at 10mp would be even better than the image that I posted for you, which was from the D-40 at 6mp. Either way, the amswer remains the same. A larger imager is clearly capable of more resolution.

MT/Sarah
mtclimber is offline   Reply With Quote
Old Apr 1, 2007, 11:35 PM   #6
Senior Member
 
Join Date: Oct 2003
Location: Indian Rocks Beach, FL
Posts: 4,036
Default


It isn't necessarily true that larger sensors give better resolution. Dpreview uses standard resolution charts on most of their tests and there often isn't much difference between small and large sensor cameras of the same megapixels. This is despite using a prime (non-zoom) lens for the DSLR tests and using the best aperture for resolution. Some of the 8Mp prosumer cameras had resolutions at least as good as 8Mp DSLRs despite using zoom lenses and whatever aperture the camera choose.

The D40 didn't turn in resolution numbers nearly as good as the little Fuji F30 with the same 6Mp and a small 1/1.7 sensor as an example. And it certainly didn't have more resolution than the G7. You get better images with a large sensor because of noise and dynamic range, but the quality is somewhat independent of resolution. Based on Canon 10Mp DSLR images the D40X is probably going to turn in resolution numbers better than the G7, but not by an awful lot. I don't know whether the G7 isn't particularly good or 10Mp is starting to push the capabilities of small sensors.

6Mp Nikon D40


6Mp Fuji F30


10Mp Canon G7


The first numbers are absolute resolution and the second set the extinction resolution.
slipe is offline   Reply With Quote
Old Apr 2, 2007, 11:18 AM   #7
Senior Member
 
audioedge's Avatar
 
Join Date: Dec 2005
Posts: 254
Default

lol - numbers numbers... try controlling depth of field with those pocket sized digicams... then again, dont bother i know you cant
audioedge is offline   Reply With Quote
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 7:28 AM.