Perhaps the lens is sharper than we thought??

Started 11 months ago | Discussions thread
Jon_T
Jon_T Veteran Member • Posts: 5,015
Using Images Downsample to small useless as to IQ
1

ANAYV wrote:

Speaking of the FZ80....I'm now wondering if the lens isn't the weakest link in this feature rich, but I.Q. limited camera?

Here's two images taken more recently...the first yesterday , second from last month, both shooting RAW and using DXO PhotoLabs 2 with PRIME NR:

..

I think there's plenty of details in these images...so perhaps the sensor is really the main issue with this camera. ...

As usual a great captures, that you do very well at.

Good for display viewing but the small size limits print size to around
4.8" x 3.6" @ 300 DPI.

As to determining camera/ lens image quality not really, for two basic reasons:

1. Re-sampling:
When re-sampling image downsampled or upsampled (aka digital zoom), the image is a 'new version' of the camera image that's created by the re-sampling process used. Depending upon the re-sampling and JPG quality setting used, a downsampled image will usually 'look' better than the full size.

Following are excerpts from: Image Resampling1Written by Jonathan SachsCopyright © 2001 Digital Light & ColorImage Resampling (direct link to PDF HERE )

" ... Resampling is the mathematical technique used to create a new version of the image with a different width and/or height in pixels.

Increasing the size of an image is called upsampling; reducing its size is called downsampling.

When images are upsampled, the number of pixels increases, but, with reference to the original subject, new image detail cannot be created that was not already present in the original image. As a result, images normally become softer the more they are enlarged since the amount of information per pixel goes down.

When images are downsampled, information in the original image has to be dis-carded to make the image smaller. Thus if you downsample and then upsample an image, you will not get all the original image detail back.

Downsampling a soft image can make it appear sharper even though it contains less information than the original. ..."

There are many online articles on image re-sampling.

Several simple examples showing difference between FZ80 full size images downsized to 1440 x 1080; all the downsized images 'look' noticeably better as image noise, edge softness, color aberrations, etc. are also greatly reduced/ not visible.

DPR Studio Comparison Tool 800 ISO; Full Size

DPR Studio Comparison Tool 800 ISO; 1440 x 1080

All the lens resolution test items in the above DPR Studio Comparison Tool shot are useless in the small downsampled image.

CameraLabs FZ82/ FZ80 Review 1600 ISO; Full Size

CameraLabs FZ82/ FZ80 Review 1600 ISO; 1440 x 1080

Imaging Resource FZ80 Review 80 ISO; Full Size

Imaging Resource FZ80 Review 80 ISO; 1440 x 1080

If you can fill the image area like your second image above, good lighting, and low ISO, yes you can capture fur/ hair fine details. But as the subject fills less of the image area, the fine details become softer.

Imaging Resource FZ80 Review 80 ISO PP RAW w/ DxO PhotoLab 3; Full Size

Even with my own shots there are times PP FZ80 RAW files do not improve IQ all that much.

As with other 1/2.3" 18MP+ sensor cameras, FZ80 does not bode well in cloudy/ gloomy lighting conditions.

Cloudy/ Gloomy Day ISO 80, Full Size

Cloudy/ Gloomy Day ISO 80, 1440 x 1080

2. Target Size and Camera to Target Distance

1. Technically the only way to 'correctly' determine camera/ lens image quality is using the established procedures, as to target size and distance from the target for focal length being used. Via some searches one can easily find numerous sites, tutorials, etc. that explain how test camera/ lens image quality; e.g., one HERE.

In addition to proper distance from target/ subject distance need to examine the FULL SIZE IMAGE (i.e., NOT RESAMPLED), preferably RAW.

Sorry, but using subject distance and zoom to 'FILL' image area with subject is not a accurate representation of camera/ lens image quality.

As you have shown many, many times, with 'many' different cameras just about any camera/ lens, in the right hands, can provide in good looking images with #1 above, and to 'FILL' image area with subject.

Yes under the right conditions the FZ80 'can' provide (as I noted in older post HERE). However in comparing the FZ80 within the 24-600mm EFL RAW images to FZ200 RAW images, 'overall' the FZ200 images were 'consistently' better; especially at 400+ ISO's which one will need in less than good daylight due to the small pixel size and small tele focal lengths max apertures.

Which no surprise to those who understand that the FZ80's pixel area size is 1.56µm2 vs. FZ200 pixel area size of 2.34µm2; each FZ200 pixel has a 49% larger pixel area, larger area more light (protons) per pixel; hence less image noise per pixel.

Again images are great captures, good for display viewing, but not for determining camera/ lens IQ.

Cheers,
Jon

 Jon_T's gear list:Jon_T's gear list
Panasonic Lumix DMC-FZ200 Canon PowerShot G15 Canon PowerShot SX50 HS Canon PowerShot S110 Panasonic FZ1000 +15 more
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