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-   -   To clear zoom or not to clear zoom (https://forums.steves-digicams.com/sony-alpha-dslr-konica-minolta-dslr-sony-slt-77/clear-zoom-not-clear-zoom-214646/)

Hawgwild May 16, 2015 10:46 PM

To clear zoom or not to clear zoom
 
3 Attachment(s)
The latest batch of Sony SLTs have a feature called "Clear Image Zoom". Sony uses a bit of trickery to get up to 2X zoom, with little or no IQ loss. From 2X to 4X (digital zoom), it's a different story. Anyway, the proof is always in the pudding, and I have done a very non-scientific test of the clear zoom and digital zoom.

All pictures contain exif, and all are straight out of the camera, resized for the forum.
These were all shot with a Sony 50 F1.4 lens, no flash, and hand held.

1) Lantana Camara No zoom.
Attachment 204526

2) Lantana Camara 2X Clear Image Zoom (100mm equivalent)
Attachment 204527

3) Lantana Camara 4X Digital (200mm equivalent)
Attachment 204528

Hawgwild May 16, 2015 10:51 PM

3 Attachment(s)
Next, a sunflower. Same lens, 50mm F1.4.

1) Sunflower, no zoom.
Attachment 204529

2) Sunflower, 2X Clear Image Zoom. (100mm equivalent).
Attachment 204530

3) Sunflower, 4X Digital Zoo.. (200mm equivalent).
Attachment 204531

Hawgwild May 16, 2015 11:02 PM

3 Attachment(s)
Last, but not least, the good old Trumpet Vine. Again, SOOC, no PP, just resize to forum standard.

1) Trumpet Vine, no zoom 50mm.
Attachment 204532

2) Trumpet Vine, 2X Clear Image Zoom. (100mm equivalent).
Attachment 204533

3) Trumpet Vine 4X Digital Zoom. (200mm equivalent).
Attachment 204534

Like I said, "very un-scientific", but I find it a somewhat usable feature every so often. Is it better or worse than cropping in PP? Who knows??? It's easier on the camera, and the results are probably about the same.

lomitamike May 19, 2015 10:34 AM

Hey Robert,

These don't appear too bad for a digital crop.
As for cropping in PP, that will always the better way to crop. After the fact will always give you more options composition wise.

Ozzie_Traveller May 19, 2015 3:28 PM

G'day mate

It certainly looks okay...

It might be something similar to the Panasonic 'Intelligent zoom' feature where the image is boosted by a factor of [I think] 1,7x when you drop resolution from max mpx to 50% mpx

Q- on the Sony, do you need to drop image size from "L" to "M" ??
Phil

Hawgwild May 19, 2015 5:54 PM

Quote:

Originally Posted by lomitamike (Post 1390320)
Hey Robert,

These don't appear too bad for a digital crop.
As for cropping in PP, that will always the better way to crop. After the fact will always give you more options composition wise.

Hi Mike. On some other forums, there were a lot of heated debate on this subject, but I think you're right. Where this might come in handy is for the person who has no imaging software that would give you a good crop. Not sure if I'm thinking this correctly. I have PSE11 and I think it would do at least as good a crop as the camera.

Hawgwild May 19, 2015 5:57 PM

Quote:

Originally Posted by Ozzie_Traveller (Post 1390333)
G'day mate

It certainly looks okay...

It might be something similar to the Panasonic 'Intelligent zoom' feature where the image is boosted by a factor of [I think] 1,7x when you drop resolution from max mpx to 50% mpx

Q- on the Sony, do you need to drop image size from "L" to "M" ??
Phil

Phil, Sony says in the manual that the 2X is lossless. The 4X is digital, so I'm sure at 100% you will see problems.

As far as dropping the image size, no.

lomitamike May 20, 2015 2:35 PM

Another persons take on clear zoom.
http://www.dyxum.com/dforum/clear-im...9.html#1361989

TCav May 24, 2015 4:54 PM

I was intrigued by the possibilities you raised by investigating the potential of Clear Image Zoom, and wondered how it compared with optical zoom, when shooting the same composition. I chose a target image that was flat and had fine detail throughout: A double-sheet of tabloid newsprint.

https://c2.staticflickr.com/6/5446/1...2a08f0e2_c.jpg

I shot it with my A58 and a 'Beercan'. I shot it at a focal length of 210 mm at f/5.6, f/8, and f/11. I then shot it at the same apertures, but at a focal length of 105 mm using Clear Image Zoom. All other camera settings were unchanged from shot to shot.

At f/5.6:
https://c2.staticflickr.com/6/5329/1...dfb3ea90_b.jpg

At f/8:
https://c2.staticflickr.com/6/5332/1...6aa303a1_b.jpg

At f/11:
https://c1.staticflickr.com/9/8884/1...f2c604f4_b.jpg

The image segments on top are from the center of the full image, and the bottom segments are from the corner. The image segments on the left were shot with the 'Beercan' at a focal length of 210 mm and no CIZ, and the image segments on the right were shot at 105 mm and full CIZ. (Those segments were all extracted from Fine 20MP JPEG images and stored in PNG files to prevent any further compression.)

The first thing I noticed was how sharp the 'Beercan' was in the corners. The difference between the corners and the centers were almost indistinguishable. The 'Beercan' is a very good lens, plus it's a 'Full Frame' lens, so it's likely to do will on an APS-C body, but how well it did surprised me.

The second thing I noticed was that the CIZ images were not as good as the unCIZ images, but they were better than I expected from a digital zoom.

I don't think I'll be using it a lot, but since the 'Beercan' is a 1:4 macro lens, CIZ turns it into a 1:2 macro. I also like how it expands the focus points. It certainly has potential.

Hawgwild May 24, 2015 11:52 PM

Well, I certainly am impressed by the results you got. I have to disagree on one minor point-I think the CIZ images seem sharper or more contrasty, I'm not sure which, especially in the corners. You're right, the Beercan is a fine lens. I wish it were a little lighter.

Your observation about the Beercan becoming a 420mm 1:2 macro got me thinking. Would a Tamron 70-300 1:2 macro become a 600mm 1:1 macro? I see more experimenting in my future! :)

Hawgwild May 25, 2015 12:03 AM

Quote:

Originally Posted by lomitamike (Post 1390365)
Another persons take on clear zoom.
http://www.dyxum.com/dforum/clear-im...9.html#1361989


Hi Mike. These guys are really checking the clear zoom out. One guy said it best "clear image zoom is simply an in camera crop and enlarge and no better than crop and enlarge in PP; worse probably seeing as it's a JPEG only option. Not saying it can't be used for the sake of convenience but I wouldn't go there for any "critical" shot.

For anything else, like snapshot type pictures (non-critical) the clear zoom might be an option. One drawback is, while you can crop an original, you can't un-crop one.

TCav May 25, 2015 3:42 PM

Spider on web - Shot with A58 and 'Beercan':
https://c1.staticflickr.com/9/8800/1...639795c0_c.jpg

Spider on web - Shot with A58 and 'Beercan' and CIZ:
https://c2.staticflickr.com/6/5443/1...10e78ed7_c.jpg

Both shots are available for your inspection at their full resolutions, unretouched, along with the Exif data, by clicking on them.

I'll say that the focus jumped around a lot while using the CIZ, so getting the shot was tougher.

Hawgwild May 25, 2015 10:23 PM

Your second spider looks good at 2X.

I find that, at 4X, I have to manually focus if shooting close up. At a distance, not a problem.

All my 4X shots of the above flowers were manually focused.

I wanted to do some more shooting today but the weather here was nasty most of the day.

TCav May 26, 2015 1:04 AM

The 2X shot was MF. AF was bouncing around a lot, so I turned it off, focused closest, and shot continuous as I moved ever so slightly back and forth. The shot I posted was the sharpest of the 12 I took.

Also, the metering mode was Center-weighted in the unCIZ shot, but Multi-Segment in the CIZ shot. I DID NOT change that. The camera did.

Hawgwild May 26, 2015 8:05 AM

Quote:

Originally Posted by TCav (Post 1390529)

Also, the metering mode was Center-weighted in the unCIZ shot, but Multi-Segment in the CIZ shot. I DID NOT change that. The camera did.

Well, that's interesting.

Streets Jul 23, 2015 11:03 AM

There are trade-offs in any kind of in camera image manipulation. My experience with "Clearview Zoom" is mixed. I ALWAYS seem to sense artifacts that are not there when the C.Z. is off. I prefer to crop the image and avoid C.Z.


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