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Samsung Galaxy K Zoom review for S4 Zoom users

OP gavinfabl

13th September 2014, 07:12 PM   |  #201  
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Quote:
Originally Posted by genus

Very detailed analyzing

Hopefully it gives an idea when you can get away without tripod.

Quote:
Originally Posted by genus

My part is testing on portrait photography.. at which focal length is the best for taking portrait with Kzoom.

yes am interested in portraits too. the general range is 96 - 132mm this is 4.0 - 5.5x magnfication.

Best part of the zoom lens is in the middle of the focal length so 4.7 or 5.1x (20.7 - 22.4mm) or in 35mm speak (112 - 122mm)

Now, that is the theory and don't know whether k zoom gives more range here or not. Did not test this out yet.

If you noticed, Olaf on the k zoom flickr group put up some nice portraits of his kids.

Quote:
Originally Posted by genus

At wide open, equivalent 24mm, it is good for landscape shot, but not for portrait, due to len distortion, it only good if you want to take full body photo + scene background, or..special wide angle effect, eg: long leg.

Heh, yeah this is why you can't do portraits with fixed focal length smartphones, they are all around the 23-35mm range. Digital zoom cannot really fix this.

Quote:
Originally Posted by genus

I tested at 2.1x zoom, ~50mm, it is very good, without any distortion, and the subject vs background distance are almost as what we see naked eye.
At 2.8x zoom / 4.0x zoom, ~70mm / 85mm, good too, no distortion, but the background perspektive was change from 50mm, which is good if you want to eliminate background subject.
at 10x zoom, 240mm, not so recommend, the portrait become flat, but if you like, it is good too.

I have not figured out optimal distance of the subject to focal length yet.

half body head shot at 4x you are 2 meteres away.

Thing with portraits is you have to pick your background carefully otherwise it will interfere with the subject.

Quote:
Originally Posted by genus

The only thing left for Kzoom is small sensor & limited aperture size (not large enough), small sensor give large crop factor effect (compare to APS-C / full frame sensor), small aperture give not enough DOF effect for portrait.

Yes there is too much DOF.

K-zoom's lens characteristics are different to what the usual calculators give for lens of a given focal length. Need to find one that takes crop factor into account.

eg. at 10x a lens of focal length of 44mm with aperture F6,3 should give DOF of 4cm if subject is 1 meter away. But when i did a little test DOF was like 3 metres behind subject.

and then you can close the f-stop all the way down to F18.4 at 10x and increase DOF further by 3x (!)

The aperture i wish could go larger than 3.1 as it would make isolation easier. Would crop factor (5.6x for k zoom) negate this if they make a 2.8 lens ?

But it increases as focal length like any cheap zoom. And that maybe is the thing here, to keep apertures large i don't know if its possible to do in such a small form factor or it will increase the cost a lot due to optics.
Last edited by One Twelve; 13th September 2014 at 07:18 PM.
16th September 2014, 09:58 AM   |  #202  
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Quote:
Originally Posted by One Twelve

Hopefully it gives an idea when you can get away without tripod.


yes am interested in portraits too. the general range is 96 - 132mm this is 4.0 - 5.5x magnfication.

Best part of the zoom lens is in the middle of the focal length so 4.7 or 5.1x (20.7 - 22.4mm) or in 35mm speak (112 - 122mm)

Now, that is the theory and don't know whether k zoom gives more range here or not. Did not test this out yet.

If you noticed, Olaf on the k zoom flickr group put up some nice portraits of his kids.


Heh, yeah this is why you can't do portraits with fixed focal length smartphones, they are all around the 23-35mm range. Digital zoom cannot really fix this.


I have not figured out optimal distance of the subject to focal length yet.

half body head shot at 4x you are 2 meteres away.

Thing with portraits is you have to pick your background carefully otherwise it will interfere with the subject.


Yes there is too much DOF.

K-zoom's lens characteristics are different to what the usual calculators give for lens of a given focal length. Need to find one that takes crop factor into account.

eg. at 10x a lens of focal length of 44mm with aperture F6,3 should give DOF of 4cm if subject is 1 meter away. But when i did a little test DOF was like 3 metres behind subject.

and then you can close the f-stop all the way down to F18.4 at 10x and increase DOF further by 3x (!)

The aperture i wish could go larger than 3.1 as it would make isolation easier. Would crop factor (5.6x for k zoom) negate this if they make a 2.8 lens ?

But it increases as focal length like any cheap zoom. And that maybe is the thing here, to keep apertures large i don't know if its possible to do in such a small form factor or it will increase the cost a lot due to optics.

Well there is a panasonic phone with a larger sensor http://www.panasonic.com/de/corporat...a-DMC-CM1.html but it got no optical zoom or xenon flash, fixed 28mm and kinda bulkier since it doesnt have the curvature shape of the k zoom. Its also double the price and not out yet. So not really a competitor to k zoom series. (would be nice to have 1 inch sensor with 10x optical zoom in 2cm thickness but k zoom 2 will never have that).
But maybe it will encourage microsoft to launch a 1020 successor.
16th September 2014, 04:17 PM   |  #203  
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Quote:
Originally Posted by Xdenwarrior

Well there is a panasonic phone with a larger sensor http://www.panasonic.com/de/corporat...a-DMC-CM1.html but it got no optical zoom or xenon flash, fixed 28mm and kinda bulkier since it doesnt have the curvature shape of the k zoom. Its also double the price and not out yet. So not really a competitor to k zoom series. (would be nice to have 1 inch sensor with 10x optical zoom in 2cm thickness but k zoom 2 will never have that).
But maybe it will encourage microsoft to launch a 1020 successor.

Panasonic Lumix Smart Camera - wihtout OIS, Xenon flash, fixed focal length at 28mm
But it have large sensor 1", variable aperture setting, M/P/A mode are very nice step if Lumix have 5x optical zoom + OIS, this will be best.

From my point of view, I still prefer Kzoom, as optical zoom help me take a lot of great photo using the advantage of the focal length from 24 -240mm, and the help of OIS


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18th September 2014, 01:25 AM   |  #204  
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Quote:
Originally Posted by genus



[]

Maybe you can try pano stich with these views.

Take a few and join to make a super high res one. With some zoom too.
7th November 2014, 01:39 AM   |  #205  
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Quote:
Originally Posted by gavinfabl

As an ex S4 Zoom owner, I now have the K Zoom, and at the moment there is no dedicated thread. I've written quite a bit about the K Zoom since I've got it on Saturday.

Link to review and my 7 part S4 review http://gavinsgadgets.wordpress.com/?...+K+Zoom+review

Part 3 of the K Zoom is up tomorrow. If you click on any part of the review you will also see a link to the expanding K Zoom flickr set. Part 3 is a big part with camera specifics.

If you any questions I will answer them here.

The only bit I miss on the K Zoom from the S4 Zoom is the tripod mount is missing on the K Zoom. Otherwise , the K Zoom is better in every way.

Anyway, fire away any questions.

Hi, did you get any dust in the K Zoom's lens like with the S4 Zoom?
7th November 2014, 09:26 AM   |  #206  
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Quote:
Originally Posted by Ramsey

Hi, did you get any dust in the K Zoom's lens like with the S4 Zoom?

No i didnt but i did have it in a case. A few of my friends who had the KZoom did suffer from dust and sent theirs back to Samsung for an exchange.
7th November 2014, 01:49 PM   |  #207  
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Quote:
Originally Posted by gavinfabl

No i didnt but i did have it in a case. A few of my friends who had the KZoom did suffer from dust and sent theirs back to Samsung for an exchange.

Thanks for your answer! It's saddening that Samsung did not fix this.
Anyways I was thinking of getting this for my wife but instead I went for the Samsung NX Mini since she didn't want a hybrid but a normal camera lol.
16th November 2014, 01:27 PM   |  #208  
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Protruding Zoom Lens
This is the most active Galaxy K Zoom community I've found online so I'll post my question here:

I dropped my K Zoom and now my optical zoom lens does not retract flush all the way - it protrudes out 2mm from it's original position.

Has anyone else encountered this unfortunate predicament? Does anyone know a fix?
23rd November 2014, 11:37 AM   |  #209  
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Just a heads up . Here is my link to my 26 part review of the K Zoom. https://gavinsgadgets.wordpress.com/...6-part-review/

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