K5 - IQ when zooming on the LCD

thoughton
Posted 12/01/2011 - 14:16 Link
After taking the first fews shots of a new subject I will often zoom in to 14x on the LCD to check my focus. On the K5 at 14x I can see a lot of jpeg 'jaggies' which I'm sure I didn't get on my K20D.

Can anyone else confirm this?
Tim
AF - Pentax K5, Sigma 10-20/4-5.6, Tamron 17-50/2.8, Sigma 30/1.4, Sigma 70-200/2.8, Tamron 70-300/4-5.6
MF - Vivitar CF 28/2.8, Tamron AD2 90/2.5, MTO 1000/11
Stuff - Metz 58 AF1, Cactus v4, Nikon SB24, Raynox 150, Sigma 1.4x TC, Sigma 2x TC, Kenko 2x macro TC, Redsnapper 283 tripod, iMac 27”, Macbook Pro 17”, iPad, iPhone 3G
FlickrFluidrPPGStreetPortfolio site
Feel free to edit any of my posted photos! If I post a photo for critique, I want brutal honesty. If you don't like it, please say so and tell me why!
GDN
Posted 12/01/2011 - 15:42 Link
What are you shooting Jpeg, Raw or Raw+? If it is only Raw then I think the camera saves a low size jpeg for review on the back of the camera, hence the 'jaggies'. If you shoot Raw+ you will zoom into the full size jpeg....
Gary

Pentax K3

My Flickr
thoughton
Posted 12/01/2011 - 15:51 Link
Interesting. I shoot Raw only, which was also how I shot on the K20D.

I just turned on RAW+ to see if it makes a difference, but unfortunately it doesn't I still get jaggies and loads of other visible jpeg artefacts at 14x. I'm pretty sure I didn't get these (at least not to the same extent) on the K20D.
Tim
AF - Pentax K5, Sigma 10-20/4-5.6, Tamron 17-50/2.8, Sigma 30/1.4, Sigma 70-200/2.8, Tamron 70-300/4-5.6
MF - Vivitar CF 28/2.8, Tamron AD2 90/2.5, MTO 1000/11
Stuff - Metz 58 AF1, Cactus v4, Nikon SB24, Raynox 150, Sigma 1.4x TC, Sigma 2x TC, Kenko 2x macro TC, Redsnapper 283 tripod, iMac 27”, Macbook Pro 17”, iPad, iPhone 3G
FlickrFluidrPPGStreetPortfolio site
Feel free to edit any of my posted photos! If I post a photo for critique, I want brutal honesty. If you don't like it, please say so and tell me why!
snappychappy
Posted 12/01/2011 - 15:57 Link
14X that's a pretty extreme zoom isn't it? I never zoom past 8X.
thoughton
Posted 12/01/2011 - 16:05 Link
snappychappy wrote:
14X that's a pretty extreme zoom isn't it?
Is it? I don't really know I posted a question on this forum about it a long while back, and apparently on the K20D 14x was approximately 1:1.
Tim
AF - Pentax K5, Sigma 10-20/4-5.6, Tamron 17-50/2.8, Sigma 30/1.4, Sigma 70-200/2.8, Tamron 70-300/4-5.6
MF - Vivitar CF 28/2.8, Tamron AD2 90/2.5, MTO 1000/11
Stuff - Metz 58 AF1, Cactus v4, Nikon SB24, Raynox 150, Sigma 1.4x TC, Sigma 2x TC, Kenko 2x macro TC, Redsnapper 283 tripod, iMac 27”, Macbook Pro 17”, iPad, iPhone 3G
FlickrFluidrPPGStreetPortfolio site
Feel free to edit any of my posted photos! If I post a photo for critique, I want brutal honesty. If you don't like it, please say so and tell me why!
Edited by thoughton: 12/01/2011 - 16:06
Pentaxophile
Posted 12/01/2011 - 17:45 Link
Noticed same thing on the K-7. Much crisper LCD image than my K200D, but zooming in on the screen is disappointing. On the K200D it was like zooming into the actual image on my computer, right up to 1:1, but with the K7 (as GDN suggests) it's as if you are blowing up a low resolution preview.
thoughton
Posted 12/01/2011 - 18:14 Link
Ah, that's interesting, thanks for that. It is a bit disappointing TBH, although I can just about see enough to judge if it's sharp or not, the blocky artefacts everywhere definitely don't make it easier.
Tim
AF - Pentax K5, Sigma 10-20/4-5.6, Tamron 17-50/2.8, Sigma 30/1.4, Sigma 70-200/2.8, Tamron 70-300/4-5.6
MF - Vivitar CF 28/2.8, Tamron AD2 90/2.5, MTO 1000/11
Stuff - Metz 58 AF1, Cactus v4, Nikon SB24, Raynox 150, Sigma 1.4x TC, Sigma 2x TC, Kenko 2x macro TC, Redsnapper 283 tripod, iMac 27”, Macbook Pro 17”, iPad, iPhone 3G
FlickrFluidrPPGStreetPortfolio site
Feel free to edit any of my posted photos! If I post a photo for critique, I want brutal honesty. If you don't like it, please say so and tell me why!
bretti_kivi
Posted 12/01/2011 - 19:35 Link
I do not trust the LCD to tell me if it's sharp or not on a K10D.

Zoom in with Live View before taking the shot.

Bret
my pics: link
my kit: K3, K5, K-01, DA 18-55, D-FA50 macro, Siggy 30/1.4, 100-300/f4, 70-200/2.8, Samsung 12-24/f4, Tamron 17-50, and lots of other bits.
thoughton
Posted 12/01/2011 - 22:04 Link
bretti_kivi wrote:
Zoom in with Live View before taking the shot.

Bret
I do - when I'm using a tripod
Tim
AF - Pentax K5, Sigma 10-20/4-5.6, Tamron 17-50/2.8, Sigma 30/1.4, Sigma 70-200/2.8, Tamron 70-300/4-5.6
MF - Vivitar CF 28/2.8, Tamron AD2 90/2.5, MTO 1000/11
Stuff - Metz 58 AF1, Cactus v4, Nikon SB24, Raynox 150, Sigma 1.4x TC, Sigma 2x TC, Kenko 2x macro TC, Redsnapper 283 tripod, iMac 27”, Macbook Pro 17”, iPad, iPhone 3G
FlickrFluidrPPGStreetPortfolio site
Feel free to edit any of my posted photos! If I post a photo for critique, I want brutal honesty. If you don't like it, please say so and tell me why!
Smeggypants
Posted 13/01/2011 - 03:02 Link
bretti_kivi wrote:
I do not trust the LCD to tell me if it's sharp or not on a K10D.

Zoom in with Live View before taking the shot.

Bret
Zooming in on Live view is very different to zooming in on a preview of an already taken shot though.

On my K20D zooming a taken shot isn't pixellated at all. Zooming on Live vierw is terrible and very 'blocky' - I'd heard this was fixed with the K-5


btw - The K10D doesn't have a Live View.
[i]Bodies: 1x K-5IIs, 2x K-5, Sony TX-5, Nokia 808
Lenses: Pentax DA 10-17mm ED(IF) Fish Eye, Pentax DA 14mm f/2.8, Sigma 17-70mm f/2.8, Pentax-A 28mm f/2.8, Sigma 30mm F1.4 EX DC, Pentax-A 50mm f/1.2, Pentax-A 50mm f/1.4, Pentax-FA 50mm f/1.4, Pentax-A 50mm f/1.7, Pentax DA* 50-135mm f/2.8, Sigma 135-400mm APO DG, and more ..
Flash: AF-540FGZ, Vivitar 283
bretti_kivi
Posted 13/01/2011 - 06:37 Link
I know. I've been using the LiveView technique with the 7D and it has helped an awful lot as stuff which looked "OK" on that LCD is in reality not as good as it should be.

Bret
my pics: link
my kit: K3, K5, K-01, DA 18-55, D-FA50 macro, Siggy 30/1.4, 100-300/f4, 70-200/2.8, Samsung 12-24/f4, Tamron 17-50, and lots of other bits.
Pentaxophile
Posted 13/01/2011 - 08:55 Link
Zooming in in live view on the k7 results in a massively pixellated image. There is however a noticeable change in contrast when the image snaps into focus. So it's useable but not ideal.
Tyr
Posted 13/01/2011 - 12:00 Link
On of the reasons for the difference is the K20D has a delta array layout for the pixels.

http://a.img-dpreview.com/reviews/nikond3/page3.asp

Look about half way down.

Delta arrays blur the image.
thoughton
Posted 13/01/2011 - 12:04 Link
That's interesting. So you think the blurriness disguised the jpeg artefacts? I suppose that's a possible explanation.

So the K5 has a stripe layout?
Tim
AF - Pentax K5, Sigma 10-20/4-5.6, Tamron 17-50/2.8, Sigma 30/1.4, Sigma 70-200/2.8, Tamron 70-300/4-5.6
MF - Vivitar CF 28/2.8, Tamron AD2 90/2.5, MTO 1000/11
Stuff - Metz 58 AF1, Cactus v4, Nikon SB24, Raynox 150, Sigma 1.4x TC, Sigma 2x TC, Kenko 2x macro TC, Redsnapper 283 tripod, iMac 27”, Macbook Pro 17”, iPad, iPhone 3G
FlickrFluidrPPGStreetPortfolio site
Feel free to edit any of my posted photos! If I post a photo for critique, I want brutal honesty. If you don't like it, please say so and tell me why!

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