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05-01-2009, 09:57 AM   #1
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DA* 50-135mm owners, please help!

I need help from those of you who own this lens.

Could you please see if these shots are sharp or not for a DA*50-135mm?

Both are taken at f/2.8 and they are in original RAW file.
Just click on the link and it should be asking where to download the file to.

50mm/2.8

135mm/2.8

Thanks for the helps,

05-01-2009, 10:07 AM   #2
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The pictures are not as sharp as I expect it to be. This is not a good test if you have a slight BF issue since the $20bill and the floor is very shallow. I suggest you try something different; for example, using 3 cereal boxes lining them upright with one inch (closer or farther apart) to check for BF or FF.
05-01-2009, 12:46 PM   #3
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I will look at the pictures later tonight. I have the 50-135 and am very happy with it. I used it last weekend to take pictures of my children at f/2.8 and the pictures came out nicely.

I would add that you likely will not get the best results at the extreme ends of the lens. The "middleish" area will be best and likely will be sharper at 3.5 or 4.0--though, I know we don't buy 2.8 lenses to uses them at slower stops!!!

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05-01-2009, 01:09 PM   #4
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The 50mm seems to be ok.
The 135mm could be a little more sharp.
However, I have to say both pics were not a good testing method as aleonx3 already stated.

05-01-2009, 01:17 PM   #5
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50 looks ok 135 looks backfocused some. redo the test with the camera on manual focus. take several shots while SLIGHTLY changing the focus and pick the best one. then see if it is still "too soft"
05-01-2009, 01:31 PM   #6
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Looks like the lighting isn't helping.

I see you're in California--you might feel a lot better about this lens if you took it outside!
05-01-2009, 03:02 PM   #7
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Original Poster
Thank you!

Thank you for the quick reply guys!
Gosh, I'm so glad to have a nice forum like here!

BTW, these shots are not taken by me.
They are from somebody who want to sell me the lens.

The reason I'm asking is because I have no other DA* 50-135 to compare with.
So all of your opinion are more helpful since you've seen what a DA*50-135 is capable of.

I'll see if he can provide me with another better sample.
05-01-2009, 04:31 PM   #8
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QuoteOriginally posted by HermanLee Quote
Thank you for the quick reply guys!
Gosh, I'm so glad to have a nice forum like here!

BTW, these shots are not taken by me.
They are from somebody who want to sell me the lens.

The reason I'm asking is because I have no other DA* 50-135 to compare with.
So all of your opinion are more helpful since you've seen what a DA*50-135 is capable of.

I'll see if he can provide me with another better sample.
Here is one at 135mm f/2.8 if you want something to compare with.



100%
http://farm4.static.flickr.com/3521/3465319818_4c0bbe459d_o.jpg

05-01-2009, 09:07 PM   #9
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All of the other advice seems right on. I looked at the photos and agree a more structured test with staggered objects imaged from a horizontal viewpoint likely would be better. Also, remember there is a minimum focusing distance for the lens--I think it is a few feet.

Gregg
05-02-2009, 05:29 AM   #10
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Sometimes with mine I'll be bummed that what I thought I was focusing on isn't in focus. Then I'll tweak the focus a bit by hand after the af locks. The main problem I'm finding with my copy is that it isn't reading my mind as well as I'd like it too and I have to actually focus it myself. Then all is well with the focusing world. lol.
05-02-2009, 05:42 AM   #11
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QuoteOriginally posted by nah Quote
Here is one at 135mm f/2.8 if you want something to compare with.
Gorgeous colors and bokeh! Classic shot - looks like it just stopped raining and was still cloudy.

QuoteOriginally posted by mel Quote
Sometimes with mine I'll be bummed that what I thought I was focusing on isn't in focus. Then I'll tweak the focus a bit by hand after the af locks. The main problem I'm finding with my copy is that it isn't reading my mind as well as I'd like it too and I have to actually focus it myself. Then all is well with the focusing world. lol.
Thank the makers for "quick shift focusing" as I frequently run into the same "problem." The thing(s) I want in crisp focus are sometimes not high-contrast enough for the AF - plus the AF "zones" are huge!
05-02-2009, 05:54 AM   #12
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Answer to OP

QuoteOriginally posted by HermanLee Quote
BTW, these shots are not taken by me.
They are from somebody who want to sell me the lens.

The reason I'm asking is because I have no other DA* 50-135 to compare with.
So all of your opinion are more helpful since you've seen what a DA*50-135 is capable of.
The Pentax 50-135 is capable of quite a bit, but it isn't "magically sharp" if the focus is off or contrast and light are low, and the bokeh is only great at f/5.6 or below.

In general, it is a handy range for portraits and outdoor shots and not as big or heavy as other f/2.8 zooms. Build quality can be variable (ask the seller when it was bought and if the warranty still applies - though I don't know if it transfers), but the colors and bokeh are great and the focusing is silent, if a bit slow for SDM.

I'd ask the seller why they are selling it, and then be prepared to "get to know it" once you get it. Lenses are mass-produced items, so sometimes there are bad copies out there, but that's the risk with buying anything these days.
05-04-2009, 01:14 PM   #13
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Thanks, guys for the comparison shots and advices.

I finally went to camera store and they happened to have DA*50-135 and 16-50 in stock.
So I tried it on my K20D and the pictures were amazingly sharp especially at f/4.

The owner uses K10D, maybe that explains why the samples look a little bit soft?
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