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View Full Version : I bought a tamron lens should it be sharp

magicpic
Dec-13-2007, 05:41 PM
I have a 20d and bought the tamron lens 17-50 2.8 and it is not sharp. the photos are soft. I got the lens from B & H...I would like to hear from someone that has this lens..Is there something wrong with the lens? hope to hear janis
Scott_Quier
Dec-13-2007, 05:52 PM
A couple of examples with EXIF data would help a lot in answering this question. But, in general, if technique is on then the photos should be reasonably sharp wide-open and even better as the aperture closes down - to a point.

So, give us some example shots!!
JimM
Dec-13-2007, 05:56 PM
I like this link to comare lenses. Since I have some I really like, I use this to better understand how others will compare to them...

http://www.photozone.de/active/survey/querylenstxt.jsp?filter=%22brand='Canon%20EF'%20OR %20brand='Sigma%20AF'%20OR%20brand='Tamron%20AF'%2 0or%20brand='Tokina%20AF'%20or%20brand='Vivitar%20 AF'%22


In case the other link is too huge:
Lens Comparison (http://www.photozone.de/active/survey/querylenstxt.jsp?filter=%22brand=%27Canon%20EF%27% 20OR%20brand=%27Sigma%20AF%27%20OR%20brand=%27Tamr on%20AF%27%20or%20brand=%27Tokina%20AF%27%20or%20b rand=%27Vivitar%20AF%27%22)
magicpic
Dec-13-2007, 06:04 PM
I like this link to comare lenses. Since I have some I really like, I use this to better understand how others will compare to them...

http://www.photozone.de/active/survey/querylenstxt.jsp?filter=%22brand='Canon%20EF'%20OR %20brand='Sigma%20AF'%20OR%20brand='Tamron%20AF'%2 0or%20brand='Tokina%20AF'%20or%20brand='Vivitar%20 AF'%22


In case the other link is too huge:
Lens Comparison (http://www.photozone.de/active/survey/querylenstxt.jsp?filter=%22brand=%27Canon%20EF%27% 20OR%20brand=%27Sigma%20AF%27%20OR%20brand=%27Tamr on%20AF%27%20or%20brand=%27Tokina%20AF%27%20or%20b rand=%27Vivitar%20AF%27%22)

taken with a 20d

http://widgetr.smugmug.com/photos/228114799-M.jpg

http://widgetr.smugmug.com/photos/228107978-M.jpg
ziggy53
Dec-13-2007, 06:36 PM
Janis,

At that size, they look fine.

We really, really need to see original images. Do you have any images at full size and resolution, preferably with no post-processing?
Tee Why
Dec-13-2007, 06:51 PM
Although small, the images look pretty sharp to me.
A section of a 100% crop may yield more information along with the shooting settings.
magicpic
Dec-13-2007, 07:18 PM
Janis,

At that size, they look fine.

We really, really need to see original images. Do you have any images at full size and resolution, preferably with no post-processing?

here are the photos from the tamron
http://widgetr.smugmug.com/photos/232088853-M.jpg

http://widgetr.smugmug.com/photos/232088944-M.jpg
z_28
Dec-13-2007, 07:24 PM
Original, rather means full size, unprocessed !

Anyway I don't see anything immediately wrong with posted pics.
magicpic
Dec-13-2007, 07:32 PM
[quote=z_28]Original, rather means full size, unprocessed !

Anyway I don't see anything immediately wrong with posted pics.[/quot


these are the orginal files..if they are not how do i get the orgianal files..thanks janis
z_28
Dec-13-2007, 07:45 PM
Are you really use 0.25 MP camera ?

Your originals are 600x400 only.
ziggy53
Dec-13-2007, 07:45 PM
Janis,

What resolution is the camera set at?
Are you shooting RAW?
How are you posting the images to your gallery?
Did you use a tripod?
What was the lighting setup for this shoot?
PineapplePhoto
Dec-13-2007, 08:46 PM
:rofl no comments...Are you really use 0.25 MP camera ?

Your originals are 600x400 only.
OsirisPhoto
Dec-14-2007, 01:28 AM
My word, those girls are a bit old for Santa's knee aren't they??

Oh, maybe one useful comment then... as well as the advice already given, try a direct comparison at home with a known 'good' lens, using a set scene, tripod, same camera / lens settings and constant lighting. That's what I do when I get a new lens... not as scientific as some lens reviewers.. but they aren't testing your copy. :D
magicpic
Dec-14-2007, 04:18 AM
[quote=Hyperbaric]My word, those girls are a bit old for Santa's knee aren't they??

Oh, maybe one useful comment then... as well as the advice already given, try a direct comparison at home with a known 'good' lens, using a set scene, tripod, same camera / lens settings and constant lighting. That's what I do when I get a new lens... not as scientific as some lens reviewers.. but they aren't testing your copy. :D[/quote

I am going to do the test this weekend..thanks janis