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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 26 Apr 2009 (Sunday) 15:20
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Diagnose my Tamron please

 
SUB1IM388
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Apr 26, 2009 15:20 |  #1

So here is the thing i got the 17-50 about a week ago and so far im not happy, the images seem soft. It may be user error cause im no expert but no matter what i dont get tack sharp images. i used a focusing test sheet and everything seems fine (it my first time using one) so im leaning toward my incompitance but maybe its more then that here are the tests at F2.8 at each focal length (sorry i dont know how to show 100% views) i would post a picture of something wide open but most of my shots like i said are crap tell me if my lens is how it should be judging by the chart please.

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Cashoo
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Apr 26, 2009 15:22 |  #2

Post some shots of it in action.


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Anke
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Apr 26, 2009 15:23 |  #3

Chart looks fine, post your "crap" shots, it'll be much easier to put your mind at rest that way.


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SUB1IM388
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Apr 26, 2009 18:13 as a reply to  @ Anke's post |  #4

This one is the best image i got so far but how can you mess this up? BTW i had to sharpen the hell out of it just so i can kinda like it (i was just testing it out so dont mind the words shown) focused on the diamond

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took this last night some sharpening f/2.8 iso 400 1/50sec
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this was a few days ago with good light and decent shutter speed
f/8 1/90th sec iso 100
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DreDaze
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Apr 26, 2009 18:19 |  #5

SUB1IM388 wrote in post #7808433 (external link)
this was a few days ago with good light and decent shutter speed
f/8 1/90th sec iso 100


1/90 is not a decent shutter speed for kids...also the other kid shot was at 1/50...also not really ideal for kids

1/50 might not even account for camera shake if you go by the 1.6X FL factor it should be about 1/80

post some of the shots where you are really dissapointed...

here's how to do 100% crop in DPP...https://photography-on-the.net/forum/showthre​ad.php?t=497533


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SUB1IM388
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Apr 26, 2009 18:37 as a reply to  @ DreDaze's post |  #6

ok shutter speed noted but in this one SS was 1/200sec ISO 100 @ f/4.0
it seems soft to me i expect alot more. maybe too much? the imag i would get from my L blows me away as far as detail goes but thats not what i expect from the tamron i just want more then what im getting

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red ­ snapper
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Apr 26, 2009 19:01 |  #7

To be honest the last image seems quite sharp. I think the main problem with it is the harsh flash. The first set didn't seem too bad except for a little camera shake etc and you seem to have missed a focal point with the ring. Were you inside the minimum focusing disatance? Did you use your tripod? Remember F2.8 only gives you a wafer thin DOF.


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SUB1IM388
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Apr 26, 2009 19:14 as a reply to  @ red snapper's post |  #8

on the ring shot it was on a tripod in the minimum focusing distance and for the last shot yeah its better but i still expect more detail in the eye at f.4 i agree the flash was harsh but could that take away from detail?




  
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bohdank
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Apr 26, 2009 19:44 |  #9

At this point, I would bet it's poor technique.

First shots, slow shutter speeds or trying to focus on a diamond which has spectral reflections and very low light that no focusing system can handle well.

The last shot. What did you focus on, and did you recompose, after. Whay was your shooting distance. Did she stay perfectly still between focusing and taking the shot. Did you stay perfectly still ?

It actually looks quite sharp, excusing the limitations of downsampling and small web images.


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snakekid
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Apr 26, 2009 20:03 as a reply to  @ bohdank's post |  #10

My tamron 17-50 2.8 sharpness is about the same as yours but moving it up one notch to 3.2 makes its ALOT better


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SUB1IM388
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Apr 26, 2009 20:18 as a reply to  @ snakekid's post |  #11

ok ill go and take some more pictures maybe ill warm up to it




  
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blssdwlf
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Apr 26, 2009 21:55 |  #12

Out of curiosity, but what are you using to process your photos and what sharpening are you doing?

On my Tamron 17-50, if I use Canon DPP, I usually don't go above Sharpness 3 (default). On Adobe Photoshop CS3, I leave it on default Sharpening Amt 25 / Radius 1 / Detail 25 / Mask 0.

I might run a USM or Smart sharpen after resize on some for prints, though.

As dredaze and bohdank have pointed out, you are shooting kids at a SS that might not be fast enough to stop them completely. The diamond surrounded by contrasty rings, etc also could be harder to focus on because of the reflections plus at the closer FL, your AF point is much larger making it hard to get exactly what you want in focus. For macro stuff, I'd suggest getting close with AF and switch to MF and use Live View to fine tune if you have it.


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SUB1IM388
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Apr 26, 2009 22:02 as a reply to  @ blssdwlf's post |  #13

ill use lightroom 2 and the sharpness varries depending on the image should there be a sertain number for each lens???




  
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spicesupreme
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Apr 27, 2009 00:57 |  #14

does your lens have this problem? http://www.youtube.com​/watch?v=hlwTK-Ac0yI (external link)

mine did and my pictures were also soft so i sent it in to tamron. now the images are way better




  
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TweakMDS
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Apr 27, 2009 05:42 |  #15

About the opening post... You should really get those shots done from a tripod, and make sure the paper is aligned perfectly straight. Do one from up close (about twice the MFD) and one from a bit further away (a room length).
I have the Tamron, and it's razor sharp, but it does have trouble focusing in low light. Maybe try again with a LOT more light - or overexpose it slightly.

Eventually, take a few shots, and compare the AF shots with a live-view-zoom manual focus. There's a difference between the shots taken with AF and the MF shots, you have something to tell the Tamron techs. if they are identical, but still soft, it's very well possible that one of the inner elements is not aligned and you should send it in eitherway, but still add your conclusions with the focus chart (to rule that out).


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Diagnose my Tamron please
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