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Help with AF Test on Tamron 28-75 and XT (1 image)
Hi,.

First, I am new to Digital Photography. I just bought the Tamron 28-75 mm lens for my Canon Rebel XT after reading lots of good review on it. I read that sometimes you get bad copy of the lens and the pictures wont turn out sharp..

I have been reading and followed Tutorial on AF test with the lens..

Since I am not expert in this field, I am hoping someone can help and tell me if there is any problem with my lens. I felt that it is not sharp enough at the focus point, but that maybe because of me..

Here is the photo of the AF test..

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Unfortunately flicker only allow 1024 x 858 max size. there is slight resize.this is how the photo is taken.Rebel XT, Tamron 28-75mm, Aperture f/2.8, Shutter Speed 1/2000 sec, ISO 400(Set to AV and focus on the center).

Thanks in advance...

Comments (5)

Here is another test..

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Comment #1

Go shoot some real pictures..

Seriously, why are you doing this? Have you noticed any problems with the lens when you actually use it? If you don't know what these tests mean, what is the point of doing them? Did you put it on a tripod? Did you use a remote release? Have you sharpened the result? What settings for the Jpeg?.

Lots of variables to consider yet. Or, you could just go shoot some real pictures..

Nothing is enough for the man to whom nothing is enough...

Comment #2

Took few real pictures but I have gotten better result with the stock canon lens that come with the rebel xt. With the Tamron pictures are not very consistent and I feel that the sharpness is not sharp enough compared to the stock canon lens. probably because I am new to this lens and the whole SLR thing or I just don't know how to take photo..

Photo of the test taken following the directions from various sites that I get the tutorial from. Using tripod, no sharperning, picture taken with timer, not remote..

Reason for testing is that I just want to be sure that it is not a bad batch and since I just own this for 3 days, I still have time to return it if there is a problem with the lens..

If someone can shed some light or provide some samples of how sharp the photo should be on the focus point on different light settings (original size) that would be great...

Comment #3

The test you have conducted is not very useful for judging sharpness. It is designed to find out if the lens is focusing properly, so it is impossible to tell you if the lens is sharp from those images..

Without looking at many different images of many different things shot with many different lens settings, it is not possible to judge the quality of a lens. Almost all lenses are good at some settings, and almost all lenses are weak in some areas. Show us a portfolio of 20 shots with the lens taken at various f-stops and distances and focal lengths, and maybe we can help you decide. Without that, you are the only one who can make the decision about whether the lens is good enough for you..

Lastly, the reports of "bad copies" are vastly over done. Most of those reports are made by people who cannot differentiate user error from equipment problems. You very likely have a good lens. Just use it..

Nothing is enough for the man to whom nothing is enough...

Comment #4

Thank you for your advice. Will go crazy and take lots of photos..

Cheers,..

Comment #5

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This question was taken from a support group/message board and re-posted here so others can learn from it.

 

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