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Preview: Tamron SP 15-30mm f/2.8 Di VC USD


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#21 mst

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Posted 27 October 2016 - 12:18 AM

As a follow-up to the earlier discussion about flare tests:
 
This is a selection of shots I made while field-testing the Tamron.
 
First scene, shooting into the sun, partly covered by the building in the shot.
 
Attached File  MST_2795_s.jpg   564.31KB   0 downloads
 
As you can see, there are some flare blobs both on the building (near the sun) as well as in the foreground.
 
Attached File  MST_2795_1.jpg   456.78KB   0 downloads
 
Attached File  MST_2795_2.jpg   249.88KB   0 downloads
 
Plus a few tiny spots near the image center.
 
Attached File  MST_2795_3.jpg   129.8KB   0 downloads
 
 
Now let's turn the setup by 90 degrees:
 
Attached File  MST_2796_s.jpg   699.45KB   0 downloads

 

Gives us very similar flare results, a reddish shape on the building plus a huge green blob in the foreground. Both roughly in the center of the image.

 

Attached File  MST_2796_1.jpg   368.51KB   0 downloads

 

Attached File  MST_2796_2.jpg   346.84KB   0 downloads

 

 

Now let's move the light source a little to the left:

 

Attached File  MST_2797_s.jpg   606.59KB   0 downloads

 

More or less same results, but now quite a bit apart, the red spot moving with the light source, the green blob moving in the opposite direction:

 

Attached File  MST_2797_1.jpg   303.87KB   0 downloads

 

Attached File  MST_2797_2.jpg   387.09KB   0 downloads

 

 

Same lens, different location, but roughly similar light setup: shooting directly into the sun, more or less centered.

 

Portrait mode:

 

Attached File  MST_2828_s.jpg   260.48KB   0 downloads

 

Surprise: no huge blobs, just some tiny, but colourful spots in the image center:

 

Attached File  MST_2828_1.jpg   89.83KB   0 downloads

 

Let's switch to landscape mode:

 

Attached File  MST_2829_s.jpg   274.31KB   0 downloads

 

Flares in this one? Nope.

 

(Well, ok, maybe there are, but might have ended up in places where there is no dark structure, so they're just not visible)

 

So, to summarize: you can see with these shots how different flare can be with the same lens (and at the same settings in all of the above shots, which is 15mm f/8), even with a roughly similar lightsource. I can't imagine any way to set up a test scenario that first of all offers the same and reproducible lighting conditions (outdoor??) and in addition gives meaningful results that can be compared between several tested lenses.

 

-- Markus


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#22 JoJu

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Posted 27 October 2016 - 06:48 AM

I'll do now the easy part and suggest and indoor test setting, but as I know from my own little equivalence comparsion (which tells a very much different story than the one from people using tables, DoF calculators and normal calculators), the work load is pretty high.

 

However, a dark room indoors situation with a strong light source (these days LEDs draw a lot of lumen out of a couple of watts) would be my setting. I think of the long walkway in our cellar...

tripod and geared head the basis for some reproducible angles at alway the same focal length. Not the expensive Arca-Swiss crap which is only geared in two orientations (that goes for the cube as well, shame). It needs a Gitzo Athena, second hand you could get one for say 5 grand? Just because it has digital angle scale and you could do the rotation and tilt by the laptop... also it looks very good. Highly professional...

 

And here comes the weak spot of the plan: It is dull beyond brain death and nobody will ever find the same conditions in nature, meaning this tests will consume a lot of lifetime of somebody and has to be called useless. The only thing it could do is find out with a lot of effort, how much flares are shown.

 

Flare is a downside of a lens, true, and I say that as user of THE flare collector 14-24/2.8. But there are also good ways to get that out of a picture. So, if a picture is at first "ruined" by flare* I'm better off by thinking how much other great shots the lens already gave me and bite the lemon, use some time to separate the frequencies and bring it down.

 

* which will only distract yourself and a couple of buddies of forums and photoclubs who still write the word "flair" - forget about them, if they see flare at first, the next thing they do is pixel, first counting then peeping, just a preparation to zip the equivalence calculators out of the pocket.


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#23 Rover

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Posted 27 October 2016 - 03:49 PM

Flare is a downside of a lens, true, and I say that as user of THE flare collector 14-24/2.8.

THE flare collector is officially called a different name... the Sigma 14mm f/2.8. I can scarcely imagine a lens that would be more prone to flare than that. :)



#24 GoldRingNikkor

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Posted 27 October 2016 - 04:14 PM

Thanks for the follow-up Markus. I see the problem.






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