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Old Oct 11, 2009, 10:48 PM   #11
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Could this effect be tricking the light meter, or perhaps decreasing the contrast so it looks "paler"?
No, it's not happening with Bootneck3's lens becasue his is a newer lens that has coatings that prevent that type of flare.

Are you asking about whether that might be happening with Bootneck3's lens, or are you asking for help with your issue?

I'm still not clear why you posted here if any attempt to answer your question meets with your wrath and ridicule.
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Old Oct 12, 2009, 3:11 AM   #12
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No, it's not happening with Bootneck3's lens because his is a newer lens that has coatings that prevent that type of flare.

Are you asking about whether that might be happening with Bootneck3's lens, or are you asking for help with your issue?

I'm still not clear why you posted here if any attempt to answer your question meets with your wrath and ridicule.
I was asking Bootneck if his lens had a flat rear element, since it wasn't clear which Tamron 90mm F2.8 lens he had.

If he had a similar lens to mine, then the spot could be contributing to his problem.

I know and understand the issue with my lens.
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Old Oct 12, 2009, 5:33 AM   #13
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Hi dnas.

As suggested by TCav my new f2.8 90mm lens is a "Di" and on inspection shows a concave rear lens.

No spots as shown on your pictures are evident.

After the discussions, I would like to add that I am very pleased with the lens and it certainly is an improvement on my 18-250 for close up work. But the 18-250 remains my No 1

Fred
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Old Oct 12, 2009, 7:27 AM   #14
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Ok, so there still no idea about the exposure problem then?
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Old Oct 12, 2009, 8:11 AM   #15
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Ok, so there still no idea about the exposure problem then?
See

Tamron f2.8 90mm tests

and

90mm lens test continued
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