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09-11-2014, 09:03 PM   #1
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Tamron 90mm SP BBAR Problem

Just got this lens today VIA Flee Bay ...

Anyhow , Is there a known issue with this lens and a flash ? ( Lens flare )









Is there a cure besides a bullet ?

---------- Post added 09-12-14 at 02:16 PM ----------

Apparently a sensor reflection problem ..
Light reflecting off the sensor back onto the back of the lens ?
Would tubes cure this ?


Last edited by old4570; 09-11-2014 at 09:16 PM.
09-11-2014, 09:22 PM   #2
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QuoteOriginally posted by old4570 Quote
Apparently a sensor reflection problem .. Light reflecting off the sensor back onto the back of the lens ? Would tubes cure this ?
Worth a try. Otherwise it seems like a sharp lens.
09-11-2014, 10:06 PM   #3
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On digital, there is a known tendency toward a blue haze at the image center. It depends on lighting.
09-11-2014, 10:26 PM   #4
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Hmmm , 36mm tube has minimized it ...
As long as the light is not to strong , it seems to work ..
But thats still annoying .. I wonder if it does it with all cameras , or if its just my K10 ?
I will have to try a K20 and see ..

Ok I took a series of photos , and for the most part the Macro tube works ( 36mm ) ...
Unfortunately when you push the zoom , and the light the blue dot appears ...
What a shame , I dont think this lens is going to make it as a working lens ...

https://www.pentaxforums.com/forums/177-macro-photography/272807-more-tamron-90-sp-bbar.html Link to the photos ...
It looks like the lens really was a legend , in the film days ..


Last edited by old4570; 09-11-2014 at 11:18 PM.
09-12-2014, 04:28 PM   #5
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QuoteOriginally posted by old4570 Quote
Apparently a sensor reflection problem ..
Light reflecting off the sensor back onto the back of the lens ?
Would tubes cure this ?
Yes, that sure looks like bounce-back off the sensor to the back of the lens. Yours is the first report I am aware of with that lens.


Steve

(...has an Auto-Rikenon 55/1.4 that casts a yellow spot...)
09-12-2014, 10:28 PM   #6
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QuoteOriginally posted by stevebrot Quote
Yes, that sure looks like bounce-back off the sensor to the back of the lens. Yours is the first report I am aware of with that lens.


Steve

(...has an Auto-Rikenon 55/1.4 that casts a yellow spot...)




I have heard it mentioned, Steve.
09-13-2014, 08:44 AM   #7
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Ok I tried all my converters ...
And it was actually worse ..
So looks like this lens will be relegated to curio ....
09-13-2014, 09:08 AM   #8
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That's the Adaptall macro? Yes, that is a known problem on digital -- apparently the rear element is quite flat and is very prone to reflection off the sensor. I've got a few old lenses that do that.

09-13-2014, 09:20 AM   #9
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The 36mm Macro tube minimized it , so if I maybe stack two 36mm Tubes , it might be a fix ?
Oh well , I will give that a try one day ... For now the lens can be part of my lens collection till I give it another go ...
09-13-2014, 10:15 AM   #10
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I use the Tamron 2X converter with this lens with no problems. Of course, you then have a 180mm macro. But I don't have a problem with the extra working room when needed.
09-13-2014, 10:21 AM   #11
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Here are two taken with flash. F16, Vivitar DF-283 flash, K200.Forgot to mention. Flash was in the hot shoe.
Attached Images
   

Last edited by wildlifephotog; 09-13-2014 at 10:27 AM.
09-13-2014, 11:50 AM   #12
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QuoteOriginally posted by civiletti Quote
I have heard it mentioned, Steve.
QuoteOriginally posted by vonBaloney Quote
That's the Adaptall macro? Yes, that is a known problem on digital -- apparently the rear element is quite flat and is very prone to reflection off the sensor. I've got a few old lenses that do that.
I wonder how it is with the matched 01F 2x adapter? (Required to get 1:1)


Steve

---------- Post added 09-13-14 at 11:55 AM ----------

QuoteOriginally posted by wildlifephotog Quote
I use the Tamron 2X converter with this lens with no problems.
Just saw this.


Steve
09-13-2014, 12:10 PM   #13
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I haven't had any issues with the matched 1:1 Extension, either, but I don't use flash often..
09-13-2014, 05:02 PM   #14
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I tried the = Tamron SP F System 2x Tele - Converter For P/K BBAR MC
And it didnt change anything .. As well all the other converters I have ...
Seems to work ok without a flash , but I use a flash ..
09-13-2014, 05:15 PM   #15
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You might try checking the angle of light from the flashes you use. If the subject is centered, you want any reflected light to miss the lens front. By adjusting the flash head angle you can make that reflection miss, yet still light your subject perfectly.

Or add a layer of diffuser to the flashes to soft the reflection.
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