Hi Markus,
I'm really sorry to hear that.
This is your lens, right?
http://jfcampbell.us/photo/tamron70-150sf.htm
The Pentax lenses are really simple, with no open aperture lever - it
just stops down to whatever f-stop you select. The smaller the aperture,
the darker your viewfinder (and of course less soft focus). It sounds
like the Tamron uses a floating element ("shifting the relay lens") to
adjust the spherical aberration. Hard to think of a reason why that
would affect exposure though. Keep us informed about the prognosis.
Haven't had a chance to use the 6x7 120mm yet, but I will soon.
D
Markus Maurer wrote:
Hi Mike
Fuji Superia ISO 100 color negative film was used and there is simply
nothing exposed on the negative = blank, empty when I used soft focus at
F2.8 or F4.
The beginning and rest of the roll is fine since I did not use the soft
focus ring there.
Something must be wrong with that lens.
greetings
Markus
-----Original Message-----
From: mike wilson [mailto:[EMAIL PROTECTED]
Sent: Saturday, May 06, 2006 12:41 PM
To: [email protected]
Subject: Re: OT:Tamron Soft focus problem
Markus Maurer wrote:
Hi Derby and anybody else interested :-)
I got the film back from the lab today and sadly every shot
(around 20) I
took with the soft focus ring engaged on the SP Tamron 2.8
70-150mm portrait
soft focus lens just produced a blank negative.
What do you mean by "blank"? Neg or slide?
The other shots without the soft focus are really good.
The zoom seems to be defective regarding the soft focus feature.
Any ideas what went wrong?
I will soon get a second sample of this lens from an auction to
test that
feature again.
greetings
Markus
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