Tamron SP 28-105/2.8 (176A)

Started May 9, 2009 | Discussions
Jim King
Jim King Veteran Member • Posts: 8,583
Tamron SP 28-105/2.8 (176A)

With the help of our forum colleague Frank in Singapore, I was recently able to acquire this lens to (almost) complete my collection of all the Tamron SP Adaptall-2 MF lenses. I'll have more to say on that subject in the future, but I wanted to share my first impressions of this lens and post some images, as it is not very commonly found.

First of all, it's big! It has a filter diameter of 82mm, weighs 880 gm, and is 87mm in diameter x 112mm long at its shortest (170mm extended).

The front element is 70mm in diameter!

Second, it's beautifully built, solid and with a smooth zoom action. One novel feature is a two-step zoom friction setting, rather than a simple zoom lock. It is heavy, but it balances fairly well on my K10D (not so well on my K-m...).

Third, it's a pretty good performer. On my K10D (which is set up for MF with a Katzeye split image screen), I found it very sharp even wide open at 28mm; at 50mm and 105 mm it is somewhat "dreamy" wide open but it sharpens up very nicely when closed down one to two stops. I like the bokeh; while it can be a little bit "nervous" in some situations it is a lot better than I've seen from some other zoom lenses I've used.

These representative images were shot in 4-star JPG quality on my K10D, adjusted for exposure, resized, and slightly sharpened in PP:

I especially like the bokeh in this last image - very smooth and creamy edges on the OOF white flowers in the background:

So that's my most recent lens acquisition. My last SP is on order now; it's the SP 90mm f2.8, which I already have in the Pentax AF mount version. The Adaptall-2 mount version has a different optical layout; it will be interesting to compare them. Stay tuned...
--
Jim King - Retired Colormonger - Suburban Detroit, Michigan, USA; GMT -4h (EDT)
Pentaxian for over 45 years.

* * * * *
A fanatic is one who can't change his mind and won't change the subject.

  • Sir Winston Churchill

* * * * *
The difference between genius and stupidity is that genius has its limits.

  • Albert Einstein

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Roentarre30 Veteran Member • Posts: 4,211
Re: Tamron SP 28-105/2.8 (176A)
JensR Forum Pro • Posts: 17,955
Re: Tamron SP 28-105/2.8 (176A)

Hi Jim!

What a behemoth. Looks like a very interesting lens and highly useable, if you can look past its huge size.
Do you have any plans for using it on film?

I like the bokeh; while it can be a little bit "nervous" in
some situations it is a lot better than I've seen from some other
zoom lenses I've used.

I would agree based on these samples.

My last SP is on order now; it's the SP 90mm f2.8,

Interesting, I would have thought that this is the most common lens in that family

Cheers
Jens

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'Well, 'Zooming with your feet' is usually a stupid thing as zoom rings are designed for hands.' (Me, 2006)
My Homepage: http://www.JensRoesner.de

Jim King
OP Jim King Veteran Member • Posts: 8,583
Re: Tamron SP 28-105/2.8 (176A)

JensR wrote:

Hi Jim!

What a behemoth. Looks like a very interesting lens and highly
useable, if you can look past its huge size.
Do you have any plans for using it on film?

Hi Jens - you are up late tonight!

Yes, I expect to use the Tamron SP lenses more on film than on digital, as their coatings tend to be a bit too reflective of the sensor, leading to flare spots. I have a large collection of Adaptall-2 mounts so I can use the lenses on just about any 35mm camera...

I like the bokeh; while it can be a little bit "nervous" in
some situations it is a lot better than I've seen from some other
zoom lenses I've used.

I would agree based on these samples.

My last SP is on order now; it's the SP 90mm f2.8,

Interesting, I would have thought that this is the most common lens
in that family

Actually the most common is the older 90mm f2.5, which came in two cosmetic versions (52B and the later 52BB). Over 100,000 of these were made between 1979 and 1996. The 90mm f2.8 (72B) was one of the last Adaptall lenses to be issued (1996) and was not discontinued until 2006 AFAIK. Even though 65,000 were made, it's unusual to find a used one for one for sale - probably because it is a darned good lens!
--
Jim King - Retired Colormonger - Suburban Detroit, Michigan, USA; GMT -4h (EDT)
Pentaxian for over 45 years.

* * * * *
A fanatic is one who can't change his mind and won't change the subject.

  • Sir Winston Churchill

* * * * *
The difference between genius and stupidity is that genius has its limits.

  • Albert Einstein

 Jim King's gear list:Jim King's gear list
Pentax K-3 Leica M10 Pentax MX-1 Fujifilm X30 Leica M9 +139 more
Jim King
OP Jim King Veteran Member • Posts: 8,583
Thanks, James (nt)
-- hide signature --

Jim King - Retired Colormonger - Suburban Detroit, Michigan, USA; GMT -4h (EDT)
Pentaxian for over 45 years.

* * * * *
A fanatic is one who can't change his mind and won't change the subject.

  • Sir Winston Churchill

* * * * *
The difference between genius and stupidity is that genius has its limits.

  • Albert Einstein

 Jim King's gear list:Jim King's gear list
Pentax K-3 Leica M10 Pentax MX-1 Fujifilm X30 Leica M9 +139 more
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