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12-08-2009, 06:58 AM   #1
Dom
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Have I stumbled upon a rare lens?

I looked up my newly acquired 'F 28-80 1:3.5-4.5' and I notice that it looks a little different to the one in the review database. having done some googling it looks like it could be a Takumar. All the info I can find says that this lens has 5 blades mine has 8. Also the labelling is different.

Here are some pics of said lens.




As you can see 8 blades not 5.




Serial number and Japan.


Any info will be most useful.

12-08-2009, 07:27 AM   #2
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IIRC, there were three types of Pentax lenses in the F generation. Some were Takumar-F, some were Pentax-F, and some were SMC Pentax-F.

As you can guess, only the SMC version has the flabled coatings, even though the others do have coatings.

Non SMC lenses have been called many names (doorstop comes to mind) but my own experience with two Takumar bayonet lenses tell me that these lenses can be really fine. Your lens is not rare as in "worth a lot of money" rare, but it might be uncommon. It would probably not fetch an amazing price on the marketplace, but the same can be said of most F and FA SMC kit lenses (like the 35-80s).
12-08-2009, 07:59 AM   #3
Dom
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I paid peanuts for it and I'd expacet that's what I'll get for it if I sell.
It's just I can't find any other examples with the 8 blades.
12-08-2009, 08:59 AM   #4
Dom
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Just looked my lens up on Pentax-F 28-80/3.5-4.5 and it says that it's got 6 blades.

Also looked up the Pentax-A 28-80/3.5-4.5 and that has the 8 blades. Walks away scratching head.

12-08-2009, 09:03 AM   #5
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QuoteOriginally posted by Dom Quote
I paid peanuts for it and I'd expacet that's what I'll get for it if I sell.
It's just I can't find any other examples with the 8 blades.
Maybe the peanuts you paid for where for the extra blades.
12-08-2009, 10:26 AM   #6
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Pentax started issuing the Takumar brand once again in the eighties. I have two. A Takumar 28 mm F 2.8 wide angle and a 50 mm Macro I bought both in around the mid eighties.

I used the 28 Takumar a lot and it was a great lens. Only diff I think between the tak and the Pentax was, as previous poster said...no SMC coatings.
12-08-2009, 10:34 AM   #7
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QuoteOriginally posted by Dom Quote
Just looked my lens up on Pentax-F 28-80/3.5-4.5 and it says that it's got 6 blades.

Also looked up the Pentax-A 28-80/3.5-4.5 and that has the 8 blades. Walks away scratching head.
FWIW, the FA 28-80 f/3.5-4.7 also has 8 blades.

What's the minumum focus distance on the scale of your lens ?
12-08-2009, 11:29 AM   #8
Dom
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QuoteOriginally posted by GerryL Quote
Maybe the peanuts you paid for where for the extra blades.
The 8 'peanut' blades hasn't hurt the bokeh in the slightest.

QuoteOriginally posted by RBellavance Quote
FWIW, the FA 28-80 f/3.5-4.7 also has 8 blades.

What's the minumum focus distance on the scale of your lens ?
Min focus 1m.

Walks away muttering "8 blades" under his breath and scratching his head.

12-08-2009, 11:45 AM   #9
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QuoteOriginally posted by Dom Quote
The 8 'peanut' blades hasn't hurt the bokeh in the slightest.



Min focus 1m.

Walks away muttering "8 blades" under his breath and scratching his head.
I have exactly the same lens in my hands now. 8 Blades and all. What's the big deal?
12-08-2009, 12:53 PM   #10
Dom
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QuoteOriginally posted by Asahiflex Quote
I have exactly the same lens in my hands now. 8 Blades and all. What's the big deal?
We now know that there two in existence.

Cool, I'm not the only one. I'm just trying to find out some information on it. I can't find it listed anywhere.

This also discounts my half brain theory that someone has altered my lens.
12-08-2009, 01:59 PM   #11
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Its listed by dimitrov but says it has 5 blades


F 28-80/3.5-4.5

Non SMC Pentax-F has 6 blades as odes the Takumar-F

Pentax-F 28-80/3.5-4.5

Last edited by Blue; 12-08-2009 at 02:05 PM.
12-08-2009, 02:22 PM   #12
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did Pentax every make a habit of using old versions as test models for the next gen features such as trying out 8-bladed apertures? Maybe near the end of the production life of this lenses it was used to beta/field test new features to be used in future lenses?

It might be realistic since the FA cousin/version has 8-blades.
12-09-2009, 04:07 AM   #13
Dom
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QuoteOriginally posted by Blue Quote
Its listed by dimitrov but says it has 5 blades


F 28-80/3.5-4.5

Non SMC Pentax-F has 6 blades as odes the Takumar-F

Pentax-F 28-80/3.5-4.5
Yes we had noticed.

QuoteOriginally posted by brecklundin Quote
did Pentax every make a habit of using old versions as test models for the next gen features such as trying out 8-bladed apertures? Maybe near the end of the production life of this lenses it was used to beta/field test new features to be used in future lenses?

It might be realistic since the FA cousin/version has 8-blades.
That is a very good question, I wonder how many of this version they made.
12-09-2009, 06:16 AM   #14
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I'll try to compare my non-SMC Pentax-F 28-80 against the FA 28-80 (which I also have).
12-09-2009, 09:31 AM   #15
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QuoteOriginally posted by brecklundin Quote
did Pentax every make a habit of using old versions as test models for the next gen features such as trying out 8-bladed apertures? Maybe near the end of the production life of this lenses it was used to beta/field test new features to be used in future lenses?

It might be realistic since the FA cousin/version has 8-blades.
They certainly did that sort of thing with camera bodies in the 60s.
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