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08-10-2009, 09:41 AM   #1
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Tamron or sigma

Hi,
I am considering buying a 300mm lens, to replace the Quantary 400, since I can't afford a K/400 right now.

I have found 2 lenses:

Sigma APO 75-300/4.5-5.6 # 1002198

Tamron Adaptall 2 SP 60-300mm f3.8-5.4

Are these any good, which one is the best, should I buy or not?

Thanks in advance

Pierre

08-10-2009, 09:48 AM   #2
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What is your budget?
08-10-2009, 09:55 AM   #3
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Budget would be around 150$ including taxes, duty & shipping

Pierre
08-10-2009, 10:39 AM   #4
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QuoteOriginally posted by pdophoto Quote
I have found 2 lenses:

Sigma APO 75-300/4.5-5.6 # 1002198

Tamron Adaptall 2 SP 60-300mm f3.8-5.4
Those are both pretty obscure choices, compared to the standard / ubiquitous 70-300's from both manufacturers. Has your research shown these to to be better?

08-10-2009, 11:02 AM   #5
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Hi Marc,

I like K type lenses and as you can see on my first post I would realy like to have a K/400 to fit with my other K lenses but....

Those are old manual lenses found on ebay, and I was wandering if I am throwing money away. If so I will wait happilly for a better budget.

I don't know a thing about those lenses, the description I gave is everything I have except that "THE SELLER SAYS" that they are in "EXCELENT CONDITION"


What are the "the standard / ubiquitous 70-300's"

Pierre
08-10-2009, 12:02 PM   #6
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Here's the standard/ubiquitous Sigma 70-300:

Amazon.com: Sigma 70-300mm f/4-5.6 DG APO Macro Telephoto Zoom Lens for Pentax and Samsung SLR Cameras: Electronics

Here's the standard/ubiquitous Tamron 70-300:

Amazon.com: Tamron AF 70-300mm f/4.0-5.6 Di LD Macro Zoom Lens for Pentax Digital SLR Cameras: Camera & Photo

Make sure the Sigma has DG APO in the title and make sure the Tamron has Di LD in the title. There are similar, earlier lenses from both manufacturers that aren't quite as good.
08-10-2009, 12:33 PM   #7
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HI,

Thanks for the info on the standard lenses, but they are not manual full format.

Maybe I should forget the would thing, wait for a better budget and buy a K/400

Thanks all for everything

Pierre
08-10-2009, 01:15 PM   #8
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QuoteOriginally posted by pdophoto Quote
. . . a K/400
Considered a Vivitar T4/TX or PK-mount 400/5.6?

https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/59416-fungus-comparison.html

provides a representative IQ shot.

H2

08-10-2009, 01:30 PM   #9
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pdophoto... I'm curious, what kind of camera do you have now? Do you have an older film Pentax? I'm just interested in your need for a full-frame lens.
08-10-2009, 02:57 PM   #10
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Pierre,

FWIW I own the Tamron 75-300/4-5.6 LD ($135 shipped @ Adorama) and find it performs rather well. This is the elder, conventional (for film) zoom.

I spent the morning 2 weekends back at a model plane fly-in and switched to it from my DA*50-135 to get some reach. Almost all (27) of the shots in this gallery were made with the lens.
08-10-2009, 03:49 PM   #11
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Hi again everyone,

I did not consider Vivitar because no one toled me they were any good.

From my younger years they were on the cheap side.

My camera kit is: a K200D with 2 kit lenses (18/55 & 50/200), Tamron 28mm f2.5 adaptall PK, SMC PENTAX 50mm f1.4, SMC PENTAX 135mm f3.5 , Super Takumar 55mm f1.8, Hanimex 135mm f2.8, modified mount (k) Nikon 135mm f3.5 & ACCURA IMADO 3X converter, Quantary 400mm f6.3, AF-360FGZ, adapters, rings,M42 bellow and a few other things.

As you can see I have 2 bad 400mm kits. The Nikon + 3x converter is not sharp, and as a CA problem and the QUANTARY as the biggest CA problem I have ever seen, as a mather of facts I would not sell this to my worse enemy.

What I am trying to achive is to have an approximative 400mm K type full frame lense. A few days ago I did not have the +350$ needed for the SMC PENTAX K/400 so I let it go...

So the Tamron is good and may be in my budget.

The Sigma is also in my budget but no one seems to know it.

Pierre
08-10-2009, 05:43 PM   #12
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QuoteOriginally posted by pdophoto Quote
HI,

Thanks for the info on the standard lenses, but they are not manual full format.
They are full format - they just feature coatings / designs that allow them to be used to greater advantage than other full format lenses on digital. Of course, they will also focus automatically on a body that supports that function, but that doesn't mean they can't be used manually as well.

So again, I can't really see any reason *not* to choose one of the currently available 70-300 lenses mentioned. For the same price as a questionable used model of the older ones you mention, you can get a very well-regarded brand new lens with warranty and everything that will also provide AF capability should you wish it some day, and better results on digital than an equivalent older design. they'll also communicate focal length to the SR system, something that older zooms generally do no. The only reason I can see to go out of your way to choose one of older lenses is if you know from experience or test results you've seen that one of these older lenses are actually better. Given that zoom technology has progressed quite a bit over the years, I'd be inclined to assume the opposite, though.
08-10-2009, 06:11 PM   #13
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Hi again Marc,

You are bringing very goog arguments to mind.

So I will wait for sometime to take a decision and consider a PRIME lens 300 or 400mm.


thank you very much for all your advice

Pierre
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