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05-21-2010, 01:12 PM   #1
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Pentax K-x with Sigma lens

Hello,
I just got a Pentax K-x and need to know if I can use my old Sigma Mini-zoom 39-80 lens on it. It fits my Canon EOS slr and in tiny letters on the lens it say it's made for Nikon. Is it worth getting some kind of adapter or should I just buy a new lens. The K-x came with the 18-55 but I really want a zoom lens.
Thanks!

05-21-2010, 01:20 PM   #2
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The 18-55 is a zoom lens

If it's a canon-mount lens, it won't fit Pentax, and getting an adapter would be a waste, especially if it's an AF lens. If it's a screwmount or manual lens, adapting it would be more feasible, but I don't know the whereabouts of that. Could you post more information about this lens?

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05-21-2010, 01:29 PM   #3
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I guess I meant a "zoomier" zoom! Actually the sigma doesn't fit the canon either. Not sure where it came from.... However, I do have a Canon zoom EF 80-200 1:4.5-5.6 II. Can I make that fit my K-x?
05-21-2010, 01:37 PM   #4
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No, you can't. And now I'm going to quote someone on another forum:

QuoteQuote:
Why should you, anyway? Pentax has made better lenses than that
If you'd like a zoom in that range, consider the Pentax DA 50-200mm (it's even weather resistant) (see here: Pentax Lens Review Database - SMC Pentax-DA 50-200mm F4-5.6 ED WR Lens Reviews) or the F 70-210mm (see here: Pentax Lens Review Database - SMC Pentax-F 70-210mm F4-5.6 Lens Reviews).


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05-21-2010, 02:26 PM   #5
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"Cause I am trying to save money! I would love to buy the Pentax 50-200 but....is there a third-party lens that I could buy from ebay? What about a Vivitar zoom 70-210 mm F4-5.6 KA?
05-21-2010, 02:42 PM   #6
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Check here: PentaxForums.com Third-Party Lens Review Database - Lens Listings

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05-21-2010, 03:33 PM   #7
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QuoteOriginally posted by pinkphish Quote
"Cause I am trying to save money! I would love to buy the Pentax 50-200 but....is there a third-party lens that I could buy from ebay? What about a Vivitar zoom 70-210 mm F4-5.6 KA?
I agree with trying to save money, but in the world of lenses, it means sacrificing quality. Big time.

Also, unless the lens is very special, the balance sheet for cost and value doesn't make it worthwhile for a questionable, major conversion.

So save money...keep on saving it...to buy the good stuff.
05-21-2010, 07:39 PM   #8
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QuoteOriginally posted by pinkphish Quote
"Cause I am trying to save money! I would love to buy the Pentax 50-200 but....is there a third-party lens that I could buy from ebay? What about a Vivitar zoom 70-210 mm F4-5.6 KA?
You should have bought the 2 lenses kit , the second lens was costing less than any adapter you will find in the market

05-22-2010, 08:33 AM   #9
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There are quite a few (very , very, very many, actually) existing threads talking about the various inexpensive telephoto lenses (telephoto is the word you are looking for here, BTW, not zoom). The standard options are the 50-200 and the Tamron & Sigma 70-300's. Check out those many, many existing threads here and in the lens forum, also check the reivews, and decide for yourself. They are all fine lenses for the price and each has its fans. Note that any significantly cheaper lenses like the one you ask about are manual focus and because you can't set the focal length accurately in the SR menu, SR won't be as effective. I'd avoid those.
05-22-2010, 09:12 AM   #10
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Mate 50-200 is like $100 used in as new condition. Screaming bargain.
05-22-2010, 10:10 AM   #11
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QuoteOriginally posted by pinkphish Quote
"Cause I am trying to save money! I would love to buy the Pentax 50-200 but....is there a third-party lens that I could buy from ebay? What about a Vivitar zoom 70-210 mm F4-5.6 KA?
Look on eBay and here. Tamron, Sigma, Tokina, Quantaray, all sold 70-210mm range zoom lenses. As you are a beginner, I would recommend that you get one for Pentax Auto Focus, not manual focus. You can always manual focus an AF lens. I saw a Sigma 70-210 AF go for $39.00 recently. Set a budget for yourself, and keep watching ebay and here, something will turn up. These old lenses are just as good as new ones for learning composition and exposure. Be advised, these old lenses may not as sharp as the new lenses sold today, but they do work and they take a better picture than the one you didn't take because you didn't have a telephoto. In short, an old lens will allow you to learn your camera while you save up for a better one, and when you do get a better lens you can sell the old one on ebay and get most of money back.
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