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10-07-2010, 12:39 PM   #1
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Need suggestions about zoom lens for K7

Hi, I am a fresh man here and also fresh for DSLR, I bought a Pentax K7 and now I'm wondering can you guys provide me some suggestions that which zoom lens is better for everyday use. Pentax 16-45/4 ED, Pentax 17-70/4 AL IF, Pentax 18-250/ 3.5-6.3 ED or Sigma 17-70/ 2.8-4 Macro.

Thank you.

10-07-2010, 01:27 PM   #2
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Did you buy the K7 with the 18-55mm lens or just the body? When you say "everyday use" that's different for everyone. Some people like shooting portraits and closeups, others prefer landscapes or architecture.

If you have the kit lens, i'd suggest playing around with that for a bit. It's not a bad lens and it will help you learn what kind of zoom range or focal length you prefer shooting. Then from there you can get a better idea of the lenses to get from the ones you named.
10-07-2010, 01:35 PM   #3
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In my Sony days I had the elder Sigma 17-70 (2.8-4.5) and really liked it. I was sure that I'd get another when I came to Pentax.. yet I picked up the 16-45. I had always wanted to go a bit wider, and so far the loss of the tele end hasn't been a big deal to me, I can crop a 45mm image down if need be. The 16-45 gives excellent images and has the close-focus abilities that I liked on the 17-70. So if going wide is important that silly millimeter can make a large difference; if you tend not to shoot wide very often, a 17-70 is excellent.

I also owned Tamron's 18-250 and it was quite good, yet when I found a cheap 18-200 Sigma (Quantaray badge) I liked it more. Its size & weight were more suitable for long walks, IQ was too close to call, and I again managed without the upper end at tele.

In general the 17-70 was superior to the 18-200 or 18-250, but it's the age-old tradeoff: best IQ, or most versatile/convenient single lens? Only you can answer that, and your answer today might change after a couple of years of experience. I've found the 16-45 and 55-300 to be today's answer, for me.
10-07-2010, 01:39 PM   #4
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Welcome here blatfish.
The above recommendation is right on the money.
You may want to know what focal lengths you shoot most at or want to shoot at to help you make your decision - if one needs to be made at all.

Superzooms like the 18-250 are very versatile, but not the best for portraiture or low-light photography. For those two areas, you may also want to consider the DA* 16-50 or Tamron 28-75.

10-07-2010, 02:06 PM   #5
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Most of my everyday shooting is with DA*16-50 (it can get wet) at wide end and DA 55-300 (lot lighter than 60-250) on the long end.
10-07-2010, 02:23 PM   #6
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Welcome to the forum. You already received some good advice.

- If you bought the K-7 with the kit lens 18-55mm, it would make sense to complement it by a 50-200mm or 55-300 mm lens.

- If you bought the K-7 body only, the most versatile zoom is the DA18-250mm (Pentax DA18-250mm or Tamron 18-250mm, same lens). An alternative would be the Sigma 18-250mm OS HSM with the Pentax K-mount, but a little more pricy.

Ash pointed nicely that the only real weakness of the DA18-250mm is the low light. That is true with nearly all zooms.

In my case, I complemented my DA18-250mm with a fas prime lens (f 1.4). For example, around sunset, I would use the DA18-250mm until it is too dark for the 18-250mm and change lens to continue with the Nokton 58mm f1.4. It works very nicely....

Hope that the comment will help.
10-08-2010, 09:02 AM   #7
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Thank you for you guys's suggestion, I bought the K7 with the 18-55mm lens on it. I will keep it to learn how to use the zoom lens.
10-08-2010, 12:27 PM   #8
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Moved to lens forum.

10-08-2010, 12:40 PM   #9
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QuoteOriginally posted by blatfish Quote
Thank you for you guys's suggestion, I bought the K7 with the 18-55mm lens on it. I will keep it to learn how to use the zoom lens.
if you have the kit lens, this is a good start for general purpose use, but at some point you may outgrow it. Until that time, if you get the urge to aquire another lens, and depending on your photographic tastes, either go for a wider angle lens, i.e. 10-20 or 12-24mm, or a telepoto in the range of 50-200 or perhaps more.

What I would recommend, however, is to purchase good quality lenses because they will probably outlast your present camera. then if you want a better quality than the kit lens, look to upgrade it also. Do not worry too much about some focal length overlap, as this can be useful and can reduce the number of lens changes you make.

the long end is a much harder decision, depending on whether you pick a lens that is relitively slow, i.e. F4-5.6 or very fast (i.e. F2.8) the fast tele photo zooms are very very good quality lenses but expensive and heavy.

I personally would stay away from super zooms, like an 18-250 because if you really only want this range and don't ever plan on taking it off the camera, you can get better options for much less money with a "bridge camera' not just in terms of optics but features. an SLR is meant to use with interchangeable lenses. the superzooms are slow at all focal lengths and heavier than they need to be compared to a bridge camera
10-08-2010, 05:52 PM   #10
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I see that you posted that you wanted to buy a Sigma 17-70mm macro in the 'wanted items' section. Are you still looking to buy ths lens? I've got a brand new one for sale and PM you but haven't got any replies. Please tell me if yo're interested.

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