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11-03-2009, 04:11 AM   #1
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Want to buy a K-x...but not sure about the lenses

Hi,

I'm looking for my first SLR for quite some months now, and the new k-x is the first affordable camera to have what I really want: good high ISO and fast burst speed.

But really dont't know what lenses to buy...before k-x I was looking to another brand's camera, and the kit with 18-105 and 70-300 was quite perfect for my needs...but pentax doesn't have the same offer.

For the tele-zoom, the 55-300 is a good choice, mas I can't find good alternatives for the 18-100mm range. The 17-70mm /4 is the close you can get, but it's quite expensive (although is a very good lens).

I really like the k-x, but the Pentax lenses offer is not quite as good as other brands ( I hope I dont't get flamed by saying this)...there are really good lenses, but those are very expensive.

Can I get some opinions about this?

Thanks!

11-03-2009, 04:12 AM   #2
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Look at Sigma 17-70 or Pentax 16-45.
11-03-2009, 05:59 AM   #3
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Could also match the 18-55 kit lens with the 55-300... gives you coverage from 18 through 300.... and is probably your least expensive option. (I would also expect it to measure up favourably vs the 18-105... dont know any details but would imagine... its a low cost lens with a large zoom range... I expect there are many design sacrifices made to do this...)

I have the 18-55 ALII kit lens which came with my K20D (in addition to a 50-135), Is a great lens for the price... and as a Kit lens I am sure you can pick them up at a good price 2nd hand (can also get new from Amazon.co.uk for around 80)...
I would like to upgrade (16-50) going forward but more because I value the 2mm extra at the low end, weather resistant and F2.8)
... as I understand however the Kx normally ships with a 18-55 L (L for lightweight)... I have never seen it in person but understand its more plastic than the ALII or the WR which ships with the K7.
11-03-2009, 06:17 AM   #4
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How about the Sigma 18-125mm F3.5-5.6 DC ? It's the about same price as the 18-105 from the "other" brand that you are considering. Then team that up with the Pentax 55-300, and your good to go.

Personally, I think that you'll like the pentax 18-55 with the 55-300, and my second choice would be the Sigma 17-70 plus the 55-300. But If you want the wider lens to have some more range, then the 18-125 is another option.

11-03-2009, 06:40 AM   #5
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QuoteOriginally posted by Pretender Quote
I really like the k-x, but the Pentax lenses offer is not quite as good as other brands ( I hope I dont't get flamed by saying this)...there are really good lenses, but those are very expensive.
I guess "other brands" is really Nikon here, because I don't know of anyone else who offer an inexpensive 18-105 lens. Their 18-105 is very convenient and good value for the money, but it's probably (I haven't tried it myself) not a stellar lens, and the Pentax 18-55 is probably better (at least less distorted) at the wide end.

So why not start with the 18-55 + 55-300 combo? I don't know to what extent the K-x is packaged with these two lenses in different markets, but at least in Japan you can buy it as a "double zoom kit". Kits with 18-55 are often just marginally more expensive than the body only, so you can't really go wrong.

And since it's your first SLR, you then buy some time to figure out what you really want to invest some money in. Maybe you get infected with the Pentax Limited Prime lens disease? Maybe you find out that the 18-55 is good enough for daily use, but your real interest is in superwide, so you want to buy the Pentax 12-24?

Or maybe you just decide to buy the 17-70, but you may still want to keep the 18-55 for the times you need a really lightweight combo. I use mainly the 16-45 myself, and it's a wonderful lens, but it's somewhat quirky with its reverse zooming and its limited usability with the built-in flash, so it may not be the best choice for a beginner.
11-03-2009, 06:48 AM   #6
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The K-x kits look to me to be good values--especially the 18-55/55-300--with only slight hesitation about a plastic lens mount. One other option is to go "superzoom" as I have with my K200D. The Pentax 18-250mm zoom has an incredible range. It is on the heavy side and not the fastest, yet it covers the range competently. They are getting harder to find. A forum member had one for sale in the Marketplace recently. There is also a Tamron version that retails for a bit more.
11-03-2009, 09:57 AM   #7
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I've look at Amazon and there is a k-x bundle with the 18-55 and the 55-200, also there is one on pre-order with the 18-55 and the 50-300.

I would choose the last one if I were you, the 50-300 is really good!
11-03-2009, 10:05 AM   #8
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Only drawback is the k-x kit lenses arent quick shift... not a big deal to some but optically identical to there DA brothers

11-03-2009, 10:13 AM   #9
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The Nikon 18-105 is rated fairly well by Thom Hogan, but the Sigma 18-125 is no slouch either and a great walkaround range. Both my entries to the PPG were accepted using this lens and some PP. Check out some of the photos in my user gallery for examples.
11-03-2009, 10:16 AM   #10
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If I were in your spot, I'd get the 16-45 and 55-300. Low price, quality combo.
11-03-2009, 10:37 AM   #11
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first off, I'm in a similar boat like you about 2 weeks ago, was deciding if I should go with Canon 500D or K-X. Camera features aside, let's just talk about lenses, from looking at your initial plan, it seems that you are just trying to cover as much of a zoom range as possible (18 - 300mm). This might be a fallacy, to get high quality photo (fast lens, beautiful bohkee), u want a lens with sharp contrast and large aperture (f/2.8 and below), that's what really matters. If this is really the first DSLR you are purchasing, I think you should at least do a little more research on what are impotant qualities in a lens and what zoom ranges you actually need. Nikon/Canon does offer amazing lenses, but it comes with a hefty price tag too, Pentax's almost always cheaper and the quality is at least comparable.
11-03-2009, 01:04 PM   #12
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QuoteOriginally posted by LeDave Quote
If I were in your spot, I'd get the 16-45 and 55-300. Low price, quality combo.
This indeed sounds like the best bang for you buck.
The 16-45 has a very very good reputation, and the 55-300, although a slow telephoto, is capable of bringing detail and colour that its peers just cannot, but the Tamron 70-300 does come pretty close...
11-03-2009, 01:36 PM   #13
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QuoteOriginally posted by blu3ness Quote
from looking at your initial plan, it seems that you are just trying to cover as much of a zoom range as possible (18 - 300mm). This might be a fallacy, to get high quality photo (fast lens, beautiful bohkee), u want a lens with sharp contrast and large aperture (f/2.8 and below), that's what really matters.
This is definitely the right way to be thinking. Don't get fooled into evaluating lenses solely by focal length range. In fact, quality is usually *inversely* proportional to the zoom ratio - the greater the zoom ratio, the worse the quality, at least for any given price. My simple formula for roughly gauging the approximate quality of a lens: price divided by zoom ratio.

So while it's true that Pentax doesn't offer any 6X zoom lenses like the 18-105, that doesn't mean their lenses are worse - quite the contrary, actually. But if do decide you just want to maximize zoom range, or get the highest zoom range you can for a given amount of money, I'd be buying the body alone and pairing it with an 18-250, which although recently discontinued by both Pentax and Tamron, should still be pretty readily available. This would a better solution for most people than an 18-105 + 70-300 combination would. Or, if you don't mind paying a bit more for higher quality, the 16-45 or 17-70 (or even 18-55) plus 55-300 combination.
11-04-2009, 04:41 AM   #14
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Thanks for all the replies.

I'm sorry that I didn't reply sooner, but yesterday was a busy day...

Let me try to answer all your comments...

I'm moving from a 5 year old Panasonic FZ30 that has a 12x F2.8 - F3.7 lens. I really like this lens because its very versatile with the 12x zoom and because is also a fast lens, even at 420mm.

I'm aware that "In fact, quality is usually *inversely* proportional to the zoom ratio", but I wouldn't like to lose focal range for now because I'm very used (and my wife to) of having this big focal range.

Because this will by my first reflex, I was thinking of buying one or two all arround lenses that covers the all focal range and
Then, in the future, I can buy some more "specific" and much better lens.

My problem with the 18-55 or 16-50 is that the 50/55 tele zoom is not enough and I don't think I will be switching lens all the time (at least for now).
I mentioned the 18-105 lens because I've used one for two day and I really like it, and I was pleased by it's focal range.

One of the option is the the Pentax 18-250...I didn't know that it was discontinued...does anybody knows if there will be a new version?
The problem with this lens is that the it's very slow even at moderate focal length.

Botton of the line, although the 55-300 is a relative good tele zoom, the 18-55 or 16-50 doesn't give me the versatility I was looking for. I was really looking for at least 100mm in the tele zoom.

Unfortunately, I know there isn't a perfect 18-300 f2.8 lens...
11-04-2009, 04:50 AM   #15
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No, certainly not.
But you may consider Tamron's 18-250: PentaxForums.com Third-Party Pentax Lens Review Database - AF 18-250mm F/3.5-6.3 Di II LD

Don't know where you could get one, but it should be easier to find than Pentax's 18-250.
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