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11-12-2010, 04:53 AM   #1
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Which Lens to Purchase With K-r Kit

I am just about ready to purchase the K-r at b&h and I am looking for advice on which tele-lens to get with it. Either the 55-300 or the 50-200. I will be shooting alot of kids hockey and soccer events along with landscapes and family photos.
I currently have the Pentax-F 100-300 4.5-5.6 lens from my old film camera.
When the saletech put this lens on the k-x (they didnt have the K-r in stock), he showed me that this lens will actually be longer than 300 on the dslr's than on the slr's. Does this sound accurate?

Can I rely on this older lens and pick up the new 200 tele for size and speed or should i update to the new 300? If so, will i be sacrificing anything?

Any advice would be very-much appreciated.

Mark

11-12-2010, 06:47 AM   #2
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QuoteOriginally posted by markt Quote
I am just about ready to purchase the K-r at b&h and I am looking for advice on which tele-lens to get with it. Either the 55-300 or the 50-200. I will be shooting alot of kids hockey and soccer events along with landscapes and family photos.
I currently have the Pentax-F 100-300 4.5-5.6 lens from my old film camera.
When the saletech put this lens on the k-x (they didnt have the K-r in stock), he showed me that this lens will actually be longer than 300 on the dslr's than on the slr's. Does this sound accurate?

Can I rely on this older lens and pick up the new 200 tele for size and speed or should i update to the new 300? If so, will i be sacrificing anything?

Any advice would be very-much appreciated.

Mark
1) By most standards, the 55-300 is far superior to the 50-200.

2) Your old lens is full-frame. So, a 300mm full-frame lens that gave you a 300mm "view" on a film camera that you were so used to now gives you a 450mm view on your DLSR. You take the focal length and multiply it by 1 1/2. Like, the 50mm view that my 50 gave me on my SLR gives me the equivalent of 75mm on an APS-C sensor (compared to film), since it's only using the center portion, not the entire view, the entire glass mechanics of that lens. (It gets cropped.) And old full frame lenses are cherished because all lenses are sharpest at their center, and a full frame on a DSLR uses more of the center.

In other words:

If I put a modern new 75mm lens on my digital camera, and a 50mm on my film camera, they would give me the same view. So in the future, if Pentax comes out with a full-frame DSLR, the 75mm lens can't be used, and the 50 will behave as it does on film.

Think of it as what image/light hits a frame of film, compared to what hits an APS-C sensor, which is smaller than a frame of film. With an old full frame lens, a lot of the image is cropped off all of the sides on APS-C, never hitting the sensor. (Some people refer to this as the "crop factor" of APS-C sensors, but other people yell at those people because there are debates on the proper anal-retentive way to describe/explain it.)

3) You're also getting the 18-55 kit lens, right? You didn't mention that, and you need to cover wider for the landscapes you mentioned.

Last edited by Ira; 11-12-2010 at 06:57 AM.
11-12-2010, 07:36 AM   #3
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Another thing to keep in mind is the 50-200 is f/5.6 at 200mm. The 55-300 retains f/4 "almost" to 200mm, so would be nearly a full stop faster, thus allowing you to shoot at a lower ISO. You may get less noisy photos. Also, the 200mm gets soft all over at it's longest length - at least mine did. The 55-300 stays sharp throughout its range and only gets corner soft at 300. The 50-200 is nice and compact, though. The 50-200 isn't a bad lens, the 55-300 is just that much better.
11-12-2010, 08:35 AM   #4
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I'd choose the 55-300 if I was making that decision.

Jason

11-12-2010, 09:00 AM   #5
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QuoteOriginally posted by markt Quote

Can I rely on this older lens and pick up the new 200 tele for size and speed or should i update to the new 300? If so, will i be sacrificing anything?
I just realized this part of your thread:

Your old lens isn't autofocus, right? If not and you can live with that, maybe you want to hold off on the 55-300. But that being said, the 55-300 price is a bargain when purchased with the kit.
11-12-2010, 09:27 AM   #6
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The 100-300 that i currently have is an auto focus. I seem to remember from back in the SLR days that the greater the tele lens focal length span, the slower the lens and it would be better to have more incremental lenses than just one tele that covers a broad range? (Going from memory here. and mine is like a bear trap, rusty and illegal in 48 states).
I seems that with the DSLR's, more compensation is available with the broad ISO ranges available now.

Yes , I am getting the 18-55 lens kit too.

Thanks for all the advice.

Mark

Last edited by markt; 11-12-2010 at 09:34 AM.
11-12-2010, 11:14 AM   #7
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QuoteOriginally posted by Ira Quote
In other words:

If I put a modern new 75mm lens on my digital camera, and a 50mm on my film camera, they would give me the same view. So in the future, if Pentax comes out with a full-frame DSLR, the 75mm lens can't be used, and the 50 will behave as it does on film.
Wrong

Put a 50mm on the dSLR and a 75mm on the SLR and you have the facts straight ( or the view the same).

And the rest of the text quoted above is also a question mark A 75mm from the digital era might work properly or might not work properly due to vignetting. Stop smoking that grass, it changes your "view"
11-12-2010, 11:19 AM   #8
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QuoteOriginally posted by markt Quote
When the saletech put this lens on the k-x (they didnt have the K-r in stock), he showed me that this lens will actually be longer than 300 on the dslr's than on the slr's. Does this sound accurate?
I posted this a while ago in a thread to explain what one is talking about.

Might be of help

11-12-2010, 01:09 PM   #9
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QuoteOriginally posted by sterretje Quote
Wrong

Put a 50mm on the dSLR and a 75mm on the SLR and you have the facts straight ( or the view the same).

And the rest of the text quoted above is also a question mark A 75mm from the digital era might work properly or might not work properly due to vignetting. Stop smoking that grass, it changes your "view"
I flopped two figures, but still think I did a good job of explaining it.

And pot's illegal. I don't care about the cops--it's my wife.
11-12-2010, 02:12 PM   #10
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There will be no difference between the film 300 and new the 300, they will both zoom the same amount.

Save your money now, and then buy a new lens when you really feel the burn. The lens you have should be great for hockey!
11-12-2010, 05:41 PM   #11
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I agree -- the 100-300 might not be the 'best' lens, but it should cover the range just fine while you figure out what ranges are most important to you, and worth investing in. You can also figure out whether you need a wider aperture the most, or faster autofocus, or whether you decide that smaller, lighter lenses are what you want next.

And on that last point, if you have money burning a hole in your pocket after your body + lens purchase, you could pick up a prime lens (AF or not) to try a different style of shooting . . .
11-12-2010, 06:51 PM   #12
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Since the 55-300 doesn't come in Colors (if that's important to you), hold off on the longer zoom and roll with your 100-300 for now. That is, if money is any kind of an issue. I wouldn't buy the 50-200 in either case. 200mm, even in the cropped field of view sense, is never Enough zoom.

11-12-2010, 09:21 PM   #13
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If you buy the kit 55-300 (superior to the 50-200) do not forget to buy a lens hood as you won't get one with it.
11-13-2010, 06:21 AM   #14
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QuoteOriginally posted by SpecialK Quote
If you buy the kit 55-300 (superior to the 50-200) do not forget to buy a lens hood as you won't get one with it.
All the better reason to wait IMO. The hood, if you get the Pentax one, costs $45 last time I looked. If you're going to do that, you may as well get the DA version rather than the DA-L version. That way you get the metal mount and quick shift as well and the hood comes with the lens. Check the used market, these turn up all the time.

NEW, In stock at B&H, the DA lens is $350, free shipping (USA). Used, the DA-L goes for roughly $270. I'll let anyone who cares, do the math.

11-13-2010, 07:24 AM   #15
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I have the 50-200 and it is really a fine lens for what it's worth but I don't think it would be any better than your 100-300 except from the fact that it is considerably smaller, and you would like that extra reach from the 100-300

can't comment on the 55-300 since I never used it
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