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08-18-2008, 05:31 PM   #1
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Any reason to keep both of these?

I've been toying with the idea of picking up a DA* 50-135mm, having read so many good things about it and I was wondering whether or not a DA 70 LTD would be worth keeping. Any advice?

08-18-2008, 05:34 PM   #2
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You may have noticed that one lens is a little smaller than the other. If that matters to you, then you might want to keep both and have options.
08-18-2008, 05:42 PM   #3
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if you're still into that focal length and want to minimize overlap, sell the DA70 and get an FA77. that will be a different experience.
08-18-2008, 05:59 PM   #4
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I don't follow. How is that minimizing overlap?

08-18-2008, 06:05 PM   #5
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QuoteOriginally posted by Aegon Quote
You may have noticed that one lens is a little smaller than the other. If that matters to you, then you might want to keep both and have options.
My thoughts exactly. I'm currently in the process of selling my 50-135 and picking up a DA70 on the basis of size. Whilst I love the 50-135 in all it's glory I wouldn't dare travel with it...
08-18-2008, 06:07 PM   #6
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It reduces overlap because the 77 is faster than the 70, giving you a fast zoom and a prime that is more than a full stop faster than your zoom for a bit more flexibility.
08-18-2008, 06:07 PM   #7
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QuoteOriginally posted by G_Money Quote
I don't follow. How is that minimizing overlap?
the DA70 at f2.4 isn't much faster but the FA77 at 1.8 is and offers some more interesting opportunities. it is actually very similar in size the the DA70 w/ hood although weighs quite a bit more.
08-18-2008, 07:01 PM   #8
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The DA70 is actually closer to 68mm and f2.8...so the FA77 is a fair bit faster.

c[_]

08-18-2008, 07:15 PM   #9
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So the consensus seems to be that a 77mm would be worth having as an addition to the 50-135, but not necessarily the 70mm. Interesting. If speed is an issue I have an FA 50mm f1.4, a 1/2 stop faster than the 77mm albeit with less reach. Good points, thanks everyone. Selling the 70 would make funding the 50-135 much easier, but a 77mm would be stretching the budget too much. I love the 70mm, but the stuff I see shot with the 50-135 just sizzles.
08-18-2008, 07:34 PM   #10
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QuoteOriginally posted by ll_coffee_lP Quote
The DA70 is actually closer to 68mm and f2.8...so the FA77 is a fair bit faster.

c[_]
I absolutely HATE it when people (usually people who have NEVER owned the DA70) make that comment about focal length and aperture on the DA70 as a justification for why you should buy the FA77 over the DA70.

I've owned BOTH the FA77 and the DA70, and while the FA77 is nice and bright and has wonderful build quality, there are four reasons I sold the FA77 and kept the DA70:

1) The FA77 lacks quick-shift manual focus for adjusting focus without flipping the switch on the camera body.

2) The FA77 is softer between f/1.8 and f/2.8 (particularly at the edges of the frame) than the DA70 is wide open at f/2.4

3) The FA77 is more prone to purple fringe than the DA70.

4) The FA77 is heavier/larger than the DA70.

As for the b*llsh*t about the focal length and aperture of the DA70 being a big lie, here are sample images taken with the DA70 wide open at f/2.4 and the same photo taken from the same camera position with the Sigma 24-70 f/2.8 DG zoom (a GREAT zoom lens, by the way) at 70mm wide open at f/2.8:

With the DA70, the K10D calculated the correct exposure at 1/30 and f/2.4

With the Sigma 24-70 the K10D calculated correct exposure at 1/25 and f/2.8

The difference between 1/30 and 1/25 is the difference between f/2.4 and f/2.8

You'll also notice that the DA70 image is not only sharper ... but that the box in the DA70 image looks BIGGER (as in the focal length is longer) meaning the DA70 is either closer to 70mm than the 24-70mm lens or it is longer than 70mm.

Last edited by JJJPhoto; 09-01-2008 at 04:58 AM.
08-18-2008, 07:51 PM   #11
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perhaps your sigma 24-70 is also short of 70 too? some lenses only reach their longest focal length at infinity focus
edit: your test is bogus. you have a Sigma 24-60 not a 24-70 ... that or you set your 24-70 to 60mm :S

this is the source of all your frustration :P , tests have been referred to and comments have been made of the focal length
Should I get 77mm or 70mm? - Photo.net Pentax Forum
08-18-2008, 08:02 PM   #12
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QuoteOriginally posted by k100d Quote
perhaps your sigma 24-70 is also short of 70 too? some lenses only reach their longest focal length at infinity focus
edit: your test is bogus. you have a Sigma 24-60 not a 24-70 ... that or you set your 24-70 to 60mm :S

this is the source of all your frustration :P , tests have been referred to and comments have been made of the focal length
Should I get 77mm or 70mm? - Photo.net Pentax Forum
Sorry about that. The focal length error was not intentional. My Sigma 24-70 has a loose zoom ring and I nudged it during the test. Here is a revised test (confirmed both are at 70mm this time) and while the difference isn't as night-and-day the DA70 does appear to be slightly longer.

Again, the K10D produced a shutter speed of 1/30 at f/2.4 and 1/25 at f/2.8
Attached Images
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PENTAX K10D  Photo 
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PENTAX K10D  Photo 
08-18-2008, 08:16 PM   #13
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don't mean this to be a witch hunt or anything, i'm just really interested in why the DA70 is shorter. thanks for taking some photos to test.

according to the popphoto test of the Sigma 24-70mm, it tests out to be 68.26mm
Lens Test: Sigma 24-70mm f/2.8 EX DG AF - - PopPhotoMarch 2002

popphoto says they tested it to be 67.5mm
Lens Test: Pentax 70mm f/2.4 Limited - - PopPhotoMay 2007
08-18-2008, 08:30 PM   #14
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I owned both DA70 and FA77 and the 50-135.

because the OP was interested in info about the having both DA70 and DA*50-135, I'll address the similarities and differences between the DA70 and DA*50-135 and not a Sigma lens.

These are just my observations from having these various lenses...

The colors and contrast and detail was the same on both the DA70 as the 50-135, even pixel-peeping. That's why I sold the DA70, it just wasn't needed with the 50-135, the images looked the same, other than the compact size of the DA70 it offered nothing unique or advantageous over the 50-135. If I had not bought the DA*50-135, I'd kept the DA70 as I like the color and rendering, but the 50-135 gives me that and at various focal lengths.

Interesting also was the exposure. Virtually identical on the 50-135 at 2.8 as the DA70 was at 2.4. My DA35 also exposes a bit darker at 2.8 than the 50-135 does at 2.8, so maybe it's a DA ltd thing.

Now, if you still want a prime to use in conjunction with the DA*50-135 or in place of at times, I'd say the FA77 goes well with the DA*50-135 (as K100D has pointed out):

The FA77, on the other hand is sharper than the 50-135 at the same range, and it is faster as well. Unlike the DA70, the color and contrast is different between the FA77 and DA*50-135. I'm not knocking the DA70, I'm saying how wonderful the DA*50-135 has been. The DA*Zooms are about as good as the DA Limiteds, and they are just as fast, so there are some redundancies there. The FA primes offer a little different look, so some different options when choosing a lens to use and the FA primes are a little faster, so again a different reason and usage there.
08-19-2008, 12:18 AM   #15
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Thanks Augustmoon

great post
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