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08-19-2011, 06:02 AM   #46
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QuoteOriginally posted by Nick Siebers Quote
Not if you are pairing it with a Fa 20-35, or similar. But then, who (else) is doing that?
I know that 20-35 is an amazing lens, but is the 35-70 really that good as to warrant using a dual lens setup with this lens?I'd say 50-300 or DA 70 would be a abetter combo with FA 20-35, but that's just me

08-19-2011, 09:13 AM   #47
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QuoteOriginally posted by Andi Lo Quote
I know that 20-35 is an amazing lens, but is the 35-70 really that good as to warrant using a dual lens setup with this lens?I'd say 50-300 or DA 70 would be a abetter combo with FA 20-35, but that's just me
As I've mentioned, 35-70mm on a 135/FF camera is a pretty ideal general-purpose range. On APS-C it's a good people range, but not general-purpose -- 18-55mm or 17-70mm would be better. But for what it is, the F35-70 is damn good.
08-19-2011, 09:21 AM   #48
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QuoteOriginally posted by MegaPower Quote
I found the macro function on the F35-70 is not that useful.
It produce about 1:3 at 35cm.
The kit lens 18-55 can produce about 1:3 at 25cm too.
They could have put a macro function on the kit lens by using the standard of the F35-70..
If you MF, you can get to 23cm with the 35-70.
08-19-2011, 09:55 AM   #49
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QuoteOriginally posted by RioRico Quote
As I've mentioned, 35-70mm on a 135/FF camera is a pretty ideal general-purpose range. On APS-C it's a good people range, but not general-purpose -- 18-55mm or 17-70mm would be better. But for what it is, the F35-70 is damn good.
Yeah, I thought abbout mentioning the 17-70, but OP seems to think that lens is not good, sigma or pentax.

For my reply I was just commenting on the dual lens combo between 20-35 and 35-70. I feel that 35 70s role is much much better suited to DA 70 or DA 50-300. I'd personally find that combo more versatile, and not much heavier (much more expensive though)

08-19-2011, 10:23 AM   #50
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QuoteOriginally posted by Andi Lo Quote
Yeah, I thought abbout mentioning the 17-70, but OP seems to think that lens is not good, sigma or pentax.
Actually I mentioned earlier that the Sigma looks good on paper, and user reports seem to back that up . . . it was only the Pentax that I didn't trust after my experience with it (which could have been a bad copy, except that it wasn't just me on the Pentax . . . I've seen others here criticize it for softness).
08-20-2011, 01:01 PM   #51
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Just for fun, I dug out an old Raynox DCR-720, 0.72x Wide-Angle Conversion Lens for Camcorders & Digital Still Cameras with a 52mm Filter Thread. (< Still available new for only $35 on Amazon. There's a newer version DCR-731 that costs $100 or so.) Used a 49-52 step up ring and put it on the front of the F 35-70. I really cannot see any meaningful degradation in quality of the pics, and it basically makes the 35-70 into a 25mm wide lens. There is a bit of distortion, but it is not bad and is correctable. The conversion lens is a bit big (adds ~35mm to the length and has ~78mm diameter at front), but it's easy to screw on/off and you don't have to remove the lens from the body. Yet another way that this F 35-70 can be handy and deliver the goods!

Last edited by mgvh; 08-20-2011 at 01:12 PM.
08-20-2011, 01:02 PM   #52
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QuoteOriginally posted by mgvh Quote
Just for fun, I dug out an old Raynox DCR-720, 0.72x Wide-Angle Conversion Lens for Camcorders & Digital Still Cameras with a 52mm Filter Thread (< still available new for only $35 on Amazon). Used a 49-52 step up ring and put it on the front of the F 35-70. I really cannot see any meaningful degradation in quality of the pics, and it basically makes the 35-70 into a 25mm wide lens. The conversion lens is fairly big, but it's easy to screw on/off and you don't have to remove the lens from the body. Yet another way that this F 35-70 can be handy and deliver the goods!
That's very interesting. Would you mind posting a pic?
08-20-2011, 02:10 PM   #53
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Pentax F 35-70 with Raynox DCR 720

First, a pic showing how wide it goes at 35mm with (top) and without the Raynox DCR720. I tried to include some vertical edges so you can see the distortion.


Next, I took a pic w/ the DCR720 at about 50mm (top) to get about the same perspective as one without at 35mm. These are 100% center crops. The birdhouse is about 100' away.


Conclusions:
  • There isn't much distortion with F35-70 at 35mm, and adding the DCR 720 doesn't add too much more. Still, if you don't want to mess with correcting distortion, it might be easier to take 2 pics w/out the DCR and stitch them together.
  • The DCR 720 really does a pretty good job of preserving detail. You are going to lose a little detail with it just because it is capturing a larger view. When the focal length is adjusted for direct comparison (the second set of pics), you can see how well it does.



Last edited by mgvh; 08-23-2011 at 04:48 PM.
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