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06-02-2012, 07:31 AM   #1
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New Guy K-r Question

There is a Sigma 70-300mm f4-5.6 APO DG Macro for sale online and the seller told me that all he knoiws is that it is for Sigma DSLR cameras.
Does anyone know if it will fit my K-r?

Thanks

06-02-2012, 07:37 AM   #2
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No, it will need to have a Pentax mount. Sigma cameras use a different mount.
06-02-2012, 07:38 AM   #3
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Unless the lens' documentation specifically states that the lens has a Pentax K-mount, I wouldn't bother. Sigma sells its lenses in a variety of mount types, including the Sigma SA mount for its own SLR cameras.
06-02-2012, 07:42 AM   #4
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QuoteOriginally posted by crewl1 Quote
No, it will need to have a Pentax mount. Sigma cameras use a different mount.



Thanks I'll keep shopping

06-02-2012, 07:43 AM   #5
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QuoteOriginally posted by JimJohnson Quote
Unless the lens' documentation specifically states that the lens has a Pentax K-mount, I wouldn't bother. Sigma sells its lenses in a variety of mount types, including the Sigma SA mount for its own SLR cameras.

Thanks
I think I may go with the Pentax 55-300mm.
06-02-2012, 07:56 AM   #6
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Sigma 70-300mm f/4-5.6 DG OS Telephoto Zoom for Pentax AF 572109

FYI. The Sigma in K-mount is on sale right now.
06-02-2012, 07:56 AM   #7
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QuoteOriginally posted by TheBear Quote
Thanks
I think I may go with the Pentax 55-300mm.
I've been relatively happy with my 55-300. The 50-200 is just fine for general photography too, is smaller than the 55-300 and uses the same filter size as the 18-55.
06-02-2012, 09:21 AM   #8
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Here is a comparison between the two lenses.
Comparing numbers is one aspect, the other aspects that I can think of are...
  • How their respective images compare - Opinions of others in terms of the imagery produced. The 55-300 is no prime 300, but it is a very good lens. I have one and I like it. Its a zoom so it does cover a wider set of focal lengths than a prime. Obviously the prime would be sharper.
  • The one item that does stand out to me is the OS designation on the Sigma lens. Its optical stabilized. This gives you an option of either using the in body stabilization or the lens stabilization. Never use both - why, you might ask? Both the body and the lens will sense the movement, the lens will adapt to the movement stabilizing the light that is sent to the body. As the now stabilized light enters the body and hits the now moving sensor, the stabilization provided by the lens will be undone by the body stabilization of the sensor, essentially adding the movement back in, there by blurring the image. Now, I have not heard of any outright OS failures of the Sigma lenses, like Pentax's SDM lenses, but its another source of failure. I know that OS and SDM are apples and oranges in terms of functionality. however, I have a tendency to shy away from any and all additional capabilities that can break.
  • Price, the Sigma goes for $350, and now on sale for $300, while the Pentax is going for $380. That is a 25% savings in favor of the Sigma. That may be worthwhile

I was looking at the lens comparison website and saw that Sigma makes the same lens with out the OS and it is cheaper by $100 at $200 and change. That may also be an alternative to the Pentax.


.


Last edited by interested_observer; 06-02-2012 at 09:29 AM.
06-02-2012, 09:33 AM   #9
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grabbed on the fly with my K-r using the Pentax DA L 55-300
https://www.pentaxforums.com/gallery/images/45748/1_Deer_at_Farm_Apr7-2012.jpg
06-02-2012, 12:36 PM   #10
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QuoteOriginally posted by lammie200 Quote
Sigma 70-300mm f/4-5.6 DG OS Telephoto Zoom for Pentax AF 572109

FYI. The Sigma in K-mount is on sale right now.


Thanks
I'll check it out
06-02-2012, 12:37 PM   #11
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QuoteOriginally posted by JimJohnson Quote
I've been relatively happy with my 55-300. The 50-200 is just fine for general photography too, is smaller than the 55-300 and uses the same filter size as the 18-55.





I am leaning towards the Pentax
06-02-2012, 12:39 PM   #12
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QuoteOriginally posted by JimJohnson Quote
grabbed on the fly with my K-r using the Pentax DA L 55-300
https://www.pentaxforums.com/gallery/images/45748/1_Deer_at_Farm_Apr7-2012.jpg

Wow
That is beautiful.
I've been checking out te pictures on the forum.
I'm amazed at how beautiful they are.

It's gonna' take awhile before I take pictutres like I've seen here.
06-02-2012, 12:40 PM   #13
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QuoteOriginally posted by interested_observer Quote
Here is a comparison between the two lenses.
Comparing numbers is one aspect, the other aspects that I can think of are...
  • How their respective images compare - Opinions of others in terms of the imagery produced. The 55-300 is no prime 300, but it is a very good lens. I have one and I like it. Its a zoom so it does cover a wider set of focal lengths than a prime. Obviously the prime would be sharper.
  • The one item that does stand out to me is the OS designation on the Sigma lens. Its optical stabilized. This gives you an option of either using the in body stabilization or the lens stabilization. Never use both - why, you might ask? Both the body and the lens will sense the movement, the lens will adapt to the movement stabilizing the light that is sent to the body. As the now stabilized light enters the body and hits the now moving sensor, the stabilization provided by the lens will be undone by the body stabilization of the sensor, essentially adding the movement back in, there by blurring the image. Now, I have not heard of any outright OS failures of the Sigma lenses, like Pentax's SDM lenses, but its another source of failure. I know that OS and SDM are apples and oranges in terms of functionality. however, I have a tendency to shy away from any and all additional capabilities that can break.
  • Price, the Sigma goes for $350, and now on sale for $300, while the Pentax is going for $380. That is a 25% savings in favor of the Sigma. That may be worthwhile
I was looking at the lens comparison website and saw that Sigma makes the same lens with out the OS and it is cheaper by $100 at $200 and change. That may also be an alternative to the Pentax.

.


Thanks so much for all the info.
I found a Pentax 55-300mm on sale at a very compeitive price to the Sigma, so I grabbed it.

I really do appreciate all the help.
Now I can't wait to get it home.
06-02-2012, 01:11 PM   #14
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You'll find it a superior lens over the Sigma in every way. Check out its lens sample archive here on the forum for more good examples of what it can do.
06-03-2012, 07:35 AM   #15
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QuoteOriginally posted by Ash Quote
You'll find it a superior lens over the Sigma in every way. Check out its lens sample archive here on the forum for more good examples of what it can do.

Couldn't pass it up for the difference.
Been looking but I can't find the archive you mentioned.
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