New Guy K-r Question

TheBear · 06-02-2012, 07:31 AM

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

**crewl1** · 06-02-2012, 07:37 AM

No, it will need to have a Pentax mount. Sigma cameras use a different mount.

**JimJohnson** · 06-02-2012, 07:38 AM

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.

TheBear · 06-02-2012, 07:42 AM

Originally posted by crewl1

No, it will need to have a Pentax mount. Sigma cameras use a different mount.

Thanks I'll keep shopping

TheBear · 06-02-2012, 07:43 AM

Originally posted by JimJohnson

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.

lammie200 · 06-02-2012, 07:56 AM

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.

**JimJohnson** · 06-02-2012, 07:56 AM

Originally posted by TheBear

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.

**interested_observer** · 06-02-2012, 09:21 AM

Here is a comparison between the two lenses.

Sigma 70-300mm f/4-5.6 DG OS Pentax-k vs Pentax DA 55-300mm f/4-5.8 ED

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.

Sigma 70-300mm f/4-5.6 APO DG Macro Pentax-k vs Pentax DA 55-300mm f/4-5.8 ED

.

**JimJohnson** · 06-02-2012, 09:33 AM

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

TheBear · 06-02-2012, 12:36 PM

Originally posted by lammie200

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

TheBear · 06-02-2012, 12:37 PM

Originally posted by JimJohnson

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

TheBear · 06-02-2012, 12:39 PM

Originally posted by JimJohnson

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.

TheBear · 06-02-2012, 12:40 PM

Originally posted by interested_observer

Here is a comparison between the two lenses.

Sigma 70-300mm f/4-5.6 DG OS Pentax-k vs Pentax DA 55-300mm f/4-5.8 ED

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.

Sigma 70-300mm f/4-5.6 APO DG Macro Pentax-k vs Pentax DA 55-300mm f/4-5.8 ED

.

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.

**Ash** · 06-02-2012, 01:11 PM

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.

TheBear · 06-03-2012, 07:35 AM

Originally posted by Ash

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.

06-02-2012, 07:31 AM	#1
TheBear New Member Join Date: May 2012 Posts: 19	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, 09:21 AM	#8
interested_observer Loyal Site Supporter Join Date: Jun 2009 Location: Tumbleweed, Arizona Photos: Gallery \| Albums Posts: 5,707	Here is a comparison between the two lenses. Sigma 70-300mm f/4-5.6 DG OS Pentax-k vs Pentax DA 55-300mm f/4-5.8 ED 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. Sigma 70-300mm f/4-5.6 APO DG Macro Pentax-k vs Pentax DA 55-300mm f/4-5.8 ED . Last edited by interested_observer; 06-02-2012 at 09:29 AM.

06-02-2012, 12:40 PM	#13
TheBear New Member Join Date: May 2012 Posts: 19 Original Poster	Originally posted by interested_observer Here is a comparison between the two lenses. Sigma 70-300mm f/4-5.6 DG OS Pentax-k vs Pentax DA 55-300mm f/4-5.8 ED 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. Sigma 70-300mm f/4-5.6 APO DG Macro Pentax-k vs Pentax DA 55-300mm f/4-5.8 ED . 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.

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06-02-2012, 07:37 AM	#2
crewl1 Site Supporter Join Date: Jul 2010 Location: Los Angeles, CA Photos: Gallery \| Albums Posts: 9,807	No, it will need to have a Pentax mount. Sigma cameras use a different mount.

06-02-2012, 07:38 AM	#3
JimJohnson Loyal Site Supporter Join Date: Jan 2012 Location: Summer:Lake Superior - Michigan Winter:Texas Hill Country Photos: Gallery Posts: 2,772	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
TheBear New Member Join Date: May 2012 Posts: 19 Original Poster	Originally posted by crewl1 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
TheBear New Member Join Date: May 2012 Posts: 19 Original Poster	Originally posted by JimJohnson 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
lammie200 Veteran Member Join Date: Jun 2011 Location: San Francisco Photos: Albums Posts: 1,033	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
JimJohnson Loyal Site Supporter Join Date: Jan 2012 Location: Summer:Lake Superior - Michigan Winter:Texas Hill Country Photos: Gallery Posts: 2,772	Originally posted by TheBear 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, 09:33 AM	#9
JimJohnson Loyal Site Supporter Join Date: Jan 2012 Location: Summer:Lake Superior - Michigan Winter:Texas Hill Country Photos: Gallery Posts: 2,772	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
TheBear New Member Join Date: May 2012 Posts: 19 Original Poster	Originally posted by lammie200 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
TheBear New Member Join Date: May 2012 Posts: 19 Original Poster	Originally posted by JimJohnson 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
TheBear New Member Join Date: May 2012 Posts: 19 Original Poster	Originally posted by JimJohnson 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, 01:11 PM	#14
Ash Loyal Site Supporter Join Date: Mar 2007 Location: Toowoomba, Queensland Photos: Gallery \| Albums Posts: 23,920	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
TheBear New Member Join Date: May 2012 Posts: 19 Original Poster	Originally posted by Ash 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.