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netuser · 01-05-2010, 09:43 AM

Originally posted by kunik

I'd be curious to see the results if anyone has tried stacking the 1.7x and 1.4x on the k-7 with ANY F2.8 lens. I'm pretty sure that the K-7 would autofocus that combo but I wonder if the image would look OK?

Let's see if someone can make the test for us

borno · 01-05-2010, 10:07 AM

I stacked a 1.5x kenko and the 1.7x afa on my DA300 f4 with the k20d and it worked, I'll try to find the shot after work. I gotta go back to work.

netuser · 01-05-2010, 10:34 AM

Other alternative, can the sigma 2x converter work properly in the FA 300/2.8 ?

borno · 01-05-2010, 02:10 PM

Here's a couple with the da300mm f4 and stacked 1.5x kenko and 1.7x afa with the k10d. I remember it auto-focusing but had to use 1250 iso. I got a 2x tamron sp teleconverter and tried it with my FA300 f2.8 and it seemed to work ok, but results were inconclusive as the lens was soft even with no tc.

netuser · 01-05-2010, 02:38 PM

Originally posted by borno

..................I remember it auto-focusing but had to use 1250 iso. I got a 2x tamron sp teleconverter and tried it with my FA300 f2.8 and it seemed to work ok, but results were inconclusive as the lens was soft even with no tc.
..................[/IMGWIDE]

This converter ?
PentaxForums.com Third-Party Pentax Lens Review Database - 2X Magnification
you mean autofocus right ?

**Ash** · 01-05-2010, 02:48 PM

Originally posted by borno

Here's a couple with the da300mm f4 and stacked 1.5x kenko and 1.7x afa with the k10d. I remember it auto-focusing but had to use 1250 iso. I got a 2x tamron sp teleconverter and tried it with my FA300 f2.8 and it seemed to work ok, but results were inconclusive as the lens was soft even with no tc.

Wow, Tom.
You got the DA 300 to AF with those two TCs together?
That's over 2.5 stops light reduction! Well done.

borno · 01-05-2010, 03:56 PM

Originally posted by Ash

Wow, Tom.
You got the DA 300 to AF with those two TCs together?
That's over 2.5 stops light reduction! Well done.

Thanks Ash, I was just fooling around to see if it would work when I happened to see the mother Fox and 2 young. I didn't really use the combo much because I thought the 1.7x and cropping if necessary was probably as good.

xjjohnno · 01-10-2010, 12:48 AM

Some Tammy 300 60B pics done wide
[IMGWIDELEFT]http://www.xjgarage.org/photos/january2010/slides/PICT5226.JPG[/IMGWIDELEFT]
[IMGWIDELEFT]http://www.xjgarage.org/photos/january2010/slides/PICT5163.JPG[/IMGWIDELEFT]
[IMGWIDELEFT]http://www.xjgarage.org/photos/january2010/slides/PICT5250.JPG[/IMGWIDELEFT]

Stickl · 08-12-2012, 03:38 PM

If someone has a FA 300/2.8 lens, please put photos here, I want to see how does its AF works and what's the IQ.

And photos must be taken with 2.8 aperture.

**dadipentak** · 08-12-2012, 05:35 PM

Um, I've seen borno's photos and, on that basis, would tend to accept his judgement with regard to that copy of the lens.

**Pål Jensen** · 08-12-2012, 05:48 PM

Originally posted by borno

I had a FA*300 f2.8 (sold my motorcycle to buy it) and it was soft even stopped down. I sent it in twice and pentax wouldn't touch it, they told me it was a film lens and may not work well on digital. I was pretty PO'ed and had to trade it, I can try to find my disc of images later. I had to get a canon 300mm, just got it last week and am very happy with it. I would have been happy to have my pentax lens adjusted, but they weren't willing (or capable) I would say be warned if you need service, you might not get it.

My FA*600/4 was soft with my K10D. No other lens was. I sent it in and got it adjusted but no effect. Strangely, when I upgraded to the K-7 the lens became sharp. I have no idea as to why the FA* lens was incompatibe with my K10D. With any other lens there was no difference between the K10D and the K-7 in terms of lens performance.

**Pål Jensen** · 08-12-2012, 05:50 PM

Originally posted by Stickl

If someone has a FA 300/2.8 lens, please put photos here, I want to see how does its AF works and what's the IQ.

And photos must be taken with 2.8 aperture.

Why? The reason you see very few images at 2.8 is that the DOF is too shallow to be much useful. Most of the time people want all of the subject in focus. Not just the eyes....

borno · 08-12-2012, 06:49 PM

Here's a canon 300mm at f2.8 from the other day

borno · 08-12-2012, 07:02 PM

Originally posted by Pål Jensen

My FA*600/4 was soft with my K10D. No other lens was. I sent it in and got it adjusted but no effect. Strangely, when I upgraded to the K-7 the lens became sharp. I have no idea as to why the FA* lens was incompatibe with my K10D. With any other lens there was no difference between the K10D and the K-7 in terms of lens performance.

My FA*300mm f2.8 needed +10 ma on the k20d, but still wasn't sharp, even manually focused. Funny thing was, it looked just as good with the 1.7x afa wide open as it did without it. I'm sure it was just a bad copy and they just blew me off, so I had to go elsewhere or I would still be shooting pentax. A little good service makes a big difference to me.

SteveM · 08-12-2012, 09:28 PM

These are all wide open at f2.8. A*300. The extra weight of a lens capable of 2.8 is a downside.....you might as well use it to it's advantage.

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01-05-2010, 09:43 AM	#31
netuser Veteran Member Join Date: Oct 2008 Location: Azores Islands, Portugal Photos: Gallery Posts: 2,236 Original Poster	Originally posted by kunik I'd be curious to see the results if anyone has tried stacking the 1.7x and 1.4x on the k-7 with ANY F2.8 lens. I'm pretty sure that the K-7 would autofocus that combo but I wonder if the image would look OK? Let's see if someone can make the test for us

01-05-2010, 10:07 AM	#32
borno Veteran Member Join Date: Nov 2006 Location: md-usa Photos: Gallery \| Albums Posts: 2,580	I stacked a 1.5x kenko and the 1.7x afa on my DA300 f4 with the k20d and it worked, I'll try to find the shot after work. I gotta go back to work.

01-05-2010, 10:34 AM	#33
netuser Veteran Member Join Date: Oct 2008 Location: Azores Islands, Portugal Photos: Gallery Posts: 2,236 Original Poster	Other alternative, can the sigma 2x converter work properly in the FA 300/2.8 ?

01-05-2010, 02:10 PM	#34
borno Veteran Member Join Date: Nov 2006 Location: md-usa Photos: Gallery \| Albums Posts: 2,580	Here's a couple with the da300mm f4 and stacked 1.5x kenko and 1.7x afa with the k10d. I remember it auto-focusing but had to use 1250 iso. I got a 2x tamron sp teleconverter and tried it with my FA300 f2.8 and it seemed to work ok, but results were inconclusive as the lens was soft even with no tc.

01-05-2010, 02:38 PM	#35
netuser Veteran Member Join Date: Oct 2008 Location: Azores Islands, Portugal Photos: Gallery Posts: 2,236 Original Poster	Originally posted by borno ..................I remember it auto-focusing but had to use 1250 iso. I got a 2x tamron sp teleconverter and tried it with my FA300 f2.8 and it seemed to work ok, but results were inconclusive as the lens was soft even with no tc. ..................[/IMGWIDE] This converter ? PentaxForums.com Third-Party Pentax Lens Review Database - 2X Magnification you mean autofocus right ?

01-05-2010, 02:48 PM	#36
Ash Loyal Site Supporter Join Date: Mar 2007 Location: Toowoomba, Queensland Photos: Gallery \| Albums Posts: 23,920	Originally posted by borno Here's a couple with the da300mm f4 and stacked 1.5x kenko and 1.7x afa with the k10d. I remember it auto-focusing but had to use 1250 iso. I got a 2x tamron sp teleconverter and tried it with my FA300 f2.8 and it seemed to work ok, but results were inconclusive as the lens was soft even with no tc. Wow, Tom. You got the DA 300 to AF with those two TCs together? That's over 2.5 stops light reduction! Well done.

01-05-2010, 03:56 PM	#37
borno Veteran Member Join Date: Nov 2006 Location: md-usa Photos: Gallery \| Albums Posts: 2,580	Originally posted by Ash Wow, Tom. You got the DA 300 to AF with those two TCs together? That's over 2.5 stops light reduction! Well done. Thanks Ash, I was just fooling around to see if it would work when I happened to see the mother Fox and 2 young. I didn't really use the combo much because I thought the 1.7x and cropping if necessary was probably as good.

01-10-2010, 12:48 AM	#38
xjjohnno Veteran Member Join Date: Jan 2009 Location: Melbourne Australia Photos: Gallery Posts: 2,115	Some Tammy 300 60B pics done wide [IMGWIDELEFT]http://www.xjgarage.org/photos/january2010/slides/PICT5226.JPG[/IMGWIDELEFT] [IMGWIDELEFT]http://www.xjgarage.org/photos/january2010/slides/PICT5163.JPG[/IMGWIDELEFT] [IMGWIDELEFT]http://www.xjgarage.org/photos/january2010/slides/PICT5250.JPG[/IMGWIDELEFT]

08-12-2012, 03:38 PM	#39
Stickl Senior Member Join Date: Mar 2012 Location: Oulu Posts: 271	If someone has a FA 300/2.8 lens, please put photos here, I want to see how does its AF works and what's the IQ. And photos must be taken with 2.8 aperture.

08-12-2012, 05:35 PM	#40
dadipentak Site Supporter Join Date: Jul 2008 Location: Baltimore, Maryland Photos: Gallery Posts: 11,590	Um, I've seen borno's photos and, on that basis, would tend to accept his judgement with regard to that copy of the lens.

08-12-2012, 05:48 PM	#41
Pål Jensen Site Supporter Join Date: Dec 2007 Location: Norway Photos: Albums Posts: 4,371	Originally posted by borno I had a FA300 f2.8 (sold my motorcycle to buy it) and it was soft even stopped down. I sent it in twice and pentax wouldn't touch it, they told me it was a film lens and may not work well on digital. I was pretty PO'ed and had to trade it, I can try to find my disc of images later. I had to get a canon 300mm, just got it last week and am very happy with it. I would have been happy to have my pentax lens adjusted, but they weren't willing (or capable) I would say be warned if you need service, you might not get it. My FA600/4 was soft with my K10D. No other lens was. I sent it in and got it adjusted but no effect. Strangely, when I upgraded to the K-7 the lens became sharp. I have no idea as to why the FA* lens was incompatibe with my K10D. With any other lens there was no difference between the K10D and the K-7 in terms of lens performance.

08-12-2012, 05:50 PM	#42
Pål Jensen Site Supporter Join Date: Dec 2007 Location: Norway Photos: Albums Posts: 4,371	Originally posted by Stickl If someone has a FA 300/2.8 lens, please put photos here, I want to see how does its AF works and what's the IQ. And photos must be taken with 2.8 aperture. Why? The reason you see very few images at 2.8 is that the DOF is too shallow to be much useful. Most of the time people want all of the subject in focus. Not just the eyes....

08-12-2012, 06:49 PM	#43
borno Veteran Member Join Date: Nov 2006 Location: md-usa Photos: Gallery \| Albums Posts: 2,580	Here's a canon 300mm at f2.8 from the other day

08-12-2012, 07:02 PM	#44
borno Veteran Member Join Date: Nov 2006 Location: md-usa Photos: Gallery \| Albums Posts: 2,580	Originally posted by Pål Jensen My FA600/4 was soft with my K10D. No other lens was. I sent it in and got it adjusted but no effect. Strangely, when I upgraded to the K-7 the lens became sharp. I have no idea as to why the FA lens was incompatibe with my K10D. With any other lens there was no difference between the K10D and the K-7 in terms of lens performance. My FA*300mm f2.8 needed +10 ma on the k20d, but still wasn't sharp, even manually focused. Funny thing was, it looked just as good with the 1.7x afa wide open as it did without it. I'm sure it was just a bad copy and they just blew me off, so I had to go elsewhere or I would still be shooting pentax. A little good service makes a big difference to me.

08-12-2012, 09:28 PM	#45
SteveM Veteran Member Join Date: Jan 2009 Location: Vancouver Island, BC, Canada Photos: Gallery Posts: 3,294	These are all wide open at f2.8. A*300. The extra weight of a lens capable of 2.8 is a downside.....you might as well use it to it's advantage.

300mm/2.8 images, only at 2.8

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