Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
01-05-2010, 09:43 AM   #31
Veteran Member
netuser's Avatar

Join Date: Oct 2008
Location: Azores Islands, Portugal
Photos: Gallery
Posts: 2,241
Original Poster
QuoteOriginally posted by kunik Quote
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
Veteran Member
borno's Avatar

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
Veteran Member
netuser's Avatar

Join Date: Oct 2008
Location: Azores Islands, Portugal
Photos: Gallery
Posts: 2,241
Original Poster
Other alternative, can the sigma 2x converter work properly in the FA 300/2.8 ?
01-05-2010, 02:10 PM   #34
Veteran Member
borno's Avatar

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
Veteran Member
netuser's Avatar

Join Date: Oct 2008
Location: Azores Islands, Portugal
Photos: Gallery
Posts: 2,241
Original Poster
QuoteOriginally posted by borno Quote
..................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
Community Manager
Loyal Site Supporter
Ash's Avatar

Join Date: Mar 2007
Location: Toowoomba, Queensland
Photos: Gallery | Albums
Posts: 22,678
QuoteOriginally posted by borno Quote
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
Veteran Member
borno's Avatar

Join Date: Nov 2006
Location: md-usa
Photos: Gallery | Albums
Posts: 2,580
QuoteOriginally posted by Ash Quote
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
Veteran Member
xjjohnno's Avatar

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
Senior Member
Stickl's Avatar

Join Date: Mar 2012
Location: Oulu
Posts: 262
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
Loyal Site Supporter
dadipentak's Avatar

Join Date: Jul 2008
Location: Baltimore, Maryland
Photos: Gallery
Posts: 10,073
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
Pentaxian
Pål Jensen's Avatar

Join Date: Dec 2007
Location: Norway
Photos: Albums
Posts: 3,064
QuoteOriginally posted by borno Quote
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.
08-12-2012, 05:50 PM   #42
Pentaxian
Pål Jensen's Avatar

Join Date: Dec 2007
Location: Norway
Photos: Albums
Posts: 3,064
QuoteOriginally posted by Stickl Quote
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
Veteran Member
borno's Avatar

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
Veteran Member
borno's Avatar

Join Date: Nov 2006
Location: md-usa
Photos: Gallery | Albums
Posts: 2,580
QuoteOriginally posted by Pål Jensen Quote
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.
08-12-2012, 09:28 PM   #45
Loyal Site Supporter
SteveM's Avatar

Join Date: Jan 2009
Location: Vancouver Island, BC, Canada
Photos: Gallery
Posts: 3,295
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.






Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
images, k-mount, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Sigma 28-300mm DG: My Humble Experiences (Numerous Images) Nowhere Matt Pentax SLR Lens Discussion 4 08-13-2010 06:22 AM
Sample Images from Sigma 80-200mm 2.8 vs. Tamron 70-300mm 4-5.6 ajtour Pentax SLR Lens Discussion 1 06-08-2010 09:17 AM
A variety of images with FA* 200/4 Macro (no bugs) - VLF competition images Marc Langille Post Your Photos! 28 08-22-2008 07:28 PM
Post your DA* 300mm f/4 images Tbear Pentax SLR Lens Discussion 4 04-23-2008 08:56 AM
New images with DA* 300mm f4 mille19 Pentax SLR Lens Discussion 20 04-07-2008 04:45 PM



All times are GMT -7. The time now is 01:51 AM. | See also: NikonForums.com, part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top