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03-24-2014, 03:28 PM   #16
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OK. Here are a couple more taken out the car window of a squirrel at the feeder. Lots of fine hairs to judge sharpness. With the light conditions, ISO400 was the best I could achieve, even dropping the shutter to 1/500 (I used the window as a prop for the lens). I always shoot at least one stop down from wide open so without the TC it was 1/500, f5.6, ISO400 and with the TC it was 1/500, f8, ISO400 using TAv. I will not post full 22mb jpegs to my Flickr site so you will need to be happy with these 2560x1702 versions. I used the same amount of exposure lift, local contrast and USM sharpening on both frames. No NR done. I have zero fine focus adjustment for the straight 300mm and +3 for the 300+TC. Still fine tuning the adjustment. I should add that I have a "Birds_no_hold" USER mode set up using the back AF button and AFC with no hold setting. That way I get instantaneoous response to any subject movement.

First without the TC:




And one with the TC:




Jack

03-24-2014, 04:12 PM   #17
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The squirrel with the TC indeed looks way better at a similar magnification. There's a very faint halo blurring with the TC but that is nicer than the digital artifacts the similar crop without the TC shows when you zoom in.
03-25-2014, 06:26 AM   #18
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QuoteOriginally posted by jbinpg Quote
OK. Here are a couple more taken out the car window of a squirrel at the feeder. Lots of fine hairs to judge sharpness. With the light conditions, ISO400 was the best I could achieve, even dropping the shutter to 1/500 (I used the window as a prop for the lens). I always shoot at least one stop down from wide open so without the TC it was 1/500, f5.6, ISO400 and with the TC it was 1/500, f8, ISO400 using TAv. I will not post full 22mb jpegs to my Flickr site so you will need to be happy with these 2560x1702 versions. I used the same amount of exposure lift, local contrast and USM sharpening on both frames. No NR done. I have zero fine focus adjustment for the straight 300mm and +3 for the 300+TC. Still fine tuning the adjustment. I should add that I have a "Birds_no_hold" USER mode set up using the back AF button and AFC with no hold setting. That way I get instantaneoous response to any subject movement.
Jack
I am impressed to say the least.
This could well make me place the order for that TC.

I have had little luck in terms of IQ with the DA*300/4 and the Pentax-F 1.7X AF adapter nor with the Tamron-F 1.4X PZ-AF MCF, althought the Pentax adapter seems to be a bit more "accurate".
This is with the K5 camera, so I have no idea what the difference would be when compared to the same setup with the K3.

So, I refrained from using those TC's because of the loss of details so this new TC could well tilt the balance in favour of it.

Thanks for sharing.

JP
04-02-2014, 02:19 AM   #19
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I got a replacement TC from Pentax and I feel it performs much better than the first one.

These pics are with DA*300 + Pentax TC and the second I have added my Kenko as well. Shot at a close distance. (10-15 feet)





04-02-2014, 02:01 PM   #20
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I've seen really good results on initial tests of the 1.4x with the 60-250 at the long end on K-3. More detail revealed when cropped to the same FOV compared to using my AFA 1.7x, and wins on contrast and CA too. Accuracy of PD and contrast AF is excellent with this combo here, so much better than ever achieved with the 1.7x. The 1.4x also played nice with a brief try on the D-FA 100 Macro (this was around MFD), so is a keeper for me.

By the way, stacking the AFA 1.7 and 1.4 did not reveal more detail, just made it harder to focus and restricted the aperture. So for the 1.7x, it's looking like retirement beckons.

Last edited by johnc; 04-02-2014 at 11:01 PM.
04-03-2014, 08:33 AM   #21
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So now I am satisfied with my testing of the TC and will now go out and take some pictures and not thinking about the ifs and buts of the technical side of the K-3, the DA*300 and the new TC. Did a last test of the TC at about 17 meters shooting at different f-stops with tripod and MUP via 2s selftimer. I took the f5.6 300 shot and upsampled it 140% to compare it to the 420 @ f8 shot. I find that there is more detail in the TC shot than in the upsampled version. See for your selves.

One note to make is that some of the shots got a litte to slow shutter speed and the wind gave a litte camera shake that I saw when I got to the computer and even though I took two frames at each setting it was not enough...

/Thomas

Upsampled from 300 f5.6 to 420 f8

420 f8

420 f6.3

420 f5.6

300 f5.6

300 f4.5

300 f4.0



EDIT: To get the fullsize versions goto flickr and download them.
04-03-2014, 09:40 AM   #22
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Great to have some HD DA 1.4 TC and DA*300 ƒ4 examples, there have been a lot of questions.

QuoteOriginally posted by johnc Quote
I've seen really good results on initial tests of the 1.4x with the 60-250 at the long end on K-3. More detail revealed when cropped to the same FOV compared to using my AFA 1.7x, and wins on contrast and CA too. Accuracy of PD and contrast AF is excellent with this combo here, so much better than ever achieved with the 1.7x. The 1.4x also played nice with a brief try on the D-FA 100 Macro (this was around MFD), so is a keeper for me.

By the way, stacking the AFA 1.7 and 1.4 did not reveal more detail, just made it harder to focus and restricted the aperture. So for the 1.7x, it's looking like retirement beckons.
I find the 1.7 adds a lot more reach and works well with the 60-250. Plus, it adds AF to my A-400. If I ever get an A-300 2.8 it will become an partial AF 510 4.5. To me, that would probably beat the stuffing off the 560 ƒ5.6, and would be $5k cheaper. Especially since the 560 can't be a manual focus 300 ƒ2.8. I'm keeping mine.

Last edited by normhead; 04-03-2014 at 09:47 AM.
04-04-2014, 10:58 AM   #23
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QuoteOriginally posted by normhead Quote
Great to have some HD DA 1.4 TC and DA*300 ƒ4 examples, there have been a lot of questions.



I find the 1.7 adds a lot more reach and works well with the 60-250. Plus, it adds AF to my A-400. If I ever get an A-300 2.8 it will become an partial AF 510 4.5. To me, that would probably beat the stuffing off the 560 ƒ5.6, and would be $5k cheaper. Especially since the 560 can't be a manual focus 300 ƒ2.8. I'm keeping mine.
Yep, the Af 1.7 is really perfect for adding AF to the MF lenses........ And who knows what will happen if we ever get to FF land? You're also right the 1.7x and 300-2.8 would make for an intriguing combo!

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