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02-11-2014, 09:25 PM   #1
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Vivitar 1.4x TC Adapter for Pentax AF

Has anyone used this adapter? Any opinion? Does it work with the FA lenses? Is it better than the Pentax AFA 1.7x TC (which is too much really!).





1.4X-P :: 1.4x Auto Focus Tele Converter for Pentax :: Vivitar

02-11-2014, 09:35 PM   #2
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QuoteOriginally posted by Pepe Guitarra Quote
Has anyone used this adapter? Any opinion? Does it work with the FA lenses? Is it better than the Pentax AFA 1.7x TC (which is too much really!).





1.4X-P :: 1.4x Auto Focus Tele Converter for Pentax :: Vivitar
It adds a noticeable amount of fringing, but yes it does AF with FA lenses. The effective aperture and focal length are not transmitted to the camera, but auto metering still works.

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02-11-2014, 09:39 PM   #3
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QuoteOriginally posted by Adam Quote
It adds a noticeable amount of fringing, but yes it does AF with FA lenses. The effective aperture and focal length are not transmitted to the camera, but auto metering still works.
Adam, what would the best 1.4X TC AF be to use with the Pentax F* 300mm f4.5 ED?
02-11-2014, 09:41 PM   #4
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QuoteOriginally posted by Pepe Guitarra Quote
Adam, what would the best 1.4X TC AF be to use with the Pentax F* 300mm f4.5 ED?
Probably the new one that's just coming out. But time will tell!


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02-11-2014, 09:45 PM   #5
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QuoteOriginally posted by Adam Quote
Probably the new one that's just coming out. But time will tell!
I thought the new one will only work with aperture up to f/4.0?
02-11-2014, 09:51 PM   #6
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QuoteOriginally posted by dansamy Quote
I thought the new one will only work with aperture up to f/4.0?
It's not going to be any better with any other TC at far as AF goes though. Pentax is just using F4 as a rule of thumb. You might run into trouble with the DA 55-300mm F4-5.8 at 300mm, but a F4.5 on the F* lens should still be fine.

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02-12-2014, 04:50 AM   #7
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QuoteOriginally posted by dansamy Quote
I thought the new one will only work with aperture up to f/4.0?
It is not so much that the TC will only work to F4 but that AF in general does not work with native apertures smaller than F6.? I put a question mark there because no AF lens is slower than F6.3 but from experience it is clear that AF can be reliably achiveed at about a limit of F6.9
QuoteOriginally posted by Adam Quote
It's not going to be any better with any other TC at far as AF goes though. Pentax is just using F4 as a rule of thumb. You might run into trouble with the DA 55-300mm F4-5.8 at 300mm, but a F4.5 on the F* lens should still be fine.
Agreed. The AF1.7x converter works very reliably on F4 lenses, so a 1.4x should work on F4.5 lenses. Note when sold, the AF1.7x was marketed to work on F2.8 and faster. At the time I contacted pentax service and (since they were local at the time) got to test the AF converter on my other lenses. It worked fine on my Series 1 70-210/3.5(version 1) and on my M100/4 macro, but not on my 400/5.6.

I bought it because except for the 400 it worked for every other lens I owned at the time

For me the real question is will it (pentaxes new 1.4x) work with the latest sigma 500/4.5?
02-12-2014, 05:56 AM   #8
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I use the Vivitar with the DA L 55-300. Autofocus is noticeably slower at 300mm but still useable. Fringing in high contrast situations can be increased, but the 55-300 tends towards green rather than purple. And since it costs 1/6th of what the new one does I wouldn't worry too much about trying it out.






















02-12-2014, 06:22 AM   #9
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Nice shots. I saw some purple fringing in the first shot.
02-12-2014, 07:13 AM   #10
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Does any one know how well the Series 1 2x 7 element TC or the Series 1 4 element 2x TC work? i would be using it on a DA 55-300mm WR primarily.
02-12-2014, 07:51 AM   #11
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QuoteOriginally posted by Pepe Guitarra Quote
Nice shots. I saw some purple fringing in the first shot.
I included that one to show fringing. Very difficult conditions to shoot in. The sun was low in the sky (just after sunrise) and directly behind the trees. The 55-300 handled it much better than my Promaster 100-400...

---------- Post added 02-12-14 at 09:53 AM ----------

QuoteOriginally posted by Oldbayrunner Quote
Does any one know how well the Series 1 2x 7 element TC or the Series 1 4 element 2x TC work? i would be using it on a DA 55-300mm WR primarily.
The 55-300 will only AF out to about 135mm on a 2x converter.
02-12-2014, 11:02 AM   #12
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QuoteOriginally posted by Lowell Goudge Quote
It is not so much that the TC will only work to F4 but that AF in general does not work with native apertures smaller than F6.? I put a question mark there because no AF lens is slower than F6.3 but from experience it is clear that AF can be reliably achiveed at about a limit of F6.9


Agreed. The AF1.7x converter works very reliably on F4 lenses, so a 1.4x should work on F4.5 lenses. Note when sold, the AF1.7x was marketed to work on F2.8 and faster. At the time I contacted pentax service and (since they were local at the time) got to test the AF converter on my other lenses. It worked fine on my Series 1 70-210/3.5(version 1) and on my M100/4 macro, but not on my 400/5.6.

I bought it because except for the 400 it worked for every other lens I owned at the time

For me the real question is will it (pentaxes new 1.4x) work with the latest sigma 500/4.5?
Modern AF systems by other manufacturers work up to F8. I'm sure Pentax's latest ones do too!

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02-12-2014, 05:59 PM   #13
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QuoteOriginally posted by boriscleto Quote
The 55-300 will only AF out to about 135mm on a 2x converter.
Thanks... I just got my WR 55-300mm today so was wondering what TC would work.
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