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11-24-2018, 01:04 PM   #1
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Pentax 150-450mm + Pentax Convertor 1.4

Going to a wildlife photo tour.
I am thinking of this setup: K-1 II with a Pentax 150-450mm + Pentax 1.4 convertor
Is anyone has experience with this setup?
I know the convertor will create black corners.
Is there in the Market any modern convertor for full frame with AF and contacts?
Thanks
Gérard

11-24-2018, 02:18 PM - 1 Like   #2
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Gerard - I will test a Sigma EX 1.4x TC on that lens camera for you. This TC is full frame.
11-24-2018, 02:22 PM   #3
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It seems at least one genuine Pentax full frame teleconvertor is under development, expected in the centenary year 2019.
11-24-2018, 02:52 PM   #4
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QuoteOriginally posted by gerardbaron Quote
Going to a wildlife photo tour.
I am thinking of this setup: K-1 II with a Pentax 150-450mm + Pentax 1.4 convertor
Is anyone has experience with this setup?
I know the convertor will create black corners.
Is there in the Market any modern convertor for full frame with AF and contacts?
Thanks
Gérard
I use the DFA 150-450 + Pentax 1.4x TC on a K-1 quite a bit, and am happy with the combination.
There is a bit of vignetting but in my opinion it's minor and causes me no concern.
A big advantage of the 1.4x TC is that it corrects the focal length, and stores the lens combination in the exif.

Cheers,
Terry

11-24-2018, 04:59 PM - 3 Likes   #5
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I ran resolution chart experiments with the 1.4X + 150~450mm and posted them on PF years back. I found little difference in resolution between the lens @ 450mm without and with the 1.4X. In other words, if you crop an image taken @ 450mm without the TC & compare to one taken with the 1.4X, there is essentially no difference. So, if you like the idea of shooting @ about 600mm and don't mind losing an f-stop, the 1.4X will work fine. However, you can get essentially indistinguishable results by using the lens without TC, then cropping a bit more.
11-24-2018, 07:22 PM   #6
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Converter

Thank you all for your help
Gérard
11-24-2018, 08:48 PM   #7
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The Sigma EX 1.4x DOES NOT WORK. So do not try it. It lacks the two gold contacts needed for AFing.

I will try the Tamron F 1.4x instead and report back soon
11-24-2018, 09:21 PM   #8
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Thank you

11-24-2018, 09:31 PM   #9
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QuoteOriginally posted by gerardbaron Quote
Going to a wildlife photo tour.
I am thinking of this setup: K-1 II with a Pentax 150-450mm + Pentax 1.4 convertor
Is anyone has experience with this setup?
I know the convertor will create black corners.
Is there in the Market any modern convertor for full frame with AF and contacts?
Thanks
Gérard
We actually did a direct review of this combo. Guess it's about time to publish it:


Testing the HD Pentax-DA 1.4x AW AF with the D FA 150-450mm Review - Introduction | PentaxForums.com Reviews

Adam
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11-25-2018, 02:31 AM   #10
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Thanks Adam - interesting results with the TC. I will have a look at what the Tamron TC can do as a full frame alternative. Incidentally, very basic comparison of the Sigma TC showed similar results (i.e. no loss in image quality) but I was manual focusing to get this outcome.
11-25-2018, 05:26 AM   #11
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QuoteOriginally posted by Paul the Sunman Quote
It seems at least one genuine Pentax full frame teleconvertor is under development, expected in the centenary year 2019.
I would welcome that, and I would pre-order it now if I could!

But while I've heard rumours and wishes, I haven't seen solid evidence that it is imminent, and it isn't on the lens roadmap.

What do you know about this that I don't know?
11-25-2018, 06:35 AM   #12
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QuoteOriginally posted by Barry Pearson Quote
I would welcome that, and I would pre-order it now if I could!

But while I've heard rumours and wishes, I haven't seen solid evidence that it is imminent, and it isn't on the lens roadmap.

What do you know about this that I don't know?
I think Asahiman reported this.
11-25-2018, 07:41 AM   #13
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QuoteOriginally posted by Adam Quote
We actually did a direct review of this combo. Guess it's about time to publish it:


Testing the HD Pentax-DA 1.4x AW AF with the D FA 150-450mm Review - Introduction | PentaxForums.com Reviews
Especially good timing since it's at the lowest price I can find going back through the history in the price finder tool - black Friday deal at B&H that goes through Monday for $396.95. Haven't decided if it makes sense for my shooting though. Would like to know how a modified baffle 60-250 works with the DA 1.4x on full frame. If we really have a 2x for full frame coming out this upcoming year, then waiting would seem best.
11-25-2018, 09:25 AM   #14
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Great timing on the review of this combination. Thanks.
11-25-2018, 02:51 PM   #15
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QuoteOriginally posted by Barry Pearson Quote
I would welcome that, and I would pre-order it now if I could!

But while I've heard rumours and wishes, I haven't seen solid evidence that it is imminent, and it isn't on the lens roadmap.

What do you know about this that I don't know?
Asahi Man's post:

FF TC - full frame teleconverter - Page 8 - PentaxForums.com

He's generally pretty close to the source.
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