Pentax 150-450mm F4.5-5.6 with 1.4x converter


Darrel

Link Posted 22/06/2019 - 11:20
I've been using the Pentax DA* 300mm f4 with the Pentax-DA AF Rear Converter 1.4x converter on my K3II for wildlife shots and I've been pleased with the results. Recently though I've been thinking of investing in the Pentax 150-450mm F4.5-5.6 lens to bring more possibilities into view and was wondering how the lens performs with the converter. Any thoughts?

bforbes

Link Posted 22/06/2019 - 12:06
Just remember the 1.4x is not suitable for FF.
Barrie
Too Old To Die Young
.
Pentax K1 K5-IIS K-01 K20D A50/2 A50/1.7 DA10-17 DA18-250 DA18-135 DA18-55 DA300 DA40 DA50-135 DA50-200 DA55-300 DA70 F35-70 DFA150-450 FA20-35 FA100 FA135 FA35 FA28 FA43 FA50 FA77 K55/1.8 M135/3.5 M200/4 M28/3.5 M28/2.8 M40/2.8 Q 01 02 MX-1 I-10 Sigma 15 24 105 180 8-16 10-20 17-35 17-50/2.8 24-70 400/5.6MF Tamron 70-200/2.8 17/3.5MF 24/2.5MF 28/2.5MF 90/2.5MF


http://www.pentaxphotogallery.com/artists/barrieforbes

1stEverPentax

Link Posted 22/06/2019 - 12:53
Not sure if i'm imagining it, but i think I read somewhere that Pentax are bringing out a FF convertor later this year...there might have been mention of two new convertors.

Darrel

Link Posted 24/06/2019 - 12:43
I'm not planning a switch to FF, just wanted to know how well suited the x1.4 converter is to the 150-450 zoom lens.

Daronl

Link Posted 25/06/2019 - 00:01
Fine on an on you k3 II but remember the perspective at 450 is equivalent to a very long telephoto when you combine the cropping factor for the APS x1.4 from the converter.

The field of view will be comparable to that of a lens of 945mm focal length ( if my old codger brain is still OK - if not please feel free to correct me)

But I have used the 1.4 x on the 150-450 with my K3II and if your camera and lens are well supported itís optically ok for sure, but not ideal; bit like using an RPGL or carrying a extension ladder o your shoulder
Daronl
Last Edited by Daronl on 25/06/2019 - 00:12

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McBrian

Link Posted 25/06/2019 - 12:23
I didn't have the K3 + 1.4x + DFA 150-450 for long but I was very happy with the results, here's a couple of example, both hand held IIRC:





LR lens profile pp only
Cheers
Brian.
LBA is good for you, a Lens a day helps you work, rest and play.

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AlB

Link Posted 26/06/2019 - 13:00
bforbes wrote:
Just remember the 1.4x is not suitable for FF.

Depends what you mean by "not suitable". I regularly use the 1.4x convertor with the 150-450, Tamron 70-200 f2.8 and the Tamron 90 f2.8 on my K1. It works well with all these lens with only a small amount of vignette in the four corners. This I usually deal with by a minimal amount of cropping.




This was taken on the cliffs at Flamborough Head with K1, 150-450 plus 1.4x convertor. Very little vignette
Last Edited by AlB on 26/06/2019 - 13:12

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bforbes

Link Posted 26/06/2019 - 22:57
AlB wrote:
bforbes wrote:
Just remember the 1.4x is not suitable for FF.

Depends what you mean by "not suitable". I regularly use the 1.4x convertor with the 150-450, Tamron 70-200 f2.8 and the Tamron 90 f2.8 on my K1. It works well with all these lens with only a small amount of vignette in the four corners. This I usually deal with by a minimal amount of cropping.




This was taken on the cliffs at Flamborough Head with K1, 150-450 plus 1.4x convertor. Very little vignette

The 1.4x was designed for crop sensor, so to me that amount of vignette means "not suitable".
Barrie
Too Old To Die Young
.
Pentax K1 K5-IIS K-01 K20D A50/2 A50/1.7 DA10-17 DA18-250 DA18-135 DA18-55 DA300 DA40 DA50-135 DA50-200 DA55-300 DA70 F35-70 DFA150-450 FA20-35 FA100 FA135 FA35 FA28 FA43 FA50 FA77 K55/1.8 M135/3.5 M200/4 M28/3.5 M28/2.8 M40/2.8 Q 01 02 MX-1 I-10 Sigma 15 24 105 180 8-16 10-20 17-35 17-50/2.8 24-70 400/5.6MF Tamron 70-200/2.8 17/3.5MF 24/2.5MF 28/2.5MF 90/2.5MF


http://www.pentaxphotogallery.com/artists/barrieforbes

Toni60

Link Posted 30/06/2019 - 20:18
Wonderful shots, I would like to buy 1.4 x converter and use it with my K5IIs and DA 100mm macro 2.8 WR and 60-250. I found in Italy one used but similar to new.
Please have you a samples with these lens?
When this converter is used the main lens is recognized by ACR for distortion correction?
Thanks for your help and have a nice week.
Toni
Toni
Last Edited by Toni60 on 30/06/2019 - 20:31

Darrel

Link Posted 01/07/2019 - 10:10
I use the x1.4 converter with my K3II and PENTAX-D FA 100mm F2.8 MACRO all the time - it's a great combination giving additional stand-off distance that's very useful for butterflies.
I don't know if the camera recognises the converter for distortion correction (I usually shoot RAW) but the results are first class. See my Flickr pages at https://www.flickr.com/gp/darrelphoto/05N75s
Best
Darrel
Last Edited by Darrel on 01/07/2019 - 10:12

Lubbyman

Link Posted 01/07/2019 - 14:27
And I use the x1.4 converter with a K3 and Sigma 105mm macro to good effect. Can't see why it shouldn't be as good with a DA 100mm macro and K5IIs. But like Darrel, I don't know whether the lens and/or converter is recognised for distortion correction (I never use it).

Steve

Toni60

Link Posted 03/07/2019 - 07:37
Thanks for reply, I am sure that the converter works fine with K5IIs and DA 100 mm macro.
Darrel I shoot in raw (dng) only in raw, I've seen your photos, my congrats for macro and train photos that is one of my favorite subject.
I'm considering the purchase.
I wish you the best.
Toni

Darrel

Link Posted 03/07/2019 - 15:45
Thanks Toni - good luck!
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