Pentax 1.4x converter on K1


Link Posted 05/07/2018 - 15:32
Like to extend the range on my DFA 150-450. Can I use the Pentax DA 1.4x converter on DFA lens mounted on K1?


Link Posted 05/07/2018 - 15:47
Yes, see below pinched from SRS's web site, but you may get some vignetting in FF thou

" When coupled with an AF lens, the autofocus operation can be performed by the main lens. This rear converter works perfectly with both the camera-driven AF system and the lens-driven AF system (such as the SDM- and DC- series lenses). The camera’s firmware must be updated to the latest version before using the autofocus function. Compatible camera bodies are: K-S1, K-3, K-50, K-500, K-30, K-5 II, K-5 II s, K-5, K-01, K-7, and K-r. Autofocus is possible with a Pentax lens having maximum aperture of f/4 or brighter "

" A Hangover is something that occupies the Head you neglected to use the night before".

K1 - Sigma 85mm F1.4, Pentax 150 -450 F4.5 / 5.6, Pentax FA 24 - 70 F2.8

Sigma 100-300 F4, Samyang 14mm F2.8, Sigma 70-200 F2.8,

K5iis - Sigma 17 - 70 F2.8, Sigma 70 - 300 F3.5/F5.6, Sigma 18 - 200 F3.6 / F4.5.
Last Edited by Chrism8 on 05/07/2018 - 15:55


Link Posted 05/07/2018 - 15:57
Because the DA1.4x is designed for a Crop sensor you will get some vignette on images from the K-1 if used in full frame mode. You will of course have the opportunity to crop in post process or Use the K-1 in crop mode.
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


Link Posted 05/07/2018 - 16:20
I've removed the duplicated thread and moved this one to Lenses.
Best regards, John


Link Posted 05/07/2018 - 17:01
About to list mine in the classifieds
Welsh Photographer

My outfit: K1 gripped - Pentax DFA 28-105mm - Sigma 70-200mm HSM Macro - Sigma 105mm - Pentax FA 35mm f2 - Tokina 20-35mm, Sigma 50-500mm - Pentax AF 540 FGZ Ii

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