Using the D FA HD Pentax 50 mm 1.4 lens with K1... Remember to upgrade firmware

Happy Days · 09-05-2020, 08:22 PM - **5 Likes**

A helpful post inside this forum helped me understand that my K1 needed a firmware upgrade. Prior to reading this forum post, I took this fabulous lens out twice to see what it could do. What I discovered: exposure settings were crazy wild and auto-focus was hit and miss. Well, I upgraded my K1 and my K3 and am looking forward to a different experience tomorrow. Thanks for being the Pentax voice in an Other Brand Universe. Will post soon...

pschlute · 09-06-2020, 06:50 AM

Originally posted by Happy Days

A helpful post inside this forum helped me understand that my K1 needed a firmware upgrade. Prior to reading this forum post, I took this fabulous lens out twice to see what it could do. What I discovered: exposure settings were crazy wild and auto-focus was hit and miss. Well, I upgraded my K1 and my K3 and am looking forward to a different experience tomorrow. Thanks for being the Pentax voice in an Other Brand Universe. Will post soon...

While we are at it we can also advise the same for anyone buying the DFA* 85mm 1.4

**gaweidert** · 09-06-2020, 10:27 AM - **1 Like**

Welcome aboard. We accept all compliments with our usual humility.

Medex · 09-06-2020, 02:31 PM

Originally posted by pschlute

While we are at it we can also advise the same for anyone buying the DFA* 85mm 1.4

I use DFA* 85/1.4 but did not FW upgrade (still v1.51). Any problems with autofocus or exposure. Had no problems with DFA* 50/1.4 as well when I tried it for the first time (FW 1.43 was installed). I think FW upgrade is not critical in these cases, if it is not 1.00-1.10 version. Some problems with KAF4 lenses were solved in v1.20.

pschlute · 09-07-2020, 12:32 PM

Originally posted by Medex

I use DFA* 85/1.4 but did not FW upgrade (still v1.51). Any problems with autofocus or exposure. Had no problems with DFA* 50/1.4 as well when I tried it for the first time (FW 1.43 was installed). I think FW upgrade is not critical in these cases, if it is not 1.00-1.10 version. Some problems with KAF4 lenses were solved in v1.20.

I have absolutely no idea. What I will say is that if Pentax advises to use fw 1.53 when using the DFA 85mm I will do so. I am at a loss to understand why anyone would think otherwise would be a good idea. But it is your choice

09-05-2020, 08:22 PM - 5 Likes	#1
Happy Days New Member Join Date: Sep 2020 Posts: 1	Using the D FA HD Pentax 50 mm 1.4 lens with K1... Remember to upgrade firmware A helpful post inside this forum helped me understand that my K1 needed a firmware upgrade. Prior to reading this forum post, I took this fabulous lens out twice to see what it could do. What I discovered: exposure settings were crazy wild and auto-focus was hit and miss. Well, I upgraded my K1 and my K3 and am looking forward to a different experience tomorrow. Thanks for being the Pentax voice in an Other Brand Universe. Will post soon...

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09-06-2020, 06:50 AM	#2
pschlute Moderator Loyal Site Supporter Join Date: Mar 2007 Location: Surrey, UK Photos: Gallery Posts: 8,216	Originally posted by Happy Days A helpful post inside this forum helped me understand that my K1 needed a firmware upgrade. Prior to reading this forum post, I took this fabulous lens out twice to see what it could do. What I discovered: exposure settings were crazy wild and auto-focus was hit and miss. Well, I upgraded my K1 and my K3 and am looking forward to a different experience tomorrow. Thanks for being the Pentax voice in an Other Brand Universe. Will post soon... While we are at it we can also advise the same for anyone buying the DFA* 85mm 1.4

09-06-2020, 10:27 AM - 1 Like	#3
gaweidert Loyal Site Supporter Join Date: Mar 2012 Location: Rochester, NY Photos: Gallery Posts: 5,327	Welcome aboard. We accept all compliments with our usual humility.

09-06-2020, 02:31 PM	#4
Medex Pentaxian Join Date: May 2013 Location: Vilnius Posts: 1,021	Originally posted by pschlute While we are at it we can also advise the same for anyone buying the DFA* 85mm 1.4 I use DFA* 85/1.4 but did not FW upgrade (still v1.51). Any problems with autofocus or exposure. Had no problems with DFA* 50/1.4 as well when I tried it for the first time (FW 1.43 was installed). I think FW upgrade is not critical in these cases, if it is not 1.00-1.10 version. Some problems with KAF4 lenses were solved in v1.20.

09-07-2020, 12:32 PM	#5
pschlute Moderator Loyal Site Supporter Join Date: Mar 2007 Location: Surrey, UK Photos: Gallery Posts: 8,216	Originally posted by Medex I use DFA* 85/1.4 but did not FW upgrade (still v1.51). Any problems with autofocus or exposure. Had no problems with DFA* 50/1.4 as well when I tried it for the first time (FW 1.43 was installed). I think FW upgrade is not critical in these cases, if it is not 1.00-1.10 version. Some problems with KAF4 lenses were solved in v1.20. I have absolutely no idea. What I will say is that if Pentax advises to use fw 1.53 when using the DFA 85mm I will do so. I am at a loss to understand why anyone would think otherwise would be a good idea. But it is your choice