Pentax D FA 150-450 focal length not accurate.

JML69 · 04-18-2017, 01:04 PM

When zoomed out to 450 mm the information reads 310 mm in the camera, this is on a k-3ii or k-5ii. I can back it off less than 1/16 of an inch to where the white line on the ring is now at the 0 of 450 instead of the 5 of 450 and it shows 450 mm as it should.

I have cleaned all contacts and other than being a little aggravating it does not affect quality, any ideas what could be causing this? Thought I was drinking more than normal when I noticed it last night.

pschlute · 04-18-2017, 04:28 PM

Originally posted by JML69

other than being a little aggravating it does not affect quality,

It will however be giving you an incorrect shake reduction correction and may also be an issue if you use any lens correction settings in camera.

JML69 · 04-19-2017, 04:40 AM

Thank you for the replies dcshooter and pschlute, may need to send it in for service.

04-18-2017, 01:04 PM	#1
JML69 Senior Member Join Date: Jun 2015 Location: FL Posts: 172	Pentax D FA 150-450 focal length not accurate. When zoomed out to 450 mm the information reads 310 mm in the camera, this is on a k-3ii or k-5ii. I can back it off less than 1/16 of an inch to where the white line on the ring is now at the 0 of 450 instead of the 5 of 450 and it shows 450 mm as it should. I have cleaned all contacts and other than being a little aggravating it does not affect quality, any ideas what could be causing this? Thought I was drinking more than normal when I noticed it last night.

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04-18-2017, 04:28 PM	#2
pschlute Moderator Loyal Site Supporter Join Date: Mar 2007 Location: Surrey, UK Photos: Gallery Posts: 8,222	Originally posted by JML69 other than being a little aggravating it does not affect quality, It will however be giving you an incorrect shake reduction correction and may also be an issue if you use any lens correction settings in camera.

04-19-2017, 04:40 AM	#3
JML69 Senior Member Join Date: Jun 2015 Location: FL Posts: 172 Original Poster	Thank you for the replies dcshooter and pschlute, may need to send it in for service.