help 43mm ltd front focus

andy271 · 03-13-2021, 03:51 PM

Hi all Ive been using the Pentax k-1 on a tripod with pixel shift mainly manual focusing .
Recently I have beenusing the k-1 with the 43mm Ltd lens auto focus and noticed most images were front focusing so I used the lens cal chart and did some tests around 4 feet away im still having problems
My settings are
Phase detection afs
af active area spot
afs setting shuttercan not be released until subject is in focus
Contrast detectionaf 5th one down from the bottom small square
Contrast af optionsshutter can not be released until subjects is in focus
af assist light on
ae metering multisegment
Shake reduction on

any help appreciated

will post images on fliker

---------- Post added 03-13-21 at 04:01 PM ----------

_IMG1615-SharpenAI | andy a | Flickr

first image is tripod pixel shift f3.2 separation of subject at f3.2 is superb 3d pop
so tripod live view isnt a problem with the lens next images will be hand held with shake reduction

they may look sharp but if you donwn load them they are pretty poor sharpenss

one thing with the 43mm ltd i do love is the colour and pop but ther lens is really annoying me

Last edited by andy271; 03-13-2021 at 04:25 PM.

pschlute · 03-13-2021, 06:34 PM

The AF/FA menu only works for PDAF, it is not needed for CDAF.

Try with the camera on a tripod and make adjustments until you achieve proper alignment. Do 10 tests at each AF/FA setting change and go with the majority vote. Dont expect 10/10, PDAF is rarely that accurate.

andy271 · 03-13-2021, 06:43 PM

hi peter do i need to chenge any of my settings

pschlute · 03-13-2021, 06:59 PM

Originally posted by andy271

hi peter do i need to chenge any of my settings

Camera on a tripod. about 6 foot from the test chart you can download and print from here http://www.kscameraclub.org/docs/pdfs/focus_test_chart_edited.pdf. Chart at 45 degree angle. Centre Af point only. Try and use natural light. Use 2 sec timer to avoid camera/tripod shake.

Take 10 shots making the lens work from min/max focus distance each time. Review results and make AF/FA adjustment using the APPLY ONE menu.

Repeat the 10 test shots ..........etc etc.

AF-S is correct

Single centre AF point only

Shake reduction OFF

Last edited by pschlute; 03-13-2021 at 07:04 PM.

andy271 · 03-13-2021, 07:12 PM

thanks peter when i did fine ajustments with the lenscal chart i have i cant rember if i turnes shake reduction off ,ill try again so is 6 foot the correct distance i think last time i did 4 foot

pschlute · 03-13-2021, 07:23 PM

Originally posted by andy271

thanks peter when i did fine ajustments with the lenscal chart i have i cant rember if i turnes shake reduction off ,ill try again so is 6 foot the correct distance i think last time i did 4 foot

On a tripod you want SR off.

The distance you choose is always a compromise. 6 foot for a 43mm lens is about right.

Oh and leave the aperture at 1.9

andy271 · 03-13-2021, 07:27 PM

another thing peter if i put it on a tripod at 6 feet how do i get a 45 degree angle

**K(s)evin** · 03-14-2021, 02:15 AM

The target (chart) needs to be at a 45 degree angle. Laid back, like on a podium or book stand, with the camera sensor at a 90 degree angle (straight up & down) in relation to the chart.

**aslyfox** · 03-14-2021, 04:32 AM - **1 Like**

reviewing this article might be of some help:

Quote:

Fixing Front and Back Focus
Introduction

Fixing Front and Back Focus - Introduction - In-Depth Articles

pschlute · 03-14-2021, 05:24 AM

Originally posted by aslyfox

reviewing this article might be of some help:

Thanks for posting that link. I was trying to find it myself, but sadly failed

andy271 · 03-14-2021, 05:32 AM

yes i already did this but it was with Datacolor SpyderLENSCAL
ill try it again just incase i had steady shot on

allso i was around 4 foot away i wander if 6 foot would be better

as i said with tripod and pixel shift i love the lens ,my zeiss lenses are sharper i can clearley see that but i do love and hate the 43mmltd

**BarryE** · 03-14-2021, 06:16 AM

Andy, may not be an issue, but the 43mm and k-1 combination has been a problem for me with shutter shock, especially between 1/80 and 1/160 sec. Could this be clouding your tests ...?

andy271 · 03-14-2021, 07:09 AM

hi barry very good point i will double check when the weather is a bit better ill go to the same forest and make sure ive got a high shutter speed

andy271 · 03-20-2021, 09:59 AM

Hi guys just thought I would post how I got on with the 43m Ltd afterfine tune adjustment .
This is a funny taleas I went out yesterday and took lots of photos got in and resiled Ihadn't inserted a memory card I was fuming LOL
A whole day wasted
Today went out againand I have to say with doing the fine adjustment I am very veryhappy
The 3d pop out of mylens at f3.2 is remarkable I found ISO 400 to be giving me around1/320th second and had no shutter shock .
When I did the fineadjustment I made sure the tripod was level with the chart in my caselens cal
I turned off shakereduction and had aperture at 1.9 wide open around 6 feet away
im actually shockedat how good this lens is once you have learned how to use it properlyit will give you colour and rendition which is lacking in today'slenses
I cant believe howgood it is
Setting I used

Phase detection af AFS active area spot
Af Assist Light On
Ae Metering MultiSegment
Shake Reduction On
Link Exposure AndFocus Points On
AE-L With Af LockedOn
Viewfinder Light On
Change AF ButtonType 2
Af Fine Tune For MyLens Was -9

---------- Post added 03-20-21 at 10:21 AM ----------

Having Looked Though All The Pics 1/160th Are Not As Sharp As 1/320th Its A Big Difference ,This Was An Overcast Day So iso400 Was Giving Me What I Needed

**BarryE** · 03-20-2021, 10:29 AM

Originally posted by andy271

[/COLOR]Having Looked Though All The Pics 1/160th Are Not As Sharp As 1/320th Its A Big Difference ,This Was An Overcast Day So iso400 Was Giving Me What I Needed

Some folk have not seen shutter shock with this lens. Sounds like you have. There can be a significant difference in IQ between shutter speeds in/out of the troublesome range.

03-13-2021, 03:51 PM	#1
andy271 Senior Member Join Date: Mar 2018 Posts: 192	help 43mm ltd front focus Hi all Ive been using the Pentax k-1 on a tripod with pixel shift mainly manual focusing . Recently I have beenusing the k-1 with the 43mm Ltd lens auto focus and noticed most images were front focusing so I used the lens cal chart and did some tests around 4 feet away im still having problems My settings are Phase detection afs af active area spot afs setting shuttercan not be released until subject is in focus Contrast detectionaf 5th one down from the bottom small square Contrast af optionsshutter can not be released until subjects is in focus af assist light on ae metering multisegment Shake reduction on any help appreciated will post images on fliker ---------- Post added 03-13-21 at 04:01 PM ---------- _IMG1615-SharpenAI \| andy a \| Flickr first image is tripod pixel shift f3.2 separation of subject at f3.2 is superb 3d pop so tripod live view isnt a problem with the lens next images will be hand held with shake reduction they may look sharp but if you donwn load them they are pretty poor sharpenss one thing with the 43mm ltd i do love is the colour and pop but ther lens is really annoying me Last edited by andy271; 03-13-2021 at 04:25 PM.

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03-13-2021, 06:34 PM	#2
pschlute Moderator Loyal Site Supporter Join Date: Mar 2007 Location: Surrey, UK Photos: Gallery Posts: 8,219	The AF/FA menu only works for PDAF, it is not needed for CDAF. Try with the camera on a tripod and make adjustments until you achieve proper alignment. Do 10 tests at each AF/FA setting change and go with the majority vote. Dont expect 10/10, PDAF is rarely that accurate.

03-13-2021, 06:43 PM	#3
andy271 Senior Member Join Date: Mar 2018 Posts: 192 Original Poster	hi peter do i need to chenge any of my settings

03-13-2021, 06:59 PM	#4
pschlute Moderator Loyal Site Supporter Join Date: Mar 2007 Location: Surrey, UK Photos: Gallery Posts: 8,219	Originally posted by andy271 hi peter do i need to chenge any of my settings Camera on a tripod. about 6 foot from the test chart you can download and print from here http://www.kscameraclub.org/docs/pdfs/focus_test_chart_edited.pdf. Chart at 45 degree angle. Centre Af point only. Try and use natural light. Use 2 sec timer to avoid camera/tripod shake. Take 10 shots making the lens work from min/max focus distance each time. Review results and make AF/FA adjustment using the APPLY ONE menu. Repeat the 10 test shots ..........etc etc. AF-S is correct Single centre AF point only Shake reduction OFF Last edited by pschlute; 03-13-2021 at 07:04 PM.

03-13-2021, 07:12 PM	#5
andy271 Senior Member Join Date: Mar 2018 Posts: 192 Original Poster	thanks peter when i did fine ajustments with the lenscal chart i have i cant rember if i turnes shake reduction off ,ill try again so is 6 foot the correct distance i think last time i did 4 foot

03-13-2021, 07:23 PM	#6
pschlute Moderator Loyal Site Supporter Join Date: Mar 2007 Location: Surrey, UK Photos: Gallery Posts: 8,219	Originally posted by andy271 thanks peter when i did fine ajustments with the lenscal chart i have i cant rember if i turnes shake reduction off ,ill try again so is 6 foot the correct distance i think last time i did 4 foot On a tripod you want SR off. The distance you choose is always a compromise. 6 foot for a 43mm lens is about right. Oh and leave the aperture at 1.9

03-13-2021, 07:27 PM	#7
andy271 Senior Member Join Date: Mar 2018 Posts: 192 Original Poster	another thing peter if i put it on a tripod at 6 feet how do i get a 45 degree angle

03-14-2021, 02:15 AM	#8
K(s)evin Site Supporter Join Date: Sep 2010 Location: Colorado Posts: 476	The target (chart) needs to be at a 45 degree angle. Laid back, like on a podium or book stand, with the camera sensor at a 90 degree angle (straight up & down) in relation to the chart.

03-14-2021, 04:32 AM - 1 Like	#9
aslyfox Seeker of Knowledge Join Date: Aug 2016 Location: Topeka, Kansas Photos: Gallery \| Albums Posts: 24,583	reviewing this article might be of some help: Quote: Fixing Front and Back Focus Introduction Fixing Front and Back Focus - Introduction - In-Depth Articles

03-14-2021, 05:24 AM	#10
pschlute Moderator Loyal Site Supporter Join Date: Mar 2007 Location: Surrey, UK Photos: Gallery Posts: 8,219	Originally posted by aslyfox reviewing this article might be of some help: Thanks for posting that link. I was trying to find it myself, but sadly failed

03-14-2021, 05:32 AM	#11
andy271 Senior Member Join Date: Mar 2018 Posts: 192 Original Poster	yes i already did this but it was with Datacolor SpyderLENSCAL ill try it again just incase i had steady shot on allso i was around 4 foot away i wander if 6 foot would be better as i said with tripod and pixel shift i love the lens ,my zeiss lenses are sharper i can clearley see that but i do love and hate the 43mmltd

03-14-2021, 06:16 AM	#12
BarryE Site Supporter Join Date: Jan 2013 Location: Hampshire, UK Posts: 1,654	Andy, may not be an issue, but the 43mm and k-1 combination has been a problem for me with shutter shock, especially between 1/80 and 1/160 sec. Could this be clouding your tests ...?

03-14-2021, 07:09 AM	#13
andy271 Senior Member Join Date: Mar 2018 Posts: 192 Original Poster	hi barry very good point i will double check when the weather is a bit better ill go to the same forest and make sure ive got a high shutter speed

03-20-2021, 09:59 AM	#14
andy271 Senior Member Join Date: Mar 2018 Posts: 192 Original Poster	Hi guys just thought I would post how I got on with the 43m Ltd afterfine tune adjustment . This is a funny taleas I went out yesterday and took lots of photos got in and resiled Ihadn't inserted a memory card I was fuming LOL A whole day wasted Today went out againand I have to say with doing the fine adjustment I am very veryhappy The 3d pop out of mylens at f3.2 is remarkable I found ISO 400 to be giving me around1/320th second and had no shutter shock . When I did the fineadjustment I made sure the tripod was level with the chart in my caselens cal I turned off shakereduction and had aperture at 1.9 wide open around 6 feet away im actually shockedat how good this lens is once you have learned how to use it properlyit will give you colour and rendition which is lacking in today'slenses I cant believe howgood it is Setting I used Phase detection af AFS active area spot Af Assist Light On Ae Metering MultiSegment Shake Reduction On Link Exposure AndFocus Points On AE-L With Af LockedOn Viewfinder Light On Change AF ButtonType 2 Af Fine Tune For MyLens Was -9 ---------- Post added 03-20-21 at 10:21 AM ---------- Having Looked Though All The Pics 1/160th Are Not As Sharp As 1/320th Its A Big Difference ,This Was An Overcast Day So iso400 Was Giving Me What I Needed

03-20-2021, 10:29 AM	#15
BarryE Site Supporter Join Date: Jan 2013 Location: Hampshire, UK Posts: 1,654	Originally posted by andy271 [/COLOR]Having Looked Though All The Pics 1/160th Are Not As Sharp As 1/320th Its A Big Difference ,This Was An Overcast Day So iso400 Was Giving Me What I Needed Some folk have not seen shutter shock with this lens. Sounds like you have. There can be a significant difference in IQ between shutter speeds in/out of the troublesome range.