HD PENTAX-D FA ★ 70-200mm F2.8 at 5th February?

Wild Mark · 04-17-2015, 05:08 AM

to me it looks like your 300/4 is front focusing. the TC makes it worse.

Shanti · 04-17-2015, 05:29 AM

Originally posted by Wild Mark

to me it looks like your 300/4 is front focusing. the TC makes it worse.

I had same problem..had to send in myDA* 300 for adjsutment,got very annoying with bird pics

Glorfindelrb · 04-17-2015, 05:32 AM

Is the AF adjustments saved separately for lens+TC or just the lens ? If it is you may try this first.

timautin · 04-17-2015, 05:40 AM

The focus seems fine to me :

300 alone :

300 + TC :

audiobomber · 04-17-2015, 05:48 AM

Looks like we need a 300mm + TC thread.

JimmyDranox · 04-17-2015, 06:07 AM

Try without SR. You can be surprised. I was.

timautin · 04-17-2015, 06:12 AM

Yep I will ! For the front focus test shots I put it off.
Indeed a new thread may be more suited.

Wild Mark · 04-17-2015, 06:14 AM

Originally posted by timautin

The focus seems fine to me :

300 alone :

300 + TC :

they look OK although near focusing is always going to perform better.

I have just noticed you had SR on when mounted to a tripod - that is likely to be your problem. With extra reach the SR on when mounted on a tripod gets even worse, especially when ISO ramps up.

timautin · 04-17-2015, 06:26 AM

Quote:

I have just noticed you had SR on when mounted to a tripod

Yes, I will give it another try. And I will also try again the 300 alone without SR.
This is sad though, it would mean that the 150-450 isn't stabilized either...

Glorfindelrb · 04-17-2015, 06:40 AM

Why do you want a stabilized lens on a tripod ? No SR system (IBSR or ILSR) is precise enough to be usefull on a (locked) tripod as far as I know, few lenses have tripod detection but only to stop SR automatically when on tripod.

audiobomber · 04-17-2015, 06:45 AM

Originally posted by timautin

Yes, I will give it another try. And I will also try again the 300 alone without SR.
This is sad though, it would mean that the 150-450 isn't stabilized either...

You should be using delayed shutter release or a remote when on tripod, both of which disable SR.

JimmyDranox · 04-17-2015, 06:55 AM

It means that SR algorithms could use an improvement. Maybe.

aurele · 04-17-2015, 07:07 AM

Originally posted by timautin

Both taken on tripod, with shake reduction on

On the manual they say to desactivate SR when on tripod.

When you put a DSLR on tripod with SR activated and continuous AF, the SR gets crazy (the K-x / k-r at least) and shakes in every direction even though there is no mouvement

thibs · 04-17-2015, 07:22 AM

Originally posted by aurele

On the manual they say to desactivate SR when on tripod.

When you put a DSLR on tripod with SR activated and continuous AF, the SR gets crazy (the K-x / k-r at least) and shakes in every direction even though there is no mouvement

Got that with my Tammy 500/8. Was very funny to see for a minute in LV but that's it.

wkraus · 04-17-2015, 10:12 AM

Originally posted by timautin

You also download a few other samples here : http://timphoto.free.fr/__autres/Pentax/TC_1.4/300_vs_420.zip

Regardless of the lens or AF performance, these are GREAT pics!

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04-17-2015, 05:08 AM	#856
Wild Mark Veteran Member Join Date: Jun 2013 Location: Newcastle Photos: Gallery \| Albums Posts: 1,954	to me it looks like your 300/4 is front focusing. the TC makes it worse.

04-17-2015, 05:29 AM	#857
Shanti Veteran Member Join Date: Jul 2012 Location: Western Denmark Photos: Gallery \| Albums Posts: 927	Originally posted by Wild Mark to me it looks like your 300/4 is front focusing. the TC makes it worse. I had same problem..had to send in myDA* 300 for adjsutment,got very annoying with bird pics

04-17-2015, 05:32 AM	#858
Glorfindelrb Veteran Member Join Date: Feb 2012 Posts: 364	Is the AF adjustments saved separately for lens+TC or just the lens ? If it is you may try this first.

04-17-2015, 05:40 AM	#859
timautin Pentaxian Join Date: Feb 2015 Posts: 346	The focus seems fine to me : 300 alone : 300 + TC :

04-17-2015, 05:48 AM	#860
audiobomber Veteran Member Join Date: May 2008 Location: Sudbury, Ontario Photos: Albums Posts: 6,806	Looks like we need a 300mm + TC thread.

04-17-2015, 06:07 AM	#861
JimmyDranox Veteran Member Join Date: Oct 2012 Location: Ploiesti, Romania Photos: Gallery \| Albums Posts: 1,632	Try without SR. You can be surprised. I was.

04-17-2015, 06:12 AM	#862
timautin Pentaxian Join Date: Feb 2015 Posts: 346	Yep I will ! For the front focus test shots I put it off. Indeed a new thread may be more suited.

04-17-2015, 06:14 AM	#863
Wild Mark Veteran Member Join Date: Jun 2013 Location: Newcastle Photos: Gallery \| Albums Posts: 1,954	Originally posted by timautin The focus seems fine to me : 300 alone : 300 + TC : they look OK although near focusing is always going to perform better. I have just noticed you had SR on when mounted to a tripod - that is likely to be your problem. With extra reach the SR on when mounted on a tripod gets even worse, especially when ISO ramps up.

04-17-2015, 06:26 AM	#864
timautin Pentaxian Join Date: Feb 2015 Posts: 346	Quote: I have just noticed you had SR on when mounted to a tripod Yes, I will give it another try. And I will also try again the 300 alone without SR. This is sad though, it would mean that the 150-450 isn't stabilized either...

04-17-2015, 06:40 AM	#865
Glorfindelrb Veteran Member Join Date: Feb 2012 Posts: 364	Why do you want a stabilized lens on a tripod ? No SR system (IBSR or ILSR) is precise enough to be usefull on a (locked) tripod as far as I know, few lenses have tripod detection but only to stop SR automatically when on tripod.

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04-17-2015, 06:45 AM	#866
audiobomber Veteran Member Join Date: May 2008 Location: Sudbury, Ontario Photos: Albums Posts: 6,806	Originally posted by timautin Yes, I will give it another try. And I will also try again the 300 alone without SR. This is sad though, it would mean that the 150-450 isn't stabilized either... You should be using delayed shutter release or a remote when on tripod, both of which disable SR.

04-17-2015, 06:55 AM	#867
JimmyDranox Veteran Member Join Date: Oct 2012 Location: Ploiesti, Romania Photos: Gallery \| Albums Posts: 1,632	It means that SR algorithms could use an improvement. Maybe.

04-17-2015, 07:07 AM	#868
aurele Veteran Member Join Date: Jan 2011 Location: Paris, France Photos: Albums Posts: 3,217	Originally posted by timautin Both taken on tripod, with shake reduction on On the manual they say to desactivate SR when on tripod. When you put a DSLR on tripod with SR activated and continuous AF, the SR gets crazy (the K-x / k-r at least) and shakes in every direction even though there is no mouvement

04-17-2015, 07:22 AM	#869
thibs Pentaxian Join Date: Jun 2007 Location: Belgium Photos: Albums Posts: 7,001	Originally posted by aurele On the manual they say to desactivate SR when on tripod. When you put a DSLR on tripod with SR activated and continuous AF, the SR gets crazy (the K-x / k-r at least) and shakes in every direction even though there is no mouvement Got that with my Tammy 500/8. Was very funny to see for a minute in LV but that's it.

04-17-2015, 10:12 AM	#870
wkraus Pentaxian Join Date: Jan 2013 Location: Near Vienna, Austria Photos: Gallery Posts: 2,059	Originally posted by timautin You also download a few other samples here : http://timphoto.free.fr/__autres/Pentax/TC_1.4/300_vs_420.zip Regardless of the lens or AF performance, these are GREAT pics!