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04-17-2015, 05:08 AM   #856
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to me it looks like your 300/4 is front focusing. the TC makes it worse.

04-17-2015, 05:29 AM   #857
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QuoteOriginally posted by Wild Mark Quote
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
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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
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The focus seems fine to me :

300 alone :


300 + TC :


04-17-2015, 05:48 AM   #860
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Looks like we need a 300mm + TC thread.
04-17-2015, 06:07 AM   #861
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Try without SR. You can be surprised. I was.
04-17-2015, 06:12 AM   #862
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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
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QuoteOriginally posted by timautin Quote
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
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QuoteQuote:
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
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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.
04-17-2015, 06:45 AM   #866
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QuoteOriginally posted by timautin Quote
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
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It means that SR algorithms could use an improvement. Maybe.
04-17-2015, 07:07 AM   #868
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QuoteOriginally posted by timautin Quote
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
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QuoteOriginally posted by aurele Quote
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
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QuoteOriginally posted by timautin Quote
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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