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09-18-2017, 12:12 PM   #16
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QuoteOriginally posted by bdery Quote
The 150-450 is definitely a lens which calls for a monopod. But it's also, by far, the best option for long tele with Pentax currently.
How do you define best?
Considering the other options having faster aperture (Sigma 500mm 4.5) or better reach (DA 560mm 5.6), it's depending on a point of view.

09-18-2017, 01:29 PM   #17
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QuoteOriginally posted by angerdan Quote
How do you define best?
Considering the other options having faster aperture (Sigma 500mm 4.5) or better reach (DA 560mm 5.6), it's depending on a point of view.
Optically. Or, if you will, reach vs optical performances.

I've tested a lot of lenses in recent years, and few lenses delivered as well as the 150-450.
09-25-2017, 11:05 AM   #18
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So, I got myself a used 2x TC, a Kenko Pz-AF 2x Teleplus MC7, which turns my Tamron into a 140-400 f/5.6. I did some test photos this weekend, here is a quick debrief:
  • I was looking for "a 300mm-ish lens", now I know even 400mm is not so long.
  • The IQ of the 70-200 + TC combo is better than what I get from my 100-300.
  • Autofocus works. I got quite a lot of misses, but things got better after I dialed a -5 AF adjustment. I guess some fine tuning could get me better results still, but I found the focusing accurate enough after the adjustment.
  • SR is an issue. I don't know if there is a way to override its focal length setting, but if there is it is off on my K-1, and I didn't find how to change it with a cursory search through the menus.
  • The tripod collar of the 70-200 is not adapted to a K-1 behind a large converter. Reversing the collar improves things somewhat, but it's still not perfectly balanced.
  • Would I get better results with a DFA 150-450, or even a DA* 300? Probably. Is it worth the extra money? Not in my case.

Here are a few test shots, all of them more or less heavily cropped, with 100% crops for illustration of what you can get with this combo. The butterfly is tonemapped, the others received only minor editing.











09-25-2017, 01:02 PM   #19
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QuoteOriginally posted by nono Quote
SR is an issue. I don't know if there is a way to override its focal length setting, but if there is it is off on my K-1, and I didn't find how to change it with a cursory search through the menus.
You can use the Customizable Control Panel.
Pentax K-1 Review - Highlights and New Features | PentaxForums.com Reviews

Press INFO once after powering the K-1 on.
Then press +/-, select the icon to change and confirm with ok.
Now you can scroll down the list to page 6 [35mm] (item 1) or page 5 [SR] (item 1), select.and confirm.

09-25-2017, 10:59 PM   #20
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QuoteOriginally posted by angerdan Quote
You can use the Customizable Control Panel.
Pentax K-1 Review - Highlights and New Features | PentaxForums.com Reviews

Press INFO once after powering the K-1 on.
Then press +/-, select the icon to change and confirm with ok.
Now you can scroll down the list to page 6 [35mm] (item 1) or page 5 [SR] (item 1), select.and confirm.
Yes, I already have focal length here, but it is disabled when the lens itself reports its focal length, it is only usable with full manual or A lenses.
09-26-2017, 02:42 AM   #21
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You can cover the 7th pin on the lens mount.
Lens contact that reports focal length? - PentaxForums.com
The Evolution of the Pentax K-mount - Articles and Tips | PentaxForums.com
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