Pentax 150-450mm


johnriley

Link Posted 31/05/2015 - 16:05
I've done a blog over on EPZ now that I have actually managed to get out and shoot a few images.

In summary, it's a great lens, sharp, heavy, and the bokeh is sublime.

I've no doubt practice with it and better light will give better images yet, but so far it's very pleasing.
Best regards, John

johnriley

Link Posted 31/05/2015 - 16:09

Mike-P

Link Posted 31/05/2015 - 18:19
Did you manage to test the AF speed with the 1.4X John ?
No equipment list here but thanks for taking an interest. My Flickr
Last Edited by Mike-P on 31/05/2015 - 18:21

McGregNi

Link Posted 31/05/2015 - 19:18
I had a quick look at your shots there John, and I can only agree on the Bokeh in particular .... silky smooth, it doesn't look like that lens has any aperture blades at all! I can see that it will help a lot with all kind of subjects, as the background is rendered in such a pleasing neutral manner so as not to distract at all.
My Guides to the Pentax Digital Camera Flash Lighting System : Download here from the PentaxForums Homepage Article .... link
Pentax K7 with BG-4 Grip / Samyang 14mm f2.8 ED AS IF UMC / DA18-55mm f3.5-5.6 AL WR / SMC A28mm f2.8 / D FA 28-105mm / SMC F35-70 f3.5-4.5 / SMC A50mm f1.7 / Tamron AF70-300mm f4-5.6 Di LD macro / SMC M75-150mm f4.0 / Tamron Adaptall (CT-135) 135mm f2.8 / Asahi Takumar-A 2X tele-converter / Pentax AF-540FGZ (I & II) Flashes / Cactus RF60/X Flashes & V6/V6II Transceiver

johnriley

Link Posted 31/05/2015 - 19:42
Mike-P wrote:
Did you manage to test the AF speed with the 1.4X John ?

Sorry no, it was a poor day really. I will try locally tomorrow and make a point of doing this and get back to you.
Best regards, John

cardiffgareth

Link Posted 31/05/2015 - 20:53
I agree that bokeh is smooth! Looks a very nice lens!
Gareth
Welsh Photographer

My outfit: K1 gripped - Pentax D FA 24-70mm - Sigma 70-200mm OS HSM - Pentax modified DA* 60-250mm f4 - Irix 15mm Firefly - Sigma 50-500mm - FA 50mm f1.4 - Tamron SP 90mm macro - Pentax AF 540 FGZ Ii

My Flickr
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My 500px

johnriley

Link Posted 01/06/2015 - 10:09
johnriley wrote:
Mike-P wrote:
Did you manage to test the AF speed with the 1.4X John ?

Sorry no, it was a poor day really. I will try locally tomorrow and make a point of doing this and get back to you.

Subjectively, it didn't seem to make a lot of difference, so I ran a test using an online stopwatch. Obviously it depends on how far the lens has to focus as to how long it will take, but with identical parameters we can establish the difference between speed with and without the converter.

Each shot was started at an aim point on the display, after which the lens was defocused the same amount every time ready for the next aim point. The aim point is irrelevant, but it was 5 second intervals. The delay was observed by seeing what the display on the shots taken was. This includes any operator variation, but that too will even out after a lot of shots.

Without the converter, the delay between the shutter release being pressed, the lens focusing and the shot being taken varied from 0.2s to 0.4s and averaged out at 0.3s

With the converter, the delay varied between 0.2s and 0.4s and averaged out at 0.3s

In summary, the converter made no difference whatsoever, Hope that helps, I'll post more into on the lens as I use it more.
Best regards, John

Mike-P

Link Posted 01/06/2015 - 10:44
Thanks John, very helpful.
No equipment list here but thanks for taking an interest. My Flickr

dcweather

Link Posted 02/06/2015 - 23:39
John, if you have the DA*300 how do you feel the focus speed and lock on compare with that, with and without the converter in each case?
Dave

johnriley

Link Posted 02/06/2015 - 23:58
Unfortunately Dave I don't have the 300mm, otherwise I'd be happy to try it out.
Best regards, John

dcweather

Link Posted 05/06/2015 - 23:34
johnriley wrote:
Unfortunately Dave I don't have the 300mm, otherwise I'd be happy to try it out.

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That's a shame. I think the majority of birding and wildlife Pentax users will look at this and ask themselves two questions. Compared to the DA*300+ 1.4x TC how fast does it focus at 420mm and how does the image quality compare.
Dave

wvbarnes

Link Posted 06/06/2015 - 15:09
I agree, I have the 300 star F4 and converter for my K3 and struggle to see what the bulk and price of the new lens delivers to us now. Presumably its all about the 35mm size sensor body coming in the autumn when it will show off the larger sensor advantage.

dcweather wrote:
johnriley wrote:
Unfortunately Dave I don't have the 300mm, otherwise I'd be happy to try it out.

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That's a shame. I think the majority of birding and wildlife Pentax users will look at this and ask themselves two questions. Compared to the DA*300+ 1.4x TC how fast does it focus at 420mm and how does the image quality compare.
Dave

johnriley

Link Posted 06/06/2015 - 17:48
For me, what it delivers is the versatility of the zoom. Not everything is at the longest end of the zoom.
Best regards, John

dcweather

Link Posted 10/06/2015 - 22:58
There are now 3 reviews on the "other" site and they are amazing. Two 9's and a 10 and faster focusing than the DA* 300 and sharper with the TC (allegedly of course"
Found this odd though:-
"...keeper rate rate is much higher with this lens then with the da*300 (+tc) and it feels like you have a higher buffer/burst rate. High iso looks cleaner as well comparing it with the da*300+tc"
Why? Surely these are camera/sensor issues not lenses?
Dave

whatsthisbuttondo

Link Posted 25/08/2015 - 09:24
I wonder if i was to get this lens would i need my da*300, i read the quality of the zoom is so good that it matches the prime?
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