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11-16-2023, 04:50 PM - 2 Likes   #16
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Really the only lens adapter relevant to the pentax DSLR range is the M42 to PK adapter. The main lenses you might adapt in that way are the takumars, but there are lots of M42 screwmount lenses out there, but the fact is lens technology has left these vintage lenses behind in terms of relative performance. While I have found it of interest to see what telephoto lenses from the 1960's purchased for as little as a tenner can do, objectively anyone with a serious interest in eg wildlife photography wouldn't bother. A modern lens for the camera with AF etc is obviously the way to go. For interest you can check out eg my reviews of tamron 400mm f6.9; tokina 400mm f6.3.
The other possibilities have been mentioned: leitax mount swap, adapt a medium format lens. The latter IS a way of getting quality optics at a bargain price - I saw a 645 300mm and a 645 400mm each sell for around three hundred () a few months ago.
PS I shall be listing a 300mm f2.8 (tokina), and a sigma 400mm zoom here on PF in due course... addendum otherwise the readily available 300-2.8 is the tamron adaptall, no adapter needed just the right detachable mount.


Last edited by marcusBMG; 11-17-2023 at 07:02 AM.
11-16-2023, 05:22 PM   #17
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If I had a "sports photography business" Pentax would not be my preferred platform.

As a hobbyist though, I'll stick with the gear I have and love. The DFA 150-450 and K-3 Mark III work beautifully together.
11-16-2023, 08:05 PM   #18
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The 150-450mm zoom is very heavy, but if you are not moving around much (like shooting sports from one position) a monopod would do fine. I have walked around a lot with my 150-450mm, both with and without a monopod. When I first bought it my initial thought was "Hand-held? No way!" But now I shoot handheld quite frequently.
Have you checked out the many quality shoots from many members on the 150-450mm lens site:
Post your HD PENTAX-D FA 150-450mm F4.5-5.6 ED DC AW pictures! - Page 231 - PentaxForums.com

But if you are prepared to buy second-hand, there are discontinued Pentax telephoto lenses available from Japanese shops, many of whom have very good reputations - eg
https://www.ebay.com.au/itm/313778457573?chn=ps&_ul=AU&norover=1&mkevt=1&mkr...gaAupxEALw_wcB

Just do some googling with keywords Pentax 560mm 600mm etc and see what is around.
11-16-2023, 08:40 PM - 1 Like   #19
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This spring I bought an antique 400mm/f5.6 TeleTakumar for an extremely low price. It came to me looking brand-new. As an M42-mount lens I use the Urth adapter with it, and having lots of experience with mid-range rifle shooting I find that the techniques for that carry over quite well to shooting pictures without using a monopod or other support.

The picture below was taken in Lamar Valley using a K100D, the 400mm, and Urth adapter, and was taken while standing unsupported by the side of the road. Having grown up using manual focus I have no problem doing that on the fly, and exposure is pretty simple once you learn to use the "AE-L" button (there is no green button on the K100D). Set up the custom menu items correctly (aperture ring and AE-L Tv Shift) and it works quite well. I've even gotten Av Mode to work well if I dial in enough exposure adjustment now. Focus with the matte screen on the K100D can be a little fussy but I usually have it so that I focus wide open, spin the aperture to about f/11, set the exposure, and shoot. Quite fast once you've done it a few times.

Having the adapter semi-permanently on my old DSLR gives me the use of my really good old lenses (50mm/f1.8 and 135mm/f2.5) for other stuff, too.

Then again, I can't spend much since I'm retired and on a fixed income. Note that the adjective depends on the subject:
- I am frugal.
- HE is cheap.
- THAT GUY over there is a skinflint.

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11-16-2023, 09:21 PM   #20
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QuoteOriginally posted by Blackwing1 Quote
This spring I bought an antique 400mm/f5.6 TeleTakumar for an extremely low price. It came to me looking brand-new. As an M42-mount lens I use the Urth adapter with it, and having lots of experience with mid-range rifle shooting I find that the techniques for that carry over quite well to shooting pictures without using a monopod or other support.

The picture below was taken in Lamar Valley using a K100D, the 400mm, and Urth adapter, and was taken while standing unsupported by the side of the road. Having grown up using manual focus I have no problem doing that on the fly, and exposure is pretty simple once you learn to use the "AE-L" button (there is no green button on the K100D). Set up the custom menu items correctly (aperture ring and AE-L Tv Shift) and it works quite well. I've even gotten Av Mode to work well if I dial in enough exposure adjustment now. Focus with the matte screen on the K100D can be a little fussy but I usually have it so that I focus wide open, spin the aperture to about f/11, set the exposure, and shoot. Quite fast once you've done it a few times.

Having the adapter semi-permanently on my old DSLR gives me the use of my really good old lenses (50mm/f1.8 and 135mm/f2.5) for other stuff, too.

Then again, I can't spend much since I'm retired and on a fixed income. Note that the adjective depends on the subject:
- I am frugal.
- HE is cheap.
- THAT GUY over there is a skinflint.
Nice shot! I am impressed by this type of experience. I have poor vision and autofocus is my friend. I have floaters and monocular double vision and all kinds of things that make my ability to focus quickly with a manual lens poor without a split screen focusing screen.
11-17-2023, 04:35 AM   #21
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A very good alternative to a manual telephoto lens is adapting an telescope. An apochromatic refractor 432/72 will usually have a very good image quality most time better then the comparable 400/5.6 (the telescope has f=6.0). The main disadvantage is, there is no aperture. Then only manual focus, but a very precise one and a stable tripod is mandatory and they are for sure not usable for sports photography. You can also rebuilt them for bird watching and of course use them for star gazing. Some are even built for this multi purpose use, like the omegon Photography Scope 72/432 ED OTA.
You will need a T2 adapter and a field flattener additionaly. Even with all the additonal stuff needed the investment is a very reasonable one.
11-17-2023, 08:57 AM   #22
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QuoteOriginally posted by mlag Quote
Adapters are always manual focus and exposure...less suited for wildlife/sports.

An answer in stages:

1) if you are a professional sports or wildlife photographer, changing system might be the right only choice to have more (new equipment) options...

But if you want to stay in pentax:
2) the pentax 150-450 isn’t bad at all, even excellent, and it can be pushed with the 1,4x TC to 630mm. I know TC adapters should have disadvantages, but somehow this combo works well, above average/expectation of all TC lens combo’s.
3) there are quite some 400...500mm lenses from Sigma available secondhand, some very decent like the sigma zooms/bigma’s, some excellent like the sigma 500mm f4,5. Scanning a few months 2nd hand fora will yield some options. Even avoiding ebay and similar, I was able to buy several options from the more reputed 2nd hand camera and lens shops, including 6 month warranty, for reasonable prices (<<< than the price of my final acquisition 150-450).
4) if you are willing to spend (much) more than 2000$ , there are even some pentax f2.8 400 or 600 mm options out there .

The last point I avoid.

And to be honest, in point 3 you can remove the word ’final’... LBA I am afraid. It is the only reasonable explication why I did buy last week a vintage pistol grip Novoflex 40cm f/5.6 , damned, it even works better than expected.

And finally, in my experience, from 500mm , walking closer is sometimes the better option....
Can you tell me in what settings you think the 150-450mm is excellent, so I can way pros and cons of investing in that lens? Thank you!

11-17-2023, 10:50 AM   #23
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You should study the on-site in depth review:

HD Pentax-D FA 150-450mm F4.5-5.6 Review - Introduction | PentaxForums.com Reviews

I would describe the lens as a quality all-rounder. Crisp sharp high contrast images straight out of the camera. Just outgunned by the specialist offerings from eg canon, and, from what I've read, pentax bodies outperformed AF wise by the canon camera bodies except perhaps for K3-iii. However lenses like the canon 400-2.8, 500-4, 600-4, 800-5.6 cost five digit sums!
11-17-2023, 06:40 PM   #24
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Little birds should be as challenging as sports:
Eye focus for birds and animals - PentaxForums.com
11-17-2023, 09:35 PM   #25
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Thank you for this link. I will keep my eyes open and save my pennies!
11-18-2023, 12:52 PM   #26
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Thank you, Paul, for the link. I wish it was still available. I almost always use a monopod (sports) or a tripod (astro), so weight isn't a huge issue. I will try to hunt for one...
11-26-2023, 05:26 AM   #27
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QuoteOriginally posted by loyalt Quote
How well do adapters really work?
I am wondering if anyone has used adapters to get a longer "sports-able" lens from another maker to work on the K-3 Mark III. I would love to have the ability to use a 400mm lens in my sports photography and wonder if that is at all worth the trouble. I am hoping a 300mm f2.8 Pentax lens will come out, and I do have the 300mm f4, but would like to have the choice of a longer lens ability for my sports photography business. Any advice on those who have tried adapters with non-K mount lenses would be useful. Thank you!


Read more at: Lens Adapters - PentaxForums.com
Loyalt, is it essential that you need a f2.8 lens for sports to provide minimal depth of field for backgound suppression? I photograph for a local athletics club and find the K-3iii and D FA HD 150-450mm f4.5-5.6 ED DC AW Lens combination very competent. As an amateur, I don't need a fast turn round of images, I can spent time in post processing suppressing the background if required.
I shoot RAW and find that the excellent noise attenuation of the K-3iii at higher ISOs, along with noise reduction from ACR, in most cases provides very good image quality. Of course investing in modern noise reduction software reduces image noise even further and retains sharpness. If you want longer reach, the 1.3 and 1.7 crop factors on the camera are available. Modern software can readily compensate for the lack of light gain compared to an expensive f2.8 lens.
I find the 150-450 lens sharp wide open, but stopping down by half a stop really delivers. This camera and lens combination provides almost instantaneous focus lock on and tracks with ease. I use the OVF with back button focus. I hope this is useful. Food for thought.

Last edited by Robert N; 11-28-2023 at 01:56 AM. Reason: Spelling correction
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