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Forum: Pentax SLR Lens Discussion 8 Hours Ago  
What Are Your Experiences with 28mm Lenses?
Posted By GUB
Replies: 145
Views: 6,966
Great work guys.
I had a look at the distance scale on the A and now I commiserate with you!
The first digit down from infinity is 3 metres and it is only about 5mm from the stop.
I guess I am just used to it. And the use of Live view and focus peaking.
I checked and all my other Pentax 28s are the same except for the takumar which is about 8mm
And looking at off brands they are all similar.
I guess it is a function of the constant pitch of a helicoid and the need to get all focusing done in one rotation. And the rest is pure physics. Have a finer pitch helicoid and you are lengthening your closest focus.
Forum: Travel, Events, and Groups 1 Day Ago  
Kiwi Pentaxians
Posted By GUB
Replies: 17,483
Views: 1,277,608
And we will probably say the same about them not going mirrorless one day.
Forum: Pentax SLR Lens Discussion 1 Day Ago  
Pentax vs Tamron budget 135mm MF
Posted By GUB
Replies: 23
Views: 562
Must be sample variation but my Tak Bayonet 2.5 is sharper wide open than any of my other Pentax . That is maybe except for the FA which I haven't compared against. It makes the M135 3.5 look really sad as well as the old Tak 5 element 2.5s.
Forum: Pentax SLR Lens Discussion 1 Day Ago  
Pentax vs Tamron budget 135mm MF
Posted By GUB
Replies: 23
Views: 562
Don't forget the Takumar Bayonet group.
I have the 135 2.5 and rate it better open than My M 135 3.5. Others in the reviews state this too.
Haven't put it up against my FA yet tho.
I generally agree with all the positive comments in the reviews.
It is interesting how the earlier reviews tend to be more negative than the later ones.
Takumar 135mm F2.5 Bayonet Reviews - Non-SMC Pentax Prime Lenses - Pentax Lens Reviews & Lens Database
Forum: Pentax SLR Lens Discussion 2 Days Ago  
Details on lens-collar/tripod-mount for Takumar 200mm f3.5?
Posted By GUB
Replies: 12
Views: 646
Same place as those tap washers, fuse wire etc when you need them. When you find them let me know!
The thing about the Tak 200 one is it just slides off the back when loose.
Forum: Pentax SLR Lens Discussion 2 Days Ago  
What Are Your Experiences with 28mm Lenses?
Posted By GUB
Replies: 145
Views: 6,966
I dont have the K28 but I have Takm42s, M 3.5s , Tak Bayonets and As as well as one of each M28 2.8 mk1 and mk11
I put the Pentax A, the Bayonets and the M28 2.8 mk11 at the top
The M 28 3.5s and the Taks together just behind and the M28 2.8 mk1 is a dog. This is open.
There is a crispness almost a harshness to the later ones that set them ahead. But I wonder if that is what others are seeing as a flaw? The M28 3.5 is more like a usual Pentax image.
Forum: Pentax SLR Lens Discussion 2 Days Ago  
What Are Your Experiences with 28mm Lenses?
Posted By GUB
Replies: 145
Views: 6,966
I am curious about what aperture you and the others with issues tend to run at.
I am on the K-1 and routinely shoot f4 or f5.6.
I am rarely at f8 or more.
And because the 28s are not much of a bokeh machine it is only bad lighting conditions that make me use them wide open.
Given that they seem to be all 5 bladed irises and they don't round off at all stopped down I wonder if you are bumping into extra diffraction/interference issues from the corners of the pentagons aggravated by stopping down.
Forum: Pentax SLR Lens Discussion 3 Days Ago  
What Are Your Experiences with 28mm Lenses?
Posted By GUB
Replies: 145
Views: 6,966
Then it is not focusing that is the issue.
Forum: Pentax SLR Lens Discussion 3 Days Ago  
What Are Your Experiences with 28mm Lenses?
Posted By GUB
Replies: 145
Views: 6,966
Cmon guys if you apply a circle of confusion (coc) of .005mm to a 28mm at f4 and focus at 40 metres then everything between 20 metres and infinity has a maximum coc of .005mm . This is the size of a K-1 or K5 pixel and is actually 1/6 of the standard coc applied to full frame.
The issue is more - how can you miss focus?
Time to find another reason for soft images - not just focusing.
Forum: Pentax SLR Lens Discussion 4 Days Ago  
What Are Your Experiences with 28mm Lenses?
Posted By GUB
Replies: 145
Views: 6,966
I am sorry but I don't understand these issues. I find the A28 and the Tak Bayonet 28mm the easiest of lenses to focus.
Have you checked that your lenses are achieving infinity?
Have you checked that they are not stopping past infinity. (my A50 1.7 does).
If they are stopping nicely at infinity how hard can it be to take a landscape shot?
Even at f4 anything more than say 40 meters (arguably) can be considered infinity so just smack the lens to the end.
I tend to use my 28mm lenses at the open end and maybe that is the difference?
In Liveview with these sharp lenses used open the focus peaking is strong and obvious.
Forum: Pentax SLR Lens Discussion 5 Days Ago  
What Are Your Experiences with 28mm Lenses?
Posted By GUB
Replies: 145
Views: 6,966
Try Live view and see if you miss focus. (focus peaking on) Easy-as with a 28mm.
Forum: Pentax SLR Lens Discussion 04-13-2021, 01:07 AM  
Details on lens-collar/tripod-mount for Takumar 200mm f3.5?
Posted By GUB
Replies: 12
Views: 646
I have a Super Tak 70 - 150 that has a very similar mount. I can almost spread it enough to mount it. It has two tracks of concentric rings where the felt is on the 200 one. A mill spun off these would probably do the job - admittedly a metal on metal connection. The ring is a slightly lighter weight collar compared to the 200 but would for most would appear identical. The tightening screw is all black compared to the black and silver of the 200.

Super-Takumar Zoom 70-150mm F4.5 Reviews - M42 Screwmount Zoom Lenses - Pentax Lens Reviews & Lens Database
Forum: Pentax DSLR Discussion 04-11-2021, 04:02 PM  
Are cameras getting too boring = sophisticated?
Posted By GUB
Replies: 61
Views: 2,703
I am going to get myself into sooooooooo much trouble here but what you have defined is the stuff that makes the difference between the K3ii and the K3iii
Of course there will be a boost in iso performance and dynamic range but Ricoh isn't really crowing about that.
Forum: Travel, Events, and Groups 04-09-2021, 03:23 AM  
Kiwi Pentaxians
Posted By GUB
Replies: 17,483
Views: 1,277,608
That is interesting Ross. I understand off peak has it's grid load advantages but I have been unable to find any information that confirms the percentage of renewable increases at night. I find it interesting because I have always considered that the hydro stations smoothed out this variation by virtue of their reservoir storage of multidays. So do you have a source that explains this? This is the most comprehensive site I can find and i have never seen it over 80%. But maybe I am not looking late enough at night.
Power System Live Data | Transpower
And of course burning gas and coal at stations to supply electricity for cars is considered more efficient than the cars engines to operate so no argument there.
Great to see the path you are steering your company.
I don't take any particular footprint reducing path on my farm. But my bull beef operation is a remarkably low input process anyway utilising a waste product (bobby calves and out of spec powder) that produces an in demand high quality protein.
I have always used sustainability as my driver which has guided me to retire a lot of my difficult hill country. I can claim I have retired a third of my property from production and have done this for no financial gain. The land retired into gorse which is not eligible for credits. Interestingly this is now regenerating into 2nd growth which probably is eligible for credits. But I have never farmed something I didn't believe in ( wool lamb bull beef) and it is going to be difficult to start now.
Forum: Travel, Events, and Groups 04-09-2021, 01:54 AM  
Kiwi Pentaxians
Posted By GUB
Replies: 17,483
Views: 1,277,608
Currently in NZ for me the electric vehicle dogma is just more fake news. While we have only 80% renewable power and still have coal fired stations in the grid then any addition to grid load is coal fired. The fashionable adoption of Electric Vehicle technology is clearly and simply an addition load on the grid. So in New Zealand EVs are coal fired. I would have had some sympathy if rather than subsidise purchasers of EVs the Gov had contributed to a special fund to augment the current renewable power.
Forum: Travel, Events, and Groups 04-06-2021, 01:35 AM  
Kiwi Pentaxians
Posted By GUB
Replies: 17,483
Views: 1,277,608
looks like an Austen 10 tyre from the later Miocene.
Forum: Travel, Events, and Groups 04-06-2021, 01:15 AM  
Kiwi Pentaxians
Posted By GUB
Replies: 17,483
Views: 1,277,608
Yeah talk about inappropriate!! - it hadn't even been introduced to my K-1 by that point ! A violation of societal rules!
Forum: Travel, Events, and Groups 04-06-2021, 12:38 AM  
Kiwi Pentaxians
Posted By GUB
Replies: 17,483
Views: 1,277,608
Scored a magic lantern lens off TM. $15. A Spencer 10inch f4. After gluing up an adapter I quickly threw it together without even cleaning my finger prints off the glass. (Wanted to check I had my basic physics of focal length working.) Might be a shame to clean it - after all we used to put vaseline on lens filters!.
You can trust the real estate of the K-1 to bring out the best in this random piece of old glass.
Forum: Travel, Events, and Groups 04-05-2021, 05:19 AM  
Kiwi Pentaxians
Posted By GUB
Replies: 17,483
Views: 1,277,608
Yeah i read it several times before I worked it out. But hey you are nothing like Swaneflitte whose every sentence is a riddle!
The Mangaturuturu area of Ruapehu has got to have some of the most beautiful spots on the mountain. Here is Tom's Garden. Our club named the area such after Tom Luff showed us his secret spot about a month before he passed away. The crazy thing is the buttercups flower there all summer despite the fact they are finished elsewhere on the mountain by Christmas. Easter and they are still going. Probably something to do with the fountain of water in the background. A stream spraying out from what is presumably a lava tube. Also the area is a sheltered afternoon suntrap on smooth rock.
Forum: Travel, Events, and Groups 04-05-2021, 03:19 AM  
Kiwi Pentaxians
Posted By GUB
Replies: 17,483
Views: 1,277,608
Ahaa there you are Stillwell. Good to hear from you! Hey everyone - this is the bloke to blame if I take crappy pictures with the FA400 !!
Seems to focus nice and snappy - just couldn't face taking it with me onto Ruapehu this weekend. Already had upwards of three Kg of gear. Mind you I saw a Falcon perched about 50metres away - it would have been handy!
Forum: Travel, Events, and Groups 04-05-2021, 03:09 AM  
Kiwi Pentaxians
Posted By GUB
Replies: 17,483
Views: 1,277,608
Yeah thought you might have been tempted! Trouble was we were all day away from the hut bush bashing anyway.
Forum: Travel, Events, and Groups 04-01-2021, 03:20 AM  
Kiwi Pentaxians
Posted By GUB
Replies: 17,483
Views: 1,277,608
Yep comparatively FF weak for telephoto and macro dof. The dof thing doesn't matter in terms of my K01 vs K-1 coz you can always back away 50% with the K-1 and crop in to the K01 size and mps. But your K3s have a higher pixel density for what it is worth.
And you have the apsc lenses to go with.
From my perspective almost all my lenses are FF and quite simply if you express the information available from a given lens in terms of area (like megapixels) then FF imparts twice the information of apsc. (1.5 times on each dimension). And the sweet spot theory makes sod all difference. So the K-1 for my legacy glass is a no-brainer.
One thing about when I stepped from my K01 to the K-1 my reasoning was there was simply not enough bang for buck going from K01 to K3 (in my opinion). (That says a bit about my opinion about upgrading from K3 to K3iii :o )
Heading off to Mangaturuturu Hut on Ruapehu for three nights. Call in for a coffee (and a bunk for the night) if you feel like it anyone. Only an hour 30 in from the Turoa rd.
Have a great Easter everyone.
Forum: Travel, Events, and Groups 04-01-2021, 01:28 AM  
Kiwi Pentaxians
Posted By GUB
Replies: 17,483
Views: 1,277,608
The K-1 is only 200 grams heavier guys.
And remember the best artists have always suffered!
Forum: Pentax SLR Lens Discussion 03-31-2021, 04:10 AM  
135mm comparison : Samyang 135/2, Takumar 135/2.5, Sigma 135/1.8
Posted By GUB
Replies: 8
Views: 539
My results put the Tak Bayonet at the top of the heap. But notice my M42 Takumar 135 2.5 is version one.
Every time I put my M series up against anything it fails dismally. But could well be sample variation.
The poor old much maligned Takumar Bayonet group. - PentaxForums.com
Forum: Pentax SLR Lens Discussion 03-29-2021, 03:06 PM  
What were the last 2 lens you purchased and why?
Posted By GUB
Replies: 85
Views: 3,798
Same as my M 100 f4 non bellows. It makes a very hexagon f22.
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