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Forum: Pentax SLR Lens Discussion 13 Hours Ago  
bird photography lens recommendation for K-50
Posted By marcusBMG
Replies: 20
Views: 529
it worth browsing some of the other threads on this:

Lenses. - PentaxForums.com

my post there links to more...
Forum: Pentax DSLR Discussion 4 Days Ago  
Used K3 from outside the UK.
Posted By marcusBMG
Replies: 10
Views: 593
You need to bear in mind possible duty and VAT. Ducatigaz has purchased from overseas try Pm'ing him how it worked out.
K3's crop up on ebay pretty regularly, but prices are pretty firm, usually 300-400.
Forum: Pentax SLR Lens Discussion 10-22-2020, 12:07 PM  
Sigma 100-300 f4
Posted By marcusBMG
Replies: 10
Views: 585
Well you can compare yours to the one I had - test pics here post :

300mm plus Lens Club: discuss your long lenses - Page 2190 - PentaxForums.com

f8, f11 I was pretty satisfied but like you I was expecting more at 300mm f4. I think which one you have is significant - there are successive generations, EX, EX DG... Mine was a film era EX.
Forum: Pentax Price Watch 10-17-2020, 06:45 AM  
pentax DA 560mm f5.6 on ebay UK
Posted By marcusBMG
Replies: 5
Views: 476
Noticed this - a rare opportunity. item 274530060005

Here's a direct link to the item
https://www.ebay.co.uk/itm/Pentax-560mm-f-5-6-HD-AW-Lens/274530060005?hash=i...IAAOSwMKxfgGZ~
Forum: Troubleshooting and Beginner Help 10-17-2020, 06:25 AM  
Lenses.
Posted By marcusBMG
Replies: 16
Views: 937
Mirror lenses; k100D is not the best IMO due to lack of Live View on the lcd. Mitigated to some extent by the low pixels - makes focus a bit less critical. But I would strongly recommend an optical viewfinder aid like the OME53 or other magnifier, to go with good eyes and then practice.
I quote a regular poster on mflenses.com talking about getting focus right on a K100D with another slow lens the 400mm f7.5 old tamron in my review here, to illustrate the point.






QuoteQuote:

.... However a certain amount of effort was required:

That's diligence for you. But he was using a 6Mpx pentax K100D back in 2009, the good news is that things have really improved since then with magnified Live View, focus peaking, ?more accurate focus cues ... and after I made my support plate (pic 3 above), the handling of the lens + camera (mainly using a monopod) improved dramatically. I also use a VF magnifier and my own experience with K30 and KS2 is that the focus cues are pretty accurate, I was ditching only about 75% of the pics! But I still recommend the basic techniques of focus - review - fine tune, zeroing in on critical focus by to-and-froing through optimum focus and finding a mean position, and bracketing, with this and other lenses (mirrors for example).
And the point is the effort, IMO, is worth it. I mean, when this cheapo delivers probably my best pic so far of one of the linnets by the golf course (regular subjects), that's saying something. These pics are ~1300-1500px crops from the original 5492x3664px 20MPx sensor (in effect a ~4x enlargement or "crop factor"), resized to 999px, a very different ask to the 6MPx of Alegria's K100D but this lens is up to it. This is competitive with or maybe even better than numerous other lenses, inc eg pentax M 400mm 5.6, vivitar 400mm etc.



Forum: Troubleshooting and Beginner Help 10-16-2020, 10:14 AM  
Lenses.
Posted By marcusBMG
Replies: 16
Views: 937
Forum: Lens Clubs 10-15-2020, 12:21 PM  
300mm plus Lens Club: discuss your long lenses
Posted By marcusBMG
Replies: 34,375
Views: 3,418,734
I went back to Angel Bay yesterday to see what might be going on with seal pups 'n all. No pup in sight, just several seals hanging out on the shingle amongst the boulders. And then, this raptor gave a show, hovering in the uplift off the northerly breeze while scanning the scrubby bluffs that rise from the shore. But what is it?
tamron 360B 300mm + pentax 1.7x tc. KS2. Monopod






Forum: Lens Clubs 10-15-2020, 11:04 AM  
300mm plus Lens Club: discuss your long lenses
Posted By marcusBMG
Replies: 34,375
Views: 3,418,734
These ended up being the last pics I obtained of the seal pup, first of the season, at Angel Bay. The pup has weaned at this point, approx 3 weeks after birth. A few days later it was gone, off on its independent life. A pic posted on a notice board from the last day it was seen show it shedding its white coat. Adaptall 63B 400mm f4 + newly acquired 1.7x pentax tc.



Couple more pics with the adaptall-tc combo...


(this was in the interregnum before more covid restrictions came down on us here in N Wales...)


TBC....

---------- Post added 15th Oct 2020 at 20:03 ----------

A second pup has been born in Angel Bay - a couple of days old in this pic. Adaptall 360B 300mm + 1.7x tc.



The pup is gone. Long live the pup.

A few more pics.


hello cutie




BAME? I'm just a SEAL, mate!


This guy looks like he's been doing a few rounds in earnest..


And this balloon came barrelling in on the stiff northerly breeze, and disappeared in the clouds off towards Snowdonia.
Forum: Lens Clubs 10-14-2020, 03:17 PM  
Post your HD PENTAX-D FA 150-450mm F4.5-5.6 ED DC AW pictures!
Posted By marcusBMG
Replies: 2,373
Views: 332,004
A couple from Conwy RSPB - the Great Egrets have been a feature through the summer. And a seal at Angel Bay.
Forum: Pentax SLR Lens Discussion 10-12-2020, 02:32 PM  
need advise on a good cheap lens for nature pictures.
Posted By marcusBMG
Replies: 24
Views: 1,216
This is something of a regular question. The bottom lines are that good telephotos cost, and you get what you pay for.
The most immediately accessible option is the DA/DAL 55-300mm. I have compared my DAL version to a smc 100-300mm f4.5-5.6 and at 300mm the 55-300mm wins hands down. I have also looked at other x-300mm (cosina, sigma...) and again, 300mm tends to be the weakest end of these zooms. And they're slow at 300mm, f6.7 or so.
If you are prepared to go MF, then there are worthwhile options to go longer than 300mm for little $$, like the tokina made 400mm f6.3's and later f5.6's, (numerous versions). Sigma apo 400mm f5.6 and 500mm f7.2's are later, more sophisticated tp's with good iq. The 400 apo (v2) would get the #1 recommend as the best price/iq mf option were it not that examples of this lens invariably suffer from deterioration of an internal cemented group. The 500mm 7.2 is much less common, difficult to find in fact, but normally isn't so afflicted. Both are very ticklish focus due to the compact IF design.

And then there's mirror lenses...
Browse for prev threads eg

Telephoto options - PentaxForums.com

Birds on a Budget - PentaxForums.com

Wildlife lens selection help! - PentaxForums.com

This is of interest with a comparison of 4 vintage lenses, including a novoflex. Now one of those would at least be a talking point!

http://forum.mflenses.com/best-affordable-500mm-mf-telephoto-t81673,highlight,%2Btelephoto.html
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 10-11-2020, 09:01 AM  
Contax/Yashica Adaptall mount adapter
Posted By marcusBMG
Replies: 4
Views: 286
That page is from a u/m from the 1980's (probably).

Those advertised listings prove the point - C/Y MM is out there. Not very common I think, I don't think I've come across one.
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 10-11-2020, 05:26 AM  
Contax/Yashica Adaptall mount adapter
Posted By marcusBMG
Replies: 4
Views: 286
There only seems to be the one C/Y adaptall mount.
Forum: Pentax SLR Lens Discussion 10-09-2020, 06:59 AM  
Tele converter for a Pentax K1 mk2.
Posted By marcusBMG
Replies: 20
Views: 1,064
I have played with several tc's on my 150-450mm see here.
Overall I can say that iq held up well with all of them, differences were slight (off the cuff the kenko was the best of the 3rd party ones, the 1.53x teleplus slightly the weakest) reflecting that it is the base lens that is the most important factor. But in practice I rarely use the a tc with this lens.
Forum: Flashes, Lighting, and Studio 10-01-2020, 11:49 AM  
Question about vivitar 285 zoom thyristor flash
Posted By marcusBMG
Replies: 15
Views: 567















You Tube



Forum: Lens Clubs 09-24-2020, 03:01 PM  
300mm plus Lens Club: discuss your long lenses
Posted By marcusBMG
Replies: 34,375
Views: 3,418,734
That's interesting Lowell, i should try the 107B without filter.
Forum: Lens Clubs 09-24-2020, 01:27 PM  
300mm plus Lens Club: discuss your long lenses
Posted By marcusBMG
Replies: 34,375
Views: 3,418,734
Thank you Jome. 107B and 360B are both fitted with the internal filter, 60B isn't (I thought it was but I was wrong!) Make of that what you will...
I am going to take some more pics with the 360B, bracketing focus.
Forum: Troubleshooting and Beginner Help 09-24-2020, 12:40 PM  
Macro Lenses.
Posted By marcusBMG
Replies: 20
Views: 1,184
Best value readily obtainable 1:2 macro IMO: tamron adaptall 90mm 52B/52BB. Manual focus of course but thats usually the mode with macro anyway. Excellent iq overall, some users note a bit of sensor reflection occasionally. Typically 60-90 (UK). Plus cost of a mount. Achieve 1:1 with the matching 18F extender, generic extension tubes, 3rd party close focus filter like raynox or the 01F 2x tc.

The only cheaper one is the also 1:2 cosina made 100mm f3.5, found as a cosina, vivitar, promaster etc. Advantage of this is it's already PKA mount, or KAF autofocus mount. Rattly plastic construction belies good performance. Often comes with matching 1:1 close focus filter. But IMO the tamron is better.
Forum: Lens Clubs 09-22-2020, 02:29 PM  
300mm plus Lens Club: discuss your long lenses
Posted By marcusBMG
Replies: 34,375
Views: 3,418,734
I've been checking up on the seal pup. DFA 150-450mm, KS2.

Look at me, already so much bigger and fatter!


Gi' us kiss maaa!




The male seals are ready to mate again as soon as the pup is born, but she's not having any of it.


Way to go, Ma!



That's made me hungry.
Forum: Lens Clubs 09-22-2020, 02:28 PM  
Post your HD PENTAX-D FA 150-450mm F4.5-5.6 ED DC AW pictures!
Posted By marcusBMG
Replies: 2,373
Views: 332,004
I've been photographing a newly born seal pup at local seal hangout Angel Bay - see more posts in adaptall lens club and 300mm lens club. KS2.



Other activity...


Forum: Pentax K-30 & K-50 09-22-2020, 06:42 AM  
k30 failure "repaired"?
Posted By marcusBMG
Replies: 3
Views: 637
ditto, I was using my KS-2 for a while, I reassigned the RAW/fx button to optical preview and pressing it a few times cleared the solenoid glitch. However longer term doing that can cause more significant problems with the aperture mechanisms. The fundamental solution is solenoid replacement which I did - it's not difficult.
Forum: Lens Clubs 09-22-2020, 04:36 AM  
300mm plus Lens Club: discuss your long lenses
Posted By marcusBMG
Replies: 34,375
Views: 3,418,734
Thank you for your interesting comments redpit.
I have experienced fringing with 60B (as the most used of these) at most f stops, but you're right, stopping down a bit is normally enough to minimise it, and lightroom does the rest.
With natural subjects like the castle tower, it can be a moot point whether you're seeing mainly a contrast difference or a resolution difference. Contrast is a strong point of the DFA 150-450mm. I now also have a set of close focus results from the same lenses, including a bit of test chart which highlights that. If people are keen I can present some crops, however the test didn't reveal anything different overall in the comparison.

You did notice the lower sets of "filmstrips" were with the 014F, right? I have previously tried the DFA with several 1.4x tc's (kenko, teleplus, tamron as well as the DFA 1.4x), all did pretty well, the main lesson for me was that if the lens is good, any decent tc will do ok. And that there is a bit of a mix-'n-match game to play with tc's. I did post some results here.
Forum: Lens Clubs 09-21-2020, 12:52 PM  
Adaptall Mount Club (Tamron).
Posted By marcusBMG
Replies: 4,075
Views: 713,657
X-post with 300mm lens club

This is my first comparison of the three 300mm f2.8's, and the 400mm f4, alone and with the 014F 1.4x teleconverter (a lens p0rn pic here ). The DFA 150-450mm provides a point of further comparison.
The 107B and 360B are in very good condition, the 400mm 65B is a bit more worn but optically pristine, my 60B is a bit of a beater, it was very worn when I acquired it about 5 yrs ago, and then I dropped it (it slid out of a Lowe slingshot pack when the zip undid) onto the mount end, subsequently I have not been able to use PKA mounts and the aperture ring is stiff and doesn't click.
My usual test subject - a turret on Conwy castle with good bright sunlight. I used my K3-ii, M mode and manual focus with all lenses using 10x live view, manfrotto 055Xprob tripod with Slik 800 (~45mm) ballhead (all the lenses have plates to balance them), remote shutter cable. Actually I found this set up to be a bit prone to vibration, I ended up pressing a finger against the side of the camera a lot to try to supress that, and I had to switch off SR. I didn't end up with any images obviously showing shake (and I upped the ASA to 200 and 400 rather than dip the shutter speeds below 1/320th) but it's a potential source of inconsistency/error.

Cropped section was also approx the point of focus.


300mm lenses alone. "Filmstrips" by f stop.






300mm's + 014F tc = 420mm, and 400mm 65B.





Observations.
First thing I can say is that these are all very good lenses. Second, the DFA 150-450mm stands tall against some heavyweight vintage competition. However both the 60B and the 65B yield little/nothing to the DFA at optimum F stops: f5.6, f8. The "beater" 60B is the surprise front runner of the 300's. 107B is a tad softer at wider apertures, improving as its stopped down and eventually catching up at around f8. My 360B is a slight disappointment, it's possible I have a slightly "off" copy, it is also possible that this is a lens where you're always chasing critical focus without ever being sure you've actually nailed it, it's that ticklish! The 400mm 65B is impressively consistent, definitely holds an edge over the 300's+tc, although the 60B+tc is very close. Comparing wide open 65B image resolution with the DFA (I am using a hazro 27" IPS screen these days, a big upgrade over my old one), the DFA edges it but its very close. F5.6 vs f5.6, still DFA by a short nose imo. At F8 I can't put one ahead of the other. The DFA also has no purple fringing of reflections off the lightning conductor.
65B also performed well with the 1.4x tc at 560mm.
Forum: Lens Clubs 09-21-2020, 12:40 PM  
300mm plus Lens Club: discuss your long lenses
Posted By marcusBMG
Replies: 34,375
Views: 3,418,734
This is my first comparison of the three 300mm f2.8's, and the 400mm f4, alone and with the 014F 1.4x teleconverter (a lens p0rn pic here ). The DFA 150-450mm provides a point of further comparison.
The 107B and 360B are in very good condition, the 400mm 65B is a bit more worn but optically pristine, my 60B is a bit of a beater, it was very worn when I acquired it about 5 yrs ago, and then I dropped it (it slid out of a Lowe slingshot pack when the zip undid) onto the mount end, subsequently I have not been able to use PKA mounts and the aperture ring is stiff and doesn't click.
My usual test subject - a turret on Conwy castle with good bright sunlight. I used my K3-ii, M mode and manual focus with all lenses using 10x live view, manfrotto 055Xprob tripod with Slik 800 (~45mm) ballhead (all the lenses have plates to balance them), remote shutter cable. Actually I found this set up to be a bit prone to vibration, I ended up pressing a finger against the side of the camera a lot to try to supress that, and I had to switch off SR. I didn't end up with any images obviously showing shake (and I upped the ASA to 200 and 400 rather than dip the shutter speeds below 1/320th) but it's a potential source of inconsistency/error.
Cropped section was also approx the point of focus. 300mm pic 1. 400mm pic 2.



300mm lenses alone. "Filmstrips" by f stop.






300mm's + 014F tc = 420mm, and 400mm 65B.





Observations.
First thing I can say is that these are all very good lenses. Second, the DFA 150-450mm stands tall against some heavyweight vintage competition. However both the 60B and the 65B yield little/nothing to the DFA at optimum F stops: f5.6, f8. The "beater" 60B is the surprise front runner of the 300's. 107B is a tad softer at wider apertures, improving as its stopped down and eventually catching up at around f8. My 360B is a slight disappointment, it's possible I have a slightly "off" copy, it is also possible that this is a lens where you're always chasing critical focus without ever being sure you've actually nailed it, it's that ticklish! The 400mm 65B is impressively consistent, definitely holds an edge over the 300's+tc, although the 60B+tc is very close. Comparing wide open 65B image resolution with the DFA (I am using a hazro 27" IPS screen these days, a big upgrade over my old one), the DFA edges it but its very close. F5.6 vs f5.6, still DFA by a short nose imo. At F8 I can't put one ahead of the other. The DFA also has no purple fringing of reflections off the lightning conductor.
65B also performed well with the 1.4x tc at 560mm.
Forum: Pentax Film SLR Discussion 09-20-2020, 02:59 PM  
Gear P0rn - post it if you got it.
Posted By marcusBMG
Replies: 7,143
Views: 909,033
droool.
clockwise from top: 400mm f4 65B; 300mm f2.8 360B; 300mm f2.8 60B; 300mm f2.8 107B. The latter is particularly uncommon.
Forum: Pentax SLR Lens Discussion 09-19-2020, 09:59 AM  
K Mount to EF Adapter?
Posted By marcusBMG
Replies: 12
Views: 631
exactly that's why the adapter works and gives infinity focus. There is ~1.5mm of leeway/space for the adapter. The other reason the EF mount is the most adaptable of the dslr mounts (apart from mirrorless) to other mounts is the large size of the lens opening.
Canon EF can be readily adapted to: PK, OM, C/Y, Nik F, M42 with cheap simple adapters. Shorter registration/flange distance mounts are more problematical: Konica, minolta MD. And the most difficult is: canon FD. Canon did the dirty on their users when they changed the mount, rendering their legacy FD lenses only usable with an optical adapter. And the design of the FD mount with the male bayonet on the camera means that the discrepancy is up to 5mm+ requiring a much more significant optical correction. Pretty much I haven't heard of any canon dslr user adapting and recommending FD glass* - mostly mirrorless users.
*alt: mount replacement eg check out the Lens Doctor
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