Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
03-29-2022, 03:56 PM - 1 Like   #31
Site Supporter
Site Supporter
Digitalis's Avatar

Join Date: Mar 2009
Location: Melbourne, Victoria
Photos: Gallery
Posts: 11,694
QuoteOriginally posted by Zygonyx Quote
i am surprised you can take such a picture on Fuji Medium Format : has the file been cropped ?
Not my photo, I was using it for illustrative purposes. The image circle of this lens is 65mm which gives plenty of room for a medium format sensor, most Tilt/shift lenses designed for 35mm format can at least cover 645 format in a pinch.

03-29-2022, 05:10 PM   #32
Loyal Site Supporter
Loyal Site Supporter




Join Date: Jun 2014
Photos: Gallery
Posts: 206
Interesting move from Laowa; I've been pondering over the last few months whether they'd pull something out of their hat exactly like this. I would have suggested that Pentax see if they can license the lens, strip off the shift mechanism and turn it into an inexpensive fully manual wide-angle lens for the 645 system. The sharpness looks okay for the borders of the 44x33 sensor. Maybe the Pentax lens coatings would help the lens flare as well; although looking at the DPR Review video, the lens is marked as "Sample" and reading the Phillip Reeve review he makes the comment that the production lens should have further "blackening of the lens elements" to help with ghosting.

That all depends on where the rear element in the lens sits; it may not have the room to do so without entending into the mirror box too far. Would be nice for the 645Z/D users to get a wide angle option again.
03-29-2022, 09:42 PM   #33
Pentaxian




Join Date: Feb 2015
Photos: Gallery
Posts: 12,173
QuoteOriginally posted by Focusrite Quote
Would be nice for the 645Z/D users to get a wide angle option again.
isn't there some sort of mechanical adapter that would work to fit one of the Laowa 20 mount versions to P645 mount?
03-29-2022, 09:52 PM   #34
Pentaxian




Join Date: Feb 2015
Photos: Gallery
Posts: 12,173
Laowa 20 to Pentax 645, maybe not possible.
https://en.wikipedia.org/wiki/Flange_focal_distance

Pentax K = 45.46 mm

Nikon F = 46.50 mm

Canon EF = 44.00 mm

Fuji G = 26.50 mm

Pentax 645 flange distance = 70.86mm

---------- Post added 30-03-22 at 07:12 ----------

QuoteOriginally posted by house Quote
Doing it in post in an abysmal workflow that makes taking the right photo very difficult and unsatisfying.
https://architecture-photos.co.uk/shift-lens-importance/

03-30-2022, 04:26 AM   #35
Pentaxian
Zygonyx's Avatar

Join Date: Jun 2011
Location: Ile de France
Posts: 4,032
Yep, impossible on 645 mount.
04-13-2022, 06:31 AM   #36
Pentaxian
Class A's Avatar

Join Date: Aug 2008
Location: Wellington, New Zealand
Posts: 11,250
QuoteOriginally posted by Mistral75 Quote
An interesting addition to the Pentax K lens line-up, the Venus Optics Laowa 20mm f/4 Zero-D Shift was announced today:
I've added it to the list.
Please let me know if you happen to know whether I've missed any in between.
04-13-2022, 06:49 AM - 1 Like   #37
Pentaxian
Mistral75's Avatar

Join Date: Feb 2009
Location: Paris, France
Posts: 7,507
Original Poster
QuoteOriginally posted by Class A Quote
I've added it to the list.
Please let me know if you happen to know whether I've missed any in between.
  • HD Pentax-D FA 21mm f/2.4 ED Limited DC WR
  • HD Pentax-FA 31mm f/1.8 Limited, HD Pentax-FA 43mm f/1.9 Limited and HD Pentax-FA 77mm f/1.8 Limited replacing their other smc sisters (the three princesses, therefore female lenses )
  • Irix 21mm f/1.4 Dragonfly
  • Kenko 400mm f/8 N II S replacing the Kenko (not Kenko Tokina) 400mm f/8 N II
  • Meyer Optik Görlitz Trioplan 35mm f/2.8 II
  • Meyer Optik Görlitz Primoplan 58mm f/1.9 II
  • Meyer Optik Görlitz Primoplan 75mm f/1.9 II


04-13-2022, 10:10 AM   #38
Pentaxian
Class A's Avatar

Join Date: Aug 2008
Location: Wellington, New Zealand
Posts: 11,250
So nothing to add/change, really...



I've made the updates, thanks a lot!

Last edited by Class A; 04-13-2022 at 10:18 AM.
04-13-2022, 10:16 AM - 1 Like   #39
Pentaxian
Mistral75's Avatar

Join Date: Feb 2009
Location: Paris, France
Posts: 7,507
Original Poster
They do replace the earlier versions, which were sold by the former incarnation of Meyer Optik Görlitz (now liquidated and dissolved).
04-13-2022, 10:19 AM   #40
Pentaxian
Class A's Avatar

Join Date: Aug 2008
Location: Wellington, New Zealand
Posts: 11,250
QuoteOriginally posted by Mistral75 Quote
They do replace the earlier versions, which were sold by the former incarnation of Meyer Optik Görlitz (now liquidated and dissolved).
Thanks, I had realised that a minute ago and edited my previous post. Too slow.
07-29-2022, 06:22 AM - 5 Likes   #41
Loyal Site Supporter
Loyal Site Supporter
baro-nite's Avatar

Join Date: Aug 2011
Location: North Carolina, USA
Photos: Gallery | Albums
Posts: 5,294
Picked up a copy as soon as it was available. My first test was on my infrared-converted K-5, and the results were somewhat disappointing. Usable, but mushy edges and corners, especially when shifted. However it is quite sharp across the frame on my K-1. Hardly surprising that the designers were more concerned with the visible spectrum than infrared!



3-shot shift panorama, Laowa 20/4 Shift, 590nm IR-converted Pentax K-5



3-shot shift panorama, Laowa 20/4 Shift, Pentax K-1
07-29-2022, 07:42 AM   #42
Site Supporter
Site Supporter
Digitalis's Avatar

Join Date: Mar 2009
Location: Melbourne, Victoria
Photos: Gallery
Posts: 11,694
QuoteOriginally posted by baro-nite Quote
Hardly surprising that the designers were more concerned with the visible spectrum than infrared!
I'm not sure the DFA21 is significantly better - in my experiments with the R72 filter the DFA21 had a pretty strong hotspot when stopped down, wide open veiling flare was an issue.
07-29-2022, 11:03 AM   #43
Loyal Site Supporter
Loyal Site Supporter
baro-nite's Avatar

Join Date: Aug 2011
Location: North Carolina, USA
Photos: Gallery | Albums
Posts: 5,294
QuoteOriginally posted by Digitalis Quote
I'm not sure the DFA21 is significantly better - in my experiments with the R72 filter the DFA21 had a pretty strong hotspot when stopped down, wide open veiling flare was an issue.
Ah, well. I was going to get one or the other of these two lenses, in part for IR use. Still looking...
08-29-2022, 10:10 AM   #44
Junior Member




Join Date: Dec 2010
Location: St. Petersburg, FL.
Posts: 36
QuoteOriginally posted by Wheatridger Quote
Composition Adjustment is a helpful and unique Pentax advantage, but it's not nearly as powerful as a shift lens. I know, I've used both.
Have you used this Venus 20mm shift lens? I use the composition adjustment all of the time for my Architecture work, but sometimes it's not enough.
08-29-2022, 07:29 PM   #45
Site Supporter
Site Supporter




Join Date: Dec 2010
Location: Colorado Front Range
Photos: Gallery | Albums
Posts: 644
This one's going back... (Laowa Venus 15mm shift)

Maybe I got a bad copy- but in three sessions with the Laowa 15mm shift lens I just purchased, I have yet to get a critically sharp photo. Even without shifting, even at f8. I obtained focus confirmation via OVF mode, but couldn't get that to work with Live View. I even tried bracketing focus slightly around the infinity mark. Nothing looked sharp at 200%, and many images were noticeably unsharp without any enlargement. "But wait," you say, "didn't you calibrate the focus with your camera?" Yes, I tried, but the only option my camera gave me was to make a global adjustment for all lenses. You wouldn't want to do that, because it would degrade the performance of all other lenses.

The problem is that because the lens has no electrical contacts, the camera won't recognize it. Just like it doesn't know the which f-stop is set, so no mode of metering works, not even M and AV. Should I buy a light meter? That won't fix the other problem, which is terrible ghosting when the sun hits the hemispherical front element.

I haven't tried the Laowa 20mm shift, but I probably won't try based on this 15mm.

If anyone else sees my mistakes better than I do, please correct me. I'd like to do a more detailed review later on, comparing this with the other shift options I've found. Working as a real estate/architectural photographer, that capability is valuable to me. Tipping off my ultimate verdict, I'm finding the best solution is an IRIX 11mm lens with Composition Adjustment, plus a finishing touch in Lightroom.

Last edited by Wheatridger; 08-29-2022 at 09:20 PM. Reason: misidentified lens
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
20mm, f/4, laowa, laowa 20mm f/4, mm, nikon, pentax, pentax news, pentax rumors, pm, post, shift, venus optics laowa, zero-d
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
New Forum Member Question: Venus Optics Laowa 100mm F2.8 2:1 Ultra Macro APO mdcall Pentax SLR Lens Discussion 5 10-07-2021 07:05 PM
Macro Thomas Shahan - Macro Photo Critique presented by Laowa by Venus Optics honeybee Photo Critique 6 05-14-2021 02:59 AM
Venus Laowa 15mm Zero-D shift PK i_trax Pentax SLR Lens Discussion 16 05-07-2021 05:39 AM
Venus Optics Laowa 15mm f/4.5 Zero-D Shift Mistral75 Pentax News and Rumors 95 05-02-2021 11:39 PM
Laowa 15mm F4.5 Zero-D Shift not in K mount house Photographic Industry and Professionals 11 11-03-2020 08:49 PM



All times are GMT -7. The time now is 07:29 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top