Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
06-01-2021, 09:01 PM   #46
Pentaxian




Join Date: Jan 2011
Location: New York
Posts: 4,772
Isn't that lens designed for an APS-C size sensor? The thread title is asking for full-frame and I think a 17-50 will have severe vignetting.

06-01-2021, 09:09 PM   #47
Pentaxian




Join Date: Mar 2013
Location: Washington State
Posts: 586
QuoteOriginally posted by DeadJohn Quote
Isn't that lens designed for an APS-C size sensor? The thread title is asking for full-frame and I think a 17-50 will have severe vignetting.
Oops. My bad. Sorry about that.
06-01-2021, 11:55 PM   #48
Pentaxian
madbrain's Avatar

Join Date: May 2008
Location: San Jose, CA
Posts: 1,341
Original Poster
QuoteOriginally posted by Tesla Quote
Oops. My bad. Sorry about that.
No problem. I wouldn't buy it without researching it :-)

So far, I have come up empty on my quest.

I got an APS-C ultrawide lens for now, Sigma 10-20 f3.5 .

Full gory tests in FF mode in these posts below :

A test of 4 ultrawides on a K-1 - Page 2 - PentaxForums.com
A test of 4 ultrawides on a K-1 - Page 2 - PentaxForums.com

Conclusion : it's not really usable in FF mode except at 20mm wide open. Or with a TC at 12mm (about 17mm effective).

I guess this lens, with an 82mm filter set, will have to do for my next trip to Paris - I leave on Sunday. But I'll keep looking for something really full-frame that can do better.
Still haven't decided on all the lenses I'll take with me, but that one is definitely on the list.
06-02-2021, 06:47 AM   #49
Loyal Site Supporter
Loyal Site Supporter
UncleVanya's Avatar

Join Date: Jul 2014
Photos: Gallery | Albums
Posts: 21,546
QuoteOriginally posted by madbrain Quote
I guess this lens, with an 82mm filter set, will have to do for my next trip to Paris - I leave on Sunday. But I'll keep looking for something really full-frame that can do better.
Still haven't decided on all the lenses I'll take with me, but that one is definitely on the list.
My last trip to Paris was five years ago. I took the tiny Panasonic LX-7. That camera has an equivalent zoom range of roughly 20-105 if you include the sensor aspect ratio adjustments. I do not recall many times that I wanted to go wider, so the 10-20mm (@20mm) you are taking may not limit your images at all. The 105 end was more limiting, but only in a few specific shots. Obviously the tiny sensor and zoom arenít going to rival the results you should be able to get, but the angles of view needed due to the architecture and such may translate.

06-04-2021, 08:43 PM   #50
Pentaxian
madbrain's Avatar

Join Date: May 2008
Location: San Jose, CA
Posts: 1,341
Original Poster
QuoteOriginally posted by UncleVanya Quote
My last trip to Paris was five years ago. I took the tiny Panasonic LX-7. That camera has an equivalent zoom range of roughly 20-105 if you include the sensor aspect ratio adjustments. I do not recall many times that I wanted to go wider, so the 10-20mm (@20mm) you are taking may not limit your images at all. The 105 end was more limiting, but only in a few specific shots. Obviously the tiny sensor and zoom arenít going to rival the results you should be able to get, but the angles of view needed due to the architecture and such may translate.
My widest lens on Pentax excluding the Sigma 10-20 APS-C is the D FA 28-105 FF. 28 can be too long indoors, and sometimes also outdoors when very close to architectural milestones or on tiny streets.

20-105 would be a lot better than 28-105, but I don't know of such a lens for full-frame Pentax. Do you ?

On my Lumix GX85 the widest lens is the 12-32 which is 24-64 equivalent FOV.
06-05-2021, 06:16 AM   #51
Loyal Site Supporter
Loyal Site Supporter
UncleVanya's Avatar

Join Date: Jul 2014
Photos: Gallery | Albums
Posts: 21,546
QuoteOriginally posted by madbrain Quote
My widest lens on Pentax excluding the Sigma 10-20 APS-C is the D FA 28-105 FF. 28 can be too long indoors, and sometimes also outdoors when very close to architectural milestones or on tiny streets.

20-105 would be a lot better than 28-105, but I don't know of such a lens for full-frame Pentax. Do you ?

On my Lumix GX85 the widest lens is the 12-32 which is 24-64 equivalent FOV.
Iím not aware of any Full Frame system with a 20-105. Sony has a 24-105 which I own. By all accounts thereís a lot of computational wizardry involved to correct that lens. It does a good job nevertheless but it highlights the complexity of even a 24-105 let alone a 20-105. Even the little lx-7 only has a 24-90 range if you stick to the same aspect ratio on the sensor. The sensor aspect ratio can extend coverage to be wider or narrower in a way that mimics 20 at the wide end and 105 at the long end. Itís a useful trick but nothing more. 20-105 is just over a 5x zoom range but the extreme wide angle seems like it would be a challenge to put into a normal to telephoto without making the lens huge.
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!
15mm, 18-35mm, af full-frame ultrawide, amateur, apertures, aps-c, fa, ff, fisheye, front elements, full-frame ultrawide lens, hsm, images, irix, k-mount, lens, lenses, lot, pentax lens, pics, purposes, slr lens, sony a7rii, space, test, thread, vignette
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Some questions about buying sony full frame + adapters + pentax full frame lens jhlxxx Pentax Full Frame 8 06-14-2017 05:13 PM
From Full-Frame Sony... to Pentax... to Full-Frame Canon Mr_Canuck Non-Pentax: Canon, Nikon, Sony, etc. 42 01-21-2014 12:50 AM
Full frame or no full frame.... Deedee Pentax K-3 & K-3 II 14 10-08-2013 05:39 AM
For Sale - Sold: Sigma Full Frame 12-24mm f4.5-5.6 ultrawide lens (Worldwide) DanielT74 Sold Items 11 09-14-2011 09:48 PM
Full Frame Full Frame vanchaz2002 Pentax DSLR Discussion 30 12-11-2008 07:09 AM



All times are GMT -7. The time now is 10:07 PM. | 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