Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
03-05-2019, 10:58 PM   #1
Senior Member




Join Date: Jun 2013
Photos: Albums
Posts: 160
No Spin wanted , rotating front elements!

Hi all,
I'm looking for lenses that don't rotate the front element to focus.

Most primes do not rotate, pk and pka lenses mostly don't , most af zooms do

Good in terms of the front element not rotating for focus:

Pentax F 1.7 50mm doesnt

bad front element rotates:

PentaxF 70-210 does
Sigma 70-300 does


I'm not looking for IQ that can be searched for i just want to find which lenses do not rotate the front element and preferably auto focus

03-05-2019, 11:16 PM   #2
Administrator
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 48,154
I thought we had this info in the database, but perhaps it's been deleted as we transitioned over to the more standardized data format. Will add it back for lenses which are confirmed to have it.


Most if not all DA and D FA lenses don't have rotating front elements. With the exception of the FA* 28-70mm, which I believe does rotate, I think this aspect is mostly limited to cheaper F/FA lenses.

Adam
PentaxForums.com Webmaster (Site Usage Guide | Site Help | My Photography)



PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

03-06-2019, 01:28 AM   #3
Senior Member




Join Date: Jun 2013
Photos: Albums
Posts: 160
Original Poster
QuoteOriginally posted by Adam Quote
I thought we had this info in the database, but perhaps it's been deleted as we transitioned over to the more standardized data format. Will add it back for lenses which are confirmed to have it.


Most if not all DA and D FA lenses don't have rotating front elements. With the exception of the FA* 28-70mm, which I believe does rotate, I think this aspect is mostly limited to cheaper F/FA lenses.
I couldn't find it , there are lens which say internal focusing, but not specifically if the filter ring rotates. I'm playing around with an anamorphic lens so orientation matters as well as cpl and gnd filters. The results with the anamorphic have been surprising. For 50mm it pretty much works wider is useless, lot of light loss (1/160th f2.8 iso 1600 in daylight!
03-06-2019, 07:28 PM   #4
Pentaxian
jddwoods's Avatar

Join Date: Nov 2012
Location: Newark, Delaware
Posts: 882
QuoteOriginally posted by blackest Quote
Hi all,
I'm looking for lenses that don't rotate the front element to focus.

Most primes do not rotate, pk and pka lenses mostly don't , most af zooms do

Good in terms of the front element not rotating for focus:

Pentax F 1.7 50mm doesnt

bad front element rotates:

PentaxF 70-210 does
Sigma 70-300 does


I'm not looking for IQ that can be searched for i just want to find which lenses do not rotate the front element and preferably auto focus
I have or had the following:
zooms: F 35-70, DA 18-55, DA 17-70, DA 16-85, DA 55-300 SMC, DA 55-300 PLM, of these only the F 35-70 has a rotating front element.
primes: F 28, FA 50, all DA Limiteds, DFA 100 Macro WR, DA* 200 and 300, none of these have a rotating front element.
I think it is safe to say that none of the current FA, DA and DFA lenses currently in production have rotating front elements. Many of the current DA zooms are also internal focus so the inner element doesn't move in and out as well doesn't rotate while focusing but will extend when zooming out.

03-07-2019, 09:42 AM   #5
Senior Member




Join Date: Jun 2013
Photos: Albums
Posts: 160
Original Poster
QuoteOriginally posted by jddwoods Quote
I have or had the following:
zooms: F 35-70, DA 18-55, DA 17-70, DA 16-85, DA 55-300 SMC, DA 55-300 PLM, of these only the F 35-70 has a rotating front element.
primes: F 28, FA 50, all DA Limiteds, DFA 100 Macro WR, DA* 200 and 300, none of these have a rotating front element.
I think it is safe to say that none of the current FA, DA and DFA lenses currently in production have rotating front elements. Many of the current DA zooms are also internal focus so the inner element doesn't move in and out as well doesn't rotate while focusing but will extend when zooming out.
Thanks john,

it seems like its a problem with film era Pentax Zoom Lenses having a rotating front element, which is a pity.

there is the tamron 28-200 which seems to be soft with cr and purple fringing, will find out next week, when it arrives
03-07-2019, 01:37 PM   #6
Senior Member




Join Date: Feb 2012
Posts: 179
The FA24-90 doesn't rotate it's front lens, and that could well be considered a "film-era" zoom lens, as it still has an aperture ring.


The FA100-300, the A28-80 and the A35-70 as well are "rotators".
03-08-2019, 12:36 PM   #7
Site Supporter
Site Supporter
W412ren's Avatar

Join Date: Jul 2011
Location: Hampshire
Posts: 277
The FA J 18-35 doesn't rotate the front element either.
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!
dslr, element, focus, front, full frame, full-frame, k-1, k1, lenses, non-rotating filter ring, pentax k-1
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
135mm f/2.5 ---> 5 elements Super Takumar vs. 6 elements Pentax K Cabessius Pentax SLR Lens Discussion 3 11-29-2018 08:18 PM
The world is rotating, while trees watch blues_hawk Monthly Photo Contests 9 09-09-2018 04:12 PM
Manual focus K (or KA) zoom lenses with non-rotating front elements? ChrisR Pentax SLR Lens Discussion 13 04-05-2018 08:05 AM
Rotating front lenses tennjed Pentax SLR Lens Discussion 17 03-02-2015 11:33 AM
Rotating front element DUH! dws1117 Pentax SLR Lens Discussion 9 04-28-2008 05:13 PM



All times are GMT -7. The time now is 10:28 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