Thread: new Sigma lenses announced! (including 85mm ART)

Page 4 of 4 FirstFirst ... 234
Results 31 to 38 of 38
  1. #31  
    Senior Member Frank Glencairn's Avatar
    Join Date
    Apr 2012
    Location
    Germany
    Posts
    4,028
    Parafocal is nice to have, but it's pretty low on my personal list, since I never zoom while rolling.
    No breathing, or no telescoping though, is something I can use every day.
    Reply With Quote  
     

  2. #32  
    Senior Member Liam's Avatar
    Join Date
    Jul 2012
    Location
    Melbourne, Australia
    Posts
    472
    Quote Originally Posted by Taikonaut View Post
    My 18-35 is parfocal. Even had a member here attacking me because his was not I guess some are not parfocal so rather than being force to do a recall Sigma simply say parfocal was not intentional. So does that means those with parfocal zooms have faulty lens and should send them back to Sigma? Doubt it.
    My semi-parfocal 18-35 will only do so at F4 and above, strange.
    Reply With Quote  
     

  3. #33  
    Senior Member Zak Forsman's Avatar
    Join Date
    Apr 2012
    Location
    Los Angeles, CA
    Posts
    622
    Quote Originally Posted by Liam View Post
    My semi-parfocal 18-35 will only do so at F4 and above, strange.
    Was able to get my 18-35 to be perfectly parfocal after about ten minutes of adjusting my speedbooster's rear optical element.
    DOWN AND DANGEROUS :: A smuggler bleeds like anyone else. He just gets more chances to prove it.
    THE SABI COMPANY :: FACEBOOK :: TWITTER :: IMDB :: VIMEO
    Reply With Quote  
     

  4. #34  
    Senior Member
    Join Date
    Mar 2015
    Location
    USA N. CA
    Posts
    3,202
    Right Zack, the key to a good zoom being parfocal is having the back focus/FFD set correctly. Even a $30K Cine zoom will not be parfocal, if this is not set correctly. The Speed Booster made a nice adjustsble lens mount, to get the FFD dialed in.
    Cheers
    Reply With Quote  
     

  5. #35  
    Senior Member DPStewart's Avatar
    Join Date
    Feb 2015
    Location
    The Puget Sound
    Posts
    3,679
    Quote Originally Posted by Zak Forsman View Post
    Was able to get my 18-35 to be perfectly parfocal after about ten minutes of adjusting my speedbooster's rear optical element.
    Zak, you're so powerful. You can come over and adjust my rear optical element anytime. You stud.
    Cameras: Blackmagic Cinema Camera, Blackmagic Pocket Camera (x2), Panasonic GH2 (x2), Sony RX100 ii, Canon 6D, Canon T2i,
    Mics: Sennheiser, AKG, Shure, Sanken, Audio-Technica, Audix
    Lights: Every Chinese clone you can imagine
    Reply With Quote  
     

  6. #36  
    Senior Member
    Join Date
    Sep 2013
    Location
    Maryland
    Posts
    478
    Quote Originally Posted by LochnessDigital View Post
    For the GL Optics 18-35:
    "3500 USD for 120 degrees focus rotation and 4350 USD for 300 degrees focus rotation"

    And for the GL Optics 50-100:
    "FOB Price: 3850 USD for 120 degrees focus rotation and 4850 USD for 260 degrees focus rotation"

    If you already have the lens it's minus 800 dollars, to do the conversion.
    Reply With Quote  
     

  7. #37  
    Senior Member Taikonaut's Avatar
    Join Date
    May 2012
    Posts
    3,159
    Quote Originally Posted by Zak Forsman View Post
    Was able to get my 18-35 to be perfectly parfocal after about ten minutes of adjusting my speedbooster's rear optical element.
    Mine parfocal on my EF mount BMPC 4k and Mini 4.6k, and also parfocal on the Pocket with metabone SB after adjustment.
    Reply With Quote  
     

  8. #38  
    Senior Member
    Join Date
    Mar 2015
    Location
    USA N. CA
    Posts
    3,202
    Well, there is some good QC on the BM EF lens mounts. My Angie Cine zoom was parfocal (correct ffd on lens mount) on the Pocket MFT mount camera with a WC PL adapter, but when I,moved it to the Micro Cinema MFT mount, the Micro FFD on the MFT mount was off enough, so,lens was no longer parfocal when zooming. I had to reshim the PL adapter to get correct FFD back.
    Cheers
    Reply With Quote  
     

Similar Threads

  1. FS: Rokinon Cine lenses (24, 35, 50, 85mm)
    By voyagervideo in forum For Sale / Want to Buy
    Replies: 5
    Last Post: 09-12-2016, 09:08 AM
  2. Replies: 13
    Last Post: 01-10-2016, 04:10 PM
  3. Sigma 24mm f1.4 Art Lens Announced
    By innerspark in forum Lens Discussion
    Replies: 16
    Last Post: 02-12-2015, 02:03 PM
  4. Sigma ART Rumors - 85mm, 24mm, 24-70f2, 16-20nn
    By innerspark in forum Lens Discussion
    Replies: 1
    Last Post: 07-16-2014, 08:07 AM
  5. Kowa Micro 4/3 lenses cine lenses Announced!
    By cplkao in forum Lens Discussion
    Replies: 6
    Last Post: 11-14-2013, 06:53 PM
Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •