Site Sponsors
Results 1 to 10 of 10

Thread: Sony A7 vs Lens Turbo (Speed booster")

  1. #1
    Senior Member Rawfa's Avatar
    Join Date
    Nov 2008
    Location
    Rio de Janeiro
    Posts
    2,393
    Post Thanks / Like

    Sony A7 vs Lens Turbo (Speed booster")

    These are not scientific tests at all (neither are they fair, because the lens turbo is not as wide and because we are comparing a cropped sensor to a full frame one) but I thought I'd just throw them out there for the sake of it.

    What I did was simply to take my Sony A7, place it on a tripod, set all settings the same and test my Pentax 28mm f2.8, 50mm 1.4 and 85mm f2.0 with the Lens Turbo in APS-C mode (the generic speed booster) and with a regular Pentax PK adapter in full frame mode. All shots were taken wide open and I connected the camera to a 32inch HDTV to focus (I used the camera's full magnification assist). It really surprised me that the A7 was not able to achieve full focus and the lens turbo was. The corners are bad in both cases as is the overall IQ with THESE PARTICULAR LENSES wide open.

    Sony A7 with regular Pentax PK adapter and 28mm f2.8

    Full resolution http://farm3.staticflickr.com/2852/1...ded90341_o.jpg

    Sony A7 with lens turbo and 28mm f2.8

    Full resolution
    http://farm8.staticflickr.com/7302/1...fa33bd3a_o.jpg

    Sony A7 with regular Pentax PK adapter and 50mm f1.4

    Full Resolution
    http://farm4.staticflickr.com/3730/1...397f1deb_o.jpg

    Sony A7 with lens turbo and 50mm f1.4

    Full Resolution http://farm8.staticflickr.com/7304/1...118befc8_o.jpg

    Sony A7 with regular Pentax PK adapter and 85mm f2.0

    Full Resolution http://farm8.staticflickr.com/7325/1...2f8254bd_o.jpg

    Sony A7 with lens turbo and 85mm f2.0

    Full resolution http://farm8.staticflickr.com/7458/1...02534eb4_o.jpg

  2. #2
    Senior Member
    Join Date
    Jul 2010
    Posts
    495
    Post Thanks / Like

    Re: Sony A7 vs Lens Turbo (Speed booster")

    What's your conclusion about the centers?

  3. #3
    Senior Member
    Join Date
    Oct 2010
    Location
    Germany
    Posts
    541
    Post Thanks / Like

    Re: Sony A7 vs Lens Turbo (Speed booster")

    Hi Rafael,

    Thanks for the comparison.

    I'd be much more interested in an A7 VS a Nex (insert number here) + Lens turbo comparison tho.

    Do you have a Nex on hand to do this?
    I'm thinking of either an A7, or a NEX6 (7, a6000...) with such an adapter.

    Best
    Oliver
    My Flickr

  4. #4
    Senior Member
    Join Date
    Apr 2008
    Posts
    1,446
    Post Thanks / Like

    Re: Sony A7 vs Lens Turbo (Speed booster")

    yes and better yet why not try it with the Metabones speed booster rather a generic lens turbo adapter.

  5. #5
    Senior Member
    Join Date
    Oct 2010
    Location
    Germany
    Posts
    541
    Post Thanks / Like

    Re: Sony A7 vs Lens Turbo (Speed booster")

    Quote Originally Posted by mazor View Post
    yes and better yet why not try it with the Metabones speed booster rather a generic lens turbo adapter.
    Cough, cough, price?!

    But yes, comparing the Nex VS A7 (used) prices, a MB Speebooster would put them in the same ball park.
    My Flickr

  6. #6
    New Member
    Join Date
    Apr 2013
    Posts
    14
    Post Thanks / Like

    Re: Sony A7 vs Lens Turbo (Speed booster")

    Quote Originally Posted by OlliL View Post
    Cough, cough, price?!

    But yes, comparing the Nex VS A7 (used) prices, a MB Speebooster would put them in the same ball park.
    I have a NEX 5R and MB Speedbooster and A7R

    I have to say there is no comparison between the two, in every single way the A7R outshines the 5R + SB, with the same lenses. There is less of a difference at low ISO but at high ISO A7R is better, EVEN taking into account the extra stop of light that the speedbooster gives the 5R.

    Speedbooster on the A7R in crop mode is kind of a good middle ground, useful for lowlight situations where I don't need the full 36mp but want the extra stop of light the speedbooster gives. Still better than the 5R noise wise.

    Maybe a closer comparison would be the NEX-7 vs A7R

    Theres a good blog here Photototo that explores this comparison.

  7. #7
    Super Duper
    Senior Member

    Join Date
    May 2008
    Location
    Manchester/Jerusalem
    Posts
    2,652
    Post Thanks / Like
    Images
    290

    Re: Sony A7 vs Lens Turbo (Speed booster")

    Which versions of Pentax lenses? I have the SMC Takumar 28mm, Super Takumar 35mm and 50mm 1.4 and the Pentax M 85mm f2. I just bought a Pentax M 24mm f2.8 yesterday. I have the novoflex adaptor for all. On the A7r the 28mm and 35mm have corners you would imagine, typical for lenses of the age, the 50mm was incredible at f8, corner to corner and the 85mm is a very sharp lens stopped down but I haven't tested corners on what I use as a portrait lens. I've bought the 24mm as a fun and cheap stop gap solution as I work out whether to buy the Zeiss 21mm, the Nikon 14-24 or wait for the sony E mount wide angle solution. I need a really good wide angle solution for commercial work.
    Last edited by Ben Rubinstein; 19th February 2014 at 06:59.
    I am not a painter, nor an artist. Therefore I can see straight, and that may be my undoing. - Alfred Stieglitz

    Website: http://www.timelessjewishart.com

  8. #8
    Senior Member Rawfa's Avatar
    Join Date
    Nov 2008
    Location
    Rio de Janeiro
    Posts
    2,393
    Post Thanks / Like

    Re: Sony A7 vs Lens Turbo (Speed booster")

    Metabones doesnīt have Pentax PK Speedbooster yet.
    I donīt have any APS-C NEX camera to test with the lens turbo against the A7.
    The 28mm and the 50mm are SMC. The 35mm and 85mm are some offbrand lenses. I have a 35mm f2.0 that is almost perfect though (with the exception of some very very sublte vingeting).
    Anyway, as much as I like Pentax Iīve started using Canon FDs, which are bigger and Iīve been getting great results.

  9. #9
    Senior Member
    Join Date
    Apr 2008
    Posts
    1,446
    Post Thanks / Like

    Re: Sony A7 vs Lens Turbo (Speed booster")

    Quote Originally Posted by Rawfa View Post
    Metabones doesnīt have Pentax PK Speedbooster yet.
    I donīt have any APS-C NEX camera to test with the lens turbo against the A7.
    The 28mm and the 50mm are SMC. The 35mm and 85mm are some offbrand lenses. I have a 35mm f2.0 that is almost perfect though (with the exception of some very very sublte vingeting).
    Anyway, as much as I like Pentax Iīve started using Canon FDs, which are bigger and Iīve been getting great results.
    I think the best Metabones speed booster to get would be the EF- emount and then carefully add dumb non electronic adapters on top. So to get Pentax PK onto speedbooster, one just needs a pentax K to EF adapter and mount that onto the EF- e mount speed booster.

  10. #10
    New Member
    Join Date
    Apr 2013
    Posts
    14
    Post Thanks / Like

    Re: Sony A7 vs Lens Turbo (Speed booster")

    Quote Originally Posted by mazor View Post
    I think the best Metabones speed booster to get would be the EF- emount and then carefully add dumb non electronic adapters on top. So to get Pentax PK onto speedbooster, one just needs a pentax K to EF adapter and mount that onto the EF- e mount speed booster.
    Yes the Metabones EF Speedbooster is easily adaptable I have OM, PK C/Y and Nikkor lenses that adapt well with just a metal "ring" adapter and they are cheap (5 USD) and plentiful because on the amount of Canon systems around.

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •