Site Sponsors
Results 1 to 10 of 10

Thread: D800E & Medium format lenses?

  1. #1
    Senior Member
    Join Date
    Mar 2011
    Location
    Beach Haven, NJ
    Posts
    685
    Post Thanks / Like

    D800E & Medium format lenses?

    Hi all:
    i use a Sony A900 with Minolta/Sony/Zeiss lenses. I also have an NEX7 that I use an adpter and full frame A900 lenses. Because of the smaller sensor, and laarger image circle of the full frame lenses, ther is a "crop factor" of 1.5. Here is my question: I also use a* Pentax 645D, and have several beautiful long lenses, such as the manual focus 150, 200, 300, and 1.4x ( matched for the 300 only). These lenses all have aaperature rings, and there is an adapter ring to attach these lenses to Nikon FF. Since the 645 lenses weere designed for a medium format image circle, i would assume there is also a crop factor when used on 35mm FF? What would that crop factor be?I preordered a D800E, and purchased a 14-24 Nikkor, and 18mm Zeiss ZF.2, but nothing on the long end which I only seldom use, so the inconvenience of an adapter would not be too big a deal.
    Thanks in advance
    Dave in NJ

  2. #2
    Super Duper
    Senior Member
    Shashin's Avatar
    Join Date
    May 2011
    Location
    Florida, USA
    Posts
    4,497
    Post Thanks / Like
    Images
    141

    Re: D800E & Medium format lenses?

    Dave, focal length is focal length. A 300mm 645 lens on a 35mm camera would be like a 300mm 35mm lens on the same camera. Crop factor is usually referenced to 35mm anyway.

  3. #3
    Super Duper
    Senior Member

    Join Date
    Mar 2009
    Posts
    3,672
    Post Thanks / Like

    Re: D800E & Medium format lenses?

    Dave,

    Good to hear from you. Just to add what Shashin posted....generally many medium format lenses by design didn't necessarily have the resolving power of their 35mm counterparts, so no telling how good lenses like the FA 300 f4 645 lens will be on a 35mm full frame sensor. It may not be as competitive as say the Nikon 300 f4 Af-S. It's definitely worth trying and often times performance may be surprising in the positive sense. If it isn't, the reasons may be fairly obvious.

    Please let us know your observations when the time comes. I'm sure we'll all be quite interested, especially for those like myself who use both Pentax MF and also Nikon. Thanks!

    Dave (D&A)

  4. #4
    Senior Member Stefan Steib's Avatar
    Join Date
    Mar 2010
    Location
    Lindenberg im Allgäu
    Posts
    1,294
    Post Thanks / Like
    Images
    12

    Re: D800E & Medium format lenses?

    Dave

    there is a nice little tool/App for the iPhone that I´m using permanently, for demos, for my own work and also for tuition as it is really simple and intuitive:

    It´s called "Angle of View" costs 2 $ and will enable you to compare the image angle (diagonal, vertical and horizontal) for up to 5 preset format buttons ( I use 4x5", IQ180, P45+,35mm Full format and APS-C.
    there is a little wheel on the right to chose the focal lenghts and also a slider that will tell you the distance to subject at which size you need for the given focal length.
    The diagonal image angle can then be compared and will tell you exactly how this chosen lens will do on which format . Very easy and very useful !

    Greetings from Germany
    Stefan
    because photography is more than technology - and " as we have done this all the time "
    facebook:hcam.de - www.hcam.de - www.hartblei.de

  5. #5
    Senior Member
    Join Date
    Mar 2011
    Location
    Beach Haven, NJ
    Posts
    685
    Post Thanks / Like

    Re: D800E & Medium format lenses?

    Stefan: I dnt have an iphone, but do have an ipad, so i will see if the app is available for it. Dave (D &A): nice to hear from you.
    dave in NJ

  6. #6
    Senior Member
    Join Date
    Mar 2011
    Location
    Beach Haven, NJ
    Posts
    685
    Post Thanks / Like

    Re: D800E & Medium format lenses?

    Re: D800E & Medium format lenses?
    Dave, focal length is focal length. A 300mm 645 lens on a 35mm camera would be like a 300mm 35mm lens on the same camera. Crop factor is usually referenced to 35mm anyway.
    I am connfused. Again. A 300 mm lens for 645 has a large image circle. cropping out only the center to 24x36 mm would be like using a longer lens, I thought. Same rational with FF used on APSC? Thanks again.
    Dave

  7. #7
    Super Duper
    Senior Member
    Shashin's Avatar
    Join Date
    May 2011
    Location
    Florida, USA
    Posts
    4,497
    Post Thanks / Like
    Images
    141

    Re: D800E & Medium format lenses?

    Dave, crop factor is always a reference of an angle of view to another particular format, usually 35mm.

    If you put a Nikon 300mm lens on your camera, it will have the same angle of view as your Pentax 645 300mm lens on the Nikon. Image circle will have no baring on the angle of view--that is just focal length and format size. If you put your Pentax A 35mm lens on the Nikon, it will have the same angle of view as a Nikon 35mm lens on the D800.

  8. #8
    Member
    Join Date
    Apr 2012
    Location
    Buenos Aires, Argentina
    Posts
    67
    Post Thanks / Like
    Images
    3

    Re: D800E & Medium format lenses?

    maybe it coudl help you: Rui Salgueiro's field-of-view calculator
    I think the answe you are looking for is something similar to 1,5

  9. #9
    Member
    Join Date
    Apr 2011
    Posts
    54
    Post Thanks / Like

    Re: D800E & Medium format lenses?

    Dave
    think of it as cropping the picture in post production
    the lens does not become any longer
    you are just cropping the center of the frame, if you then enlarge the cropped frame, it gives you the illusion that you used a longer lens

    if you use a 80mm on the 645, it "feels" almost like a 50mm on the FF or 35mm on the APS-C, thats what the crop factor is about

    I feel like it is a marketing technique to make smaller sensor looks like there is an advantage using longer lenses but in fact it doesnt
    they tell you that if you use a 4/3 system you double the focal length, so using a 400mm f2.8 on a 4/3 is a 800mm f2.8, which is a big lie
    using the 400mm f2.8 on the 4/3 is the same as using the 400mm f2.8 on the FF and then crop the center out, thats all

    so the lens does not get any longer and the DOV does not change


    Quote Originally Posted by gurtch View Post
    Re: D800E & Medium format lenses?
    Dave, focal length is focal length. A 300mm 645 lens on a 35mm camera would be like a 300mm 35mm lens on the same camera. Crop factor is usually referenced to 35mm anyway.
    I am connfused. Again. A 300 mm lens for 645 has a large image circle. cropping out only the center to 24x36 mm would be like using a longer lens, I thought. Same rational with FF used on APSC? Thanks again.
    Dave

  10. #10
    Senior Member
    Join Date
    Mar 2011
    Location
    las vegas
    Posts
    419
    Post Thanks / Like

    Re: D800E & Medium format lenses?

    i think perhaps the confusion is coming in that crop factor is relative to the sensor/film size, not the lens.

    using a 50mm lens as an example...

    on 8x10 it's extremely wide, on 645 it's a moderate wide, on 35mm it's a normal, and on 1.5x crop it's a mild telephoto. it's effect is only changed by what it's recording onto.

    it doesn't matter if the lens was constructed for large format or crop format. if you take a 50mm constructed for large format, medium format, FX digital, and DX digital, and strap them onto DX camera, you'll get essentially the same image.

    given the example of the 300mm and the large image circle...the image circle is only relevant in this instance if the format can utilize it. 300mm on 8x10 is a normal lens, whereas on crop digital it's a long telephoto.
    --David

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
  •