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Thread: Best 75mm / 90mm lens?......totally kidding, but not really...read on pls

  1. #91
    Corran's Avatar
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    Re: Best 75mm / 90mm lens?......totally kidding, but not really...read on pls

    Yes that is what I said Drew. I believe the confusion comes from the fact that most people have experience with 35mm (or 120) SLRs or modern DSLRs and there are not center filters for those lenses and they are all retrofocus designs, especially digital due to the issue of angle of incidence with respect to the sensor.
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  2. #92

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    Re: Best 75mm / 90mm lens?......totally kidding, but not really...read on pls

    My Superangulon XL 72mm (I shoot 5x7) was designed to have slight retrofocus to make it more manageable for focusing in normal view cameras.
    Best wishes --- Allen Anway

  3. #93

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    Re: Best 75mm / 90mm lens?......totally kidding, but not really...read on pls

    Consider the back focus distance and film format size -vs- lens angle of view.

    For a non-retrofocus view camera or similar lens with a large angel of view at the front light entrance of the lens, the exit angle of the lens is equally larger to project an image large enough to cover the sheet film area. The greater distance light is required to travel to the corners of the sheet of film relative to the center areas of that same sheet of film results in light fall off. To this is why a "center filter" has higher density in the center relative to the outside area of the center filter.

    Retrofocus wide angle lenses invented by Angénieux in the 1950's is essentially a reversed telescope to make a wide angle of view lens work with a camera film plane that has a smaller lens exit angle than lens entry angle. This was required to meet the fixed lens mount to lens exit distance in cinema cameras initially. It was soon applied to Single Lens Reflex camera lenses. By reducing the angle of light exiting the lens (mandated due to the fixed lens to film plane mounting of the camera) relative to the larger angle of light at the lens entry, light fall off is REDUCED but NOT eliminated. Example:
    https://patents.google.com/patent/US3037426A/en

    To achieve back focus compensation along with the optical requirements of a Retrofocus lens design, there are LOTs of optical elements involved as there is much light contortions that happen within the lens. This will have an effect on the image quality produced by the Retrofocus wide angle lens. The view camera wide angle optics is inherently simpler with the inherent trade off of light fall off due to it's optical design and how they are used, but there can be better image performance due to it's simpler optical design.

    There is no free lunch or ideal optical for all image making needs. All goes back to what they image making goals are.


    Bernice

  4. #94

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    Re: Best 75mm / 90mm lens?......totally kidding, but not really...read on pls

    Quote Originally Posted by Bernice Loui View Post
    Retrofocus wide angle lenses invented by Angénieux in the 1950's
    Another myth. TTH introduced this type of lens in 1931 for the 3 strip Technicolor process. Lenses occasionally surface on, e.g., ebay.com.

  5. #95

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    Re: Best 75mm / 90mm lens?......totally kidding, but not really...read on pls

    https://www.lensrentals.com/blog/201...-angle-lenses/

    Initial idea -vs- development into better performance optic.


    Bernice


    Quote Originally Posted by Dan Fromm View Post
    Another myth. TTH introduced this type of lens in 1931 for the 3 strip Technicolor process. Lenses occasionally surface on, e.g., ebay.com.

  6. #96
    Drew Wiley
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    Re: Best 75mm / 90mm lens?......totally kidding, but not really...read on pls

    I prefer to use an ordinary 125 Fujinon W (or NW) to something like a 120 Super Angulon for general use on 4x5, not only because it's a much lighter lens, but because there's way less falloff and corner "stretch" distortion. But forfeiting a huge image circle comes with the territory; so it's not a good choice for architectural interiors. There's never a single correct answer. Right tools for the right job.

  7. #97

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    Re: Best 75mm / 90mm lens?......totally kidding, but not really...read on pls

    Quote Originally Posted by Bernice Loui View Post
    https://www.lensrentals.com/blog/201...-angle-lenses/

    Initial idea -vs- development into better performance optic.


    Bernice
    Learn to read. He explicitly mentions TTH and says too that Angenieux used the TTH's idea to develop many more lenses. And he says nothing about Wide Angle Rectilinears or early w/a anastigmats such as the f/18 Protar Ser. V, the f/14 Perigraphe Ser. VIa and other w/a Dagor types including Goerz' (and later CZJ) own.

  8. #98

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    Re: Best 75mm / 90mm lens?......totally kidding, but not really...read on pls

    None of which are retro focus designs.

    Stop fighting Dan.


    Bernice

    Quote Originally Posted by Dan Fromm View Post
    And he says nothing about Wide Angle Rectilinears or early w/a anastigmats such as the f/18 Protar Ser. V, the f/14 Perigraphe Ser. VIa and other w/a Dagor types including Goerz' (and later CZJ) own.

  9. #99

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    Re: Best 75mm / 90mm lens?......totally kidding, but not really...read on pls

    Bernice, learn to read. The link you posted is headed

    The Development of Wide-Angle Lenses
    By Roger Cicala
    Published March 8, 2011

  10. #100
    Drew Bedo's Avatar
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    Re: Best 75mm / 90mm lens?......totally kidding, but not really...read on pls

    I have long felt that the "best" camera gear to shoot with is the gear currently in your kit: Go out and shoot with it!

    Now then; there are lenses designed and manufactured in recent years that are formulated to be as sharp as is optically possible with color correction as good as can be done using the materials available. computer design and really close and consistancy of quality control have never been better. If you want a reasonably fast tack sharp apo-chromatic lens brand new in the box . . .get out your high limit credit card in some elite color (Gold, Platinum, Sapphire, black etc)

    Will that be the "best " lens? Maybe not.
    Drew Bedo
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