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Thread: Plasticca 450mm F3.5 dimensions

  1. #1

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    Dec 2019
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    Plasticca 450mm F3.5 dimensions

    Iíve recently acquired the Plasticca 450mm F3.5 version.
    i was surprised the lens size isnít large enough considering itís focal length and f-number.
    Do any of you guys have either 450mm F3.5 or F4 verisons and check the dimensions?

    I thought the size should rather be 450mm/3.5=128.5mm but the actual lens diameter is about 96mm and there is a black inner rim as shown in the second picture, whose hole diameter is 87.7mm. these numbers show the f-numbers are 4.6 and 5.1 each.

    How about is yours?

    I saw a related thread of Stevenís here.
    https://www.largeformatphotography.i...ight=Plasticca

    Thanks for your help.

    Click image for larger version. 

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    Click image for larger version. 

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  2. #2

    Join Date
    Aug 2018
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    261

    Re: Plasticca 450mm F3.5 dimensions

    It would be fun if you could show comparative shot of this besides those from a Canon 500D +2 diopter. I don't have bigger than 77mm -that would be opening of ca 75mm and aperture around f6.6

    When trying to decide on the actual max opening you could take a picture with a camera and compare with lens you know the aperture of.

    Annoying as a "wrong" aperture is, it is what you got and use it.

    Sent fra min SM-G975F via Tapatalk

  3. #3

    Join Date
    Aug 2000
    Location
    California
    Posts
    3,668

    Re: Plasticca 450mm F3.5 dimensions

    Quote Originally Posted by mhayashi View Post
    I’ve recently acquired the Plasticca 450mm F3.5 version.
    i was surprised the lens size isn’t large enough considering it’s focal length and f-number.
    Do any of you guys have either 450mm F3.5 or F4 verisons and check the dimensions?

    I thought the size should rather be 450mm/3.5=128.5mm but the actual lens diameter is about 96mm and there is a black inner rim as shown in the second picture, whose hole diameter is 87.7mm. these numbers show the f-numbers are 4.6 and 5.1 each.

    How about is yours?

    I saw a related thread of Steven’s here.
    https://www.largeformatphotography.i...ight=Plasticca

    Thanks for your help.

    Click image for larger version. 

Name:	17D29945-227C-4BBA-AC02-479635A0E4E5.jpg 
Views:	29 
Size:	98.4 KB 
ID:	219097
    Click image for larger version. 

Name:	F2CDECA1-51AE-4D5E-B2EF-28EE7F537C91.jpg 
Views:	30 
Size:	94.1 KB 
ID:	219098
    The focal length is crucial in determining aperture.

  4. #4

    Join Date
    Aug 2000
    Location
    California
    Posts
    3,668

    Re: Plasticca 450mm F3.5 dimensions

    Quote Originally Posted by mhayashi View Post
    Iíve recently acquired the Plasticca 450mm F3.5 version.
    i was surprised the lens size isnít large enough considering itís focal length and f-number.
    Do any of you guys have either 450mm F3.5 or F4 verisons and check the dimensions?

    I thought the size should rather be 450mm/3.5=128.5mm but the actual lens diameter is about 96mm and there is a black inner rim as shown in the second picture, whose hole diameter is 87.7mm. these numbers show the f-numbers are 4.6 and 5.1 each.

    How about is yours?

    I saw a related thread of Stevenís here.
    https://www.largeformatphotography.i...ight=Plasticca

    Thanks for your help.

    Click image for larger version. 

Name:	17D29945-227C-4BBA-AC02-479635A0E4E5.jpg 
Views:	29 
Size:	98.4 KB 
ID:	219097
    Click image for larger version. 

Name:	F2CDECA1-51AE-4D5E-B2EF-28EE7F537C91.jpg 
Views:	30 
Size:	94.1 KB 
ID:	219098
    The focal length is crucial in determining aperture.

  5. #5

    Join Date
    Dec 2019
    Location
    Tokyo, Japan
    Posts
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    Re: Plasticca 450mm F3.5 dimensions

    Thanks Jim and Oslolens for your inputs.
    I will try focusing and compare with another lens after I make the custom flange for this lens.

  6. #6

    Join Date
    Jan 2009
    Location
    Denmark
    Posts
    6,103

    Re: Plasticca 450mm F3.5 dimensions

    Just for the sake of comparison, here are the corresponding data for the tiny 200mm Plasticca!

    Focal length 200cm.
    Max aperture 40mm /F4.5 (engraved)

    Realistic max. Aperture is F5 - and, of course, there is the built-in pale yellow filter as the rear cell!
    Obviously, the engraved aperture is very optimistic!

  7. #7

    Join Date
    Dec 2019
    Location
    Tokyo, Japan
    Posts
    110

    Re: Plasticca 450mm F3.5 dimensions

    Thank you Steven for your measurements. I am relieved to hear it….

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