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Image Enlargement with Wide Angle Lens

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  • Janice Glesser
    replied
    Click image for larger version

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    David thanks for the suggestion. It needs to have vertical adjustment so something like this might work depending on if it will raise high enough to go under the lens.

    Not sure if I want to go this route since the lens case seems to work and I always have it available because I need to put the lens away after use. Adding one more thing just creates more paraphernalia clutter on my very small stand area.

    Leave a comment:


  • David L. Baker
    replied
    Hello Janice,
    From Greensboro NC. I am wondering if you could use a scope adapter bracket to support your adapted lens. There is a short focal distance adapter for Kodak projectors that may work also. Elsewhere in this Forum I have a post for a Revere 85 lens and adapter for short distance projection. Your suggestion for a threaded lens ring is excellent. Thank you for the information. David L. Baker

    Leave a comment:


  • Winbert Hutahaean
    replied
    Originally posted by Nantawat Kittiwarakul View Post
    Why don't give it a shot?
    Yes.. I believe we have plenty broken video cameras nowadays. I got it for free.

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  • Winbert Hutahaean
    replied
    Originally posted by Janice Glesser View Post

    Did you ever have any focusing issues with your lens?
    Not at all. My conversion lens was taken from a broken Sony video camera. So I guess this not a cheap ones.

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  • Nantawat Kittiwarakul
    replied
    This is exactly what that had bugged in my mind for quite a long time.

    While dedicated short - throw projection lens / wide converter made for specific make/model of projectors would sometimes cost up to several hundreds $$$, these wide - converters for camcorder can be had REALLY CHEAP and readily available everywhere. Why don't give it a shot?

    Leave a comment:


  • Janice Glesser
    replied
    Hi Winbert... Thanks for posting the dimensions on the picture. A 15-ft throw is fantastic, unfortunately in my new house I can only go 12 ft. However using the wide angle lens gives me an image almost as big as my 16 mm.

    I highly recommend you trying to find a step up ring and attach it to the original lens instead of using the Cellotape. I have to remove my lens adapter after each use because my projector cover won't fit. Being able to just unscrew it and stick it in a case is very convenient.

    Did you ever have any focusing issues with your lens?

    Leave a comment:


  • Winbert Hutahaean
    replied
    Janice, this is something I did and reported in the old forum around 2013. Here is the link:

    https://8mmforum.film-tech.com/cgi-b...c;f=1;t=008126

    I used cellotape to attach the lens to the main lens.

    I re-upload below the projecting result from a throw distance at 15.75' ( = 4.8m) with comparison against my height (5' 9" = 175cm)

    Click image for larger version

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    Cheers,
    winbert

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  • Lee McCaffrey
    replied
    Those wide angle converters can be gotten fairly cheaply secondhand, most were designed for camcorders. As with any optics, the better the glass the better the quality. A 0.75 would enlarge by 33%, a 0.8 25% etc. The fisheye style lenses would probably cause too much distortion to be useful

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  • Osi Osgood
    replied
    Some popular titles there, and good job Janice!

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  • Janice Glesser
    replied
    Here's a short update to the wide angle lens solution. I found that on my Sankyo projector that it was going out of focus repeatedly. The wide angle lens was heavy and any movement from the projector would jar it to go out of focus. I decided to just put something underneath the lens to stabilize it. I used the lens case and one of the lens caps to keep it from moving up and down. It worked like a champ.

    I tested a couple of films to see if it held focus.

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    Click image for larger version  Name:	PXL_20220518_025226371~3.jpg Views:	0 Size:	81.3 KB ID:	60390 Click image for larger version  Name:	PXL_20220524_031553119.PORTRAIT~2.jpg Views:	0 Size:	62.9 KB ID:	60391 Click image for larger version  Name:	PXL_20220524_031201202~2.jpg Views:	0 Size:	58.9 KB ID:	60392
    Last edited by Janice Glesser; May 24, 2022, 12:32 AM.

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  • Brian Fretwell
    replied
    I do have an attachment made specifically for 8mm to give a bigger picture. It is called the "Spacial Sideral Attachment for 8mm cine". When I bought it I paid £3.50p. What it actually consists of is a very powerful negative diopter lens in a screw on mount with a slide in tube containing the lens. It adjusts the focal length of the projector lens, but considerably affect the focus.

    Unfortunately it doesn't seem to work with 16mm projectors.

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  • David Roberts
    replied
    Janice, Ive always thought super 8 projectors should have wider angle lenses,with maybe less at the tele end.Far more use in most lounges.
    My B&H DCT is sankyo made and similar to your 800. I use a sleeved Xenovaron lens in it,which has 11mm wide angle,and f1.1,so very bright.
    I would never have thought of trying a wide angle adapter like you have,well done.

    Leave a comment:


  • Mark Mander
    replied
    Brilliant Janice, great job, Mark

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  • David Baker
    replied
    WOW Janice !! YOU and Alan Gouger should team up for home theater installation !

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  • Dominique De Bast
    replied
    You're so amazing, Janice.

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