Re: Seitz Roundshot and QTVR technique

[Charles Tait <charles.tait@xxxxxxxxxxxx>]

Hi there

This list has suddenly come to life.

I use an Alpa Rotocamera, and have had excellent results scanning my shots on 70mm
film on an HP4c.  Admittedly I can't quite get 360 degrees in one go, but very
nearly.

They look really good printed out on my Epson 1520, so at last I can print my
pans.  Shots on the Horizont also work OK

Charles Tait

Jook Leung wrote:

> Hello eveyone,
>
> I'd like to start a discussion about scanning long films from  panoramic
> cameras like the Roundshot 220VR
> and processing them into stitchable files for QTVR.
>
> For scanning I've tried using a Umax PowerLook II flat bed transparency
> scanner and only get MEDICORE results.
> Newton rings are created when the film touches the glass and I would have
> to put the film in some kind of holder. But I'm not happy with the image
> quality of the scans anyway.
>
> I'm wondering if anyone out there scans long their negatives on a Nikon
> LS4500AF scanner. It suppose to
> be capable of handling "panoramic strips".
>
> I know some people get PhotoCD scans of their films that are shorter than 5
> inches.
> Any comments on PhotoCD and special handling? Ultimately Drum scanning?
>
> Anyone care to describe their technique on stitching say a 400 degrees
> Roundshot film for QTVR.
> I need a reliable receipe here!
>
> I've had the Roundshot 220VR for about 2 weeks now. An absolutley fine
> precision piece of equipment
> but it documentation/translation and usage is sparse leaves alot to be desire.
>
> So far I've only operated the camera with Auto Exposure and Variation Modes
> On and it seems to be
> quite reliable. Can more sophisticated users comment here.
>
> I'm thinking of trying a 28mm PC-shift lens for full coverage of the film
> area. Comments on favorite
> lenses? Slit sizes? Anyone use the camera without the slit aperature in
> place, giving about 3mm.
> Would this be a good technique in low light situations?
>
> Some of the mistakes I've made:
>
> Using the wrong "b" value for a particular lens gives incorrectly warped
> distortions. Will this also
> impact on the image's sharpness? Then setting the exact "b" value is only
> an approximation to half a mm on the rail!
>
> Some of my shots were soft in focus even for a 14mm lens!  Others were
> sharp and in focus.
> Do users set their lens focus at infinity and put that value into the
> RoundShot or can I apply closer focus setting and use hyperfocus-depth of
> field/f-stop settings to keep infinity also in focus?
>
> The term "Nodal point" is only mentioned once in the manual and is not
> normally accounted for as it is
> in other QTVR rigs. So that was absolutely confusing.
>
> Yikes, horizontal bands of flare at bottom of image: Taping a curved piece
> of black paper over the backside of the compendium will take care of the
> flare problems of the Sigma 14mm lens.
>
> <^J^>
>
> ---------------------------------------------------------------
> JOOK LEUNG    jook@xxxxxxxxx    http://360vr.com    201.894.5881
>  360VR PHOTOGRAPHY - Immersive Imaging - QTVR  LivePicture  IPIX
>          (^_^)OOK>>   j(^_^)k    J(^.^)K    J(^o^)K    J(^J^)K....vr


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