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Murray@uptowngallery.org · Joined: 03 Apr 2002 Posts: 164 Location: Holland MI

I didn't get a response to my add-on post to a thread about where to get lens boards.

I now have a different question in addition.

1) What shape lensboard would one recommend for a heavy barrel lens for an SG? I may end up having a machinist at work make one, and if that wheel has already been invented, it would be nice to make 3 wrong in figuring it out.

2) Those people who make their own from minimalist materials like acrylic and matboard (obviously for lightweight lenses)...I see the original shape board accomplishes some light trapping by fitting between two channels. I envision a potential for light leaks as well as fit problems with the slide locks if I use a flat board that protrudes further than the dimpled channel boards.

Thanks

Dan Fromm · Joined: 14 May 2001 Posts: 2144 Location: New Jersey

Murray@uptowngallery.org · Joined: 03 Apr 2002 Posts: 164 Location: Holland MI

I'm glad you only asked what I'm doing , not why

).

A different but large lens, about 4" diameter, 8" length. Shipping weight 4# per UPS tracker; I guess not much lighter in person.

I anticipated the need for a crutch.

I'll have the lens Friday. Once I see how much coverage I'll say more (whether it's an embarassing White Elephant or not). I know where it came from, who ordered it and built it, but I'm still bugging people for details.

I figured it was worth an experiment since I paid for it with stuff I had hoarded away anyway.

I'm not going to say any more because it's one of those things people always tell me 'don't bother trying', but I do it anyway.

Murray

Thanks

Murray

RichS · Posted: Thu May 19, 2005 5:20 am Post subject:

Murray... WHY????

Seriously, deffinitely 'go for it'! Like Dan said, the lens board is plenty strong enough for any lens the camera could possibly hold up. And if there's any rail extending beyond the front standard when set at infinity, you could always make a temp or permanent brace between the lens barrel and the front rails for extra support.

If we couldn't "play", what fun would it all be???

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"Ya just can't have too many GVIIs"

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Murray@uptowngallery.org · Joined: 03 Apr 2002 Posts: 164 Location: Holland MI

Uh, I'm hearing music..music from the Big Top, you know, Doot-Doot-doo-doo-doo-doo-Doot-Doot-doo-doo...I hear a voice, maybe P.T. Barnum's, telling me the elephant wasn't white...it was pink.

I'm not giving up yet, but I think this lens does what it was supposed to do and that IS all. Well, like the stock market, only invest money you can afford to flush.

)

At least I sold something out of my garage to pay for it, so I did gain a few cubic inches.

Oh, it was a flange-mounted 50-150 mm zoom (or varifocal, probably) for a 46 mm studio cam, f/4.5-32, 100 mm flange-to-film design distance and click-stop focus distances 3.5-18 feet.

So far I've only held it up in my hand with a piece of ground glass, and that has never really taught me anything about image circle anyway, unless it's obviously bigger than the glass in my hand. I'll try a lensboard on my CG which has a back so I can actually view an image. The SG is still missing a back so it's too many steps from feasible.

Murray
Murray

Dan Fromm · Joined: 14 May 2001 Posts: 2144 Location: New Jersey

Murray@uptowngallery.org · Joined: 03 Apr 2002 Posts: 164 Location: Holland MI

Yes, Kino, mfr of the Kiron lenses. It only has the name of the company that had them made on the lens ring.

Looked better outdoors at sunset than looking at light bulbs in the basement. I'm a little more positive again. I'm thinking a quick test will be a sliding lid box cam, a la the 1850 ones.

Murray@uptowngallery.org · Joined: 03 Apr 2002 Posts: 164 Location: Holland MI

This lens was used in the same company as (as an alternative to) Schneider Variogons, so if I can get any coverage out of it, I'm eager to see what it can do. Of course, in my hands, I may get distracted by something else interesting and not follow thru.

I have a suitable wooden box I may simply mount it in and bypass the hassle of lensboarding it on an SG. The clearance hole (2.303") needed for the back flange of the lens will fit inside the 4x5 CG/SG standard, but the 6-hole mounting pattern is dangerously close to, or over the CG/SG exterior lensboard space. There are six holes at 60 degree spacing about 3.4" diagonal. Only solution I can think of is congruent with my original intent of having a heavy board...thick board under lens flange so flange screws don't pass all the way thru the board, milled down at edges to fit under the slide locks.

I'll guess a 2x3 front standard would be even less cooperative.

Murray

Murray@uptowngallery.org · Joined: 03 Apr 2002 Posts: 164 Location: Holland MI

If I can hog some more BW here, can someone tell me the difference in size of the front standard opening for the 2x3 CG/SG vs the 4x5? I have 4x5's and can measure them, but have no 2x3.

Someone posted earlier (not sure if this thread) about using an aero-lens on (I thought) a 2x3; this would seem even more challenging than the same on the 4x5.

Thanks

Murray

Dan Fromm · Joined: 14 May 2001 Posts: 2144 Location: New Jersey

Dan Fromm · Joined: 14 May 2001 Posts: 2144 Location: New Jersey