[pure-silver] Re: recessed lens board, was wide-angle lens for4x5
- From: DarkroomMagic <info@xxxxxxxxxxxxxxxx>
- To: PureSilverNew <pure-silver@xxxxxxxxxxxxx>
- Date: Sun, 30 Oct 2005 16:09:47 +0100
Don
Can you post a picture somewhere?
Regards
Ralph W. Lambrecht
http://www.darkroomagic.com
On 2005-10-30 14:11, "Don Feinberg" <ducque@xxxxxxxxxxxxxx> wrote:
> I gather that "I have a secret" that I haven't seen anyone else ever write
> about.
>
> If you buy a couple of Forstner-style wood boring bits, imported Chinese
> versions of which are available very cheaply today, you almost trivially can
> get absolutely perfect, flat bottomed round holes for lensboard use.
>
> I would not and do not recommend the Chinese-made Forstner bits for heavy
> duty, that is, regular day-to-day use. They don't stand up to it. But for
> making a couple of lensboards? Absolutely perfect. This includes making
> recessed lensboards **out of one piece of wood**. (Admittedly, I did once
> make a sample recessed lensboard on the *lathe* (metal lathe, of course),
> with nice chamfered walls to the recess, just for sport.)
>
> Just remember to bore the larger holes -- to make the shoulders for rings,
> etc, if necessary -- first! :-) :-) :-) And "oh" -- it really is
> necessary to use a drill press and low speed; I use 300 rpm. Using a hand
> held drill will result in a total mess and is personally dangerous. Don't
> drill "through" from one side. First, drill the second side slightly, like
> 1 or 2 mm (1/16" or 3/32"), then drill through from the first side. That
> way, absolutely no splintering. Is that too obvious to mention?
>
> I've been making lens boards this way for years. Consistently perfect, the
> first time. Of course, this only works in wood or plastic.
>
> Alternatively, if you're going to use a saber saw to make lensboard holes,
> don't try to make your cut along the circumference. Rather, drill a smaller
> hole, like 1/2", in the center, then saw *radially*, from the center
> towards the circumference. Make about 25 such cuts; it is easy to stop
> cutting just clear of the circumference. Then it's easy to cut out the
> resulting wedges without sawing across the circumference, and you can
> readily finish things into a rather clean circle. This is not as nice, and
> is much more work, then using a Forstner bit. But it is much finer than
> trying to cut along the circumference, then sanding. Preferably, don't do
> this with plywood! Use a new, premium quality, fine kerf / fine tooth
> blade.
>
> Don Feinberg
> ducque@xxxxxxxxxxxxxx
>
> ----- Original Message -----
> From: "richard l. gifford" <rlgif@xxxxxxx>
> To: <pure-silver@xxxxxxxxxxxxx>
> Sent: Tuesday, October 25, 2005 5:16 PM
> Subject: [pure-silver] Re: recessed lens board, was wide-angle lens for4x5
>
>
>> For those who make their own lens boards from wood, it takes only a little
>> imagination to laminate pieces and make your own recessed board. Mine
>> took some time, obviously at least three times as long as making one
>> piece. But time spent this way is time enjoyed. This was for my 90mm
>> Linhof/Schneider Angulon on 4x5. I vaguely recall this is the one where I
>> mounted the lens a little below center so the thing would clear when
>> angled in during installation on the camera. I do a fast cardboard
>> prototype to check clearance before committing labor to wood. Labor is
>> cheap, 1/8" 3-ply is hard to find now.
>>
>> Someone mentioned elsewhere boring the hole. This is simple in wood, with
>> a saber saw. A perfect circle is not needed, just an approximation that
>> is fine tuned by sanding the high spots until the lens slips in.
>>
>> And the tip I got from Mr K, Krylon Ultra Flat Camo is the flattest black
>> out there. I always use an ebony stain first, but I'm not sure I can
>> justify that with any rational argument. Bare wood absorbs a lot of spray
>> paint, and maybe I noticed my first board looking glossy like maybe the
>> flat stuff soaked in and left the shiny stuff on the surface (excuse my
>> highly technical paint terminology).
>>
>> Regards... Dick Gifford
>>
>> Dave Hornford wrote:
>>
>>> I have a bag-bellows for my 90mm, but find my lack of a recessed
>>> lens-board
>>> a bigger hindrance.
>>>
>>> Dave
>>
>>
>>
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