On January 11, 2003 02:07 pm, [EMAIL PROTECTED] wrote:
> 3. Opti-Copy L-E-N-S ! (Uptown Gallery)
> 4. Hey I wasnt ready to send that. (Uptown Gallery)
> From: "Uptown Gallery" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Date: Fri, 10 Jan 2003 19:45:24 -0500
> Subject: [Cameramakers] Opti-Copy L-E-N-S !
> Reply-To: [EMAIL PROTECTED]
>
> OK - my experience & research.
>
> More lens info from my digging and scrounging and pestering:
>
> Helioprint process lenses 150 f/9 and 210 f/9. allegedly made by Staeble,
> and marketed with many names. There may be multiple designs, however.
>
> I emailed Helioprint (English on a German webform email contact - who knows
> who got the message) and Agfa on the rumor Agfa made Helioprint lenses.
>
> Here's the Agfa reply:
>
> Well, maybe my email software cut me off since I went on too long.!
>
> - Helioprint lens 1:8/150
> Aperture range 1:8 - 1:64
> At f/8: Angulare coverage 65�, image field diameter and
> magnification 1:1 380mm
> At f/22: Angulare coverage 68�, image field diameter
> and magnification 1:1 400mm
> magnification range 25% - 400%
>
> - Helioprint lens 1:8/210
> Aperture range 1:8 - 1:64
> At f/8: Angulare coverage 66�, image field diameter and
> magnification 1:1 540mm
> At f/22: Angulare coverage 68�, image field diameter
> and magnification 1:1 560mm
> magnification range 25% - 400%
>
>
> I just realized he sent me info on f/8 lens...this might be useless to me.
> Lot's of coverage, and interesting that they only give specs wide open and
> stopped partly down. I'm sure it means something that they do it that way.
I wonder if these are similar/same to the Agfa lens I got this week. Who did
you email at Agfa?-) The F/22 number is likely the best Fstop for the lens.
My understanding is proccess lens less then 600mm are best corrected at f/22.
The coverage numbers at 1:1 will be greater then those at normal use. The
rule of thumb I've been going by is 1/2 the 1:1 coverage at infinity.
I wonder if your lens are really f/8 and not f/9. See if the lens opens up
if you turn it past the f/9 setting. With these lens always being used at
f/22 I doubt if it really mattered just how fast they claimed.
FWIW the 105 [actually it's really 103.8mm hows that for accuracy] seems to
light up a 4x5 ground glass. But then mine is a super-intergon so who knows
if it's the same.
Nick
_______________________________________________
Cameramakers mailing list
[EMAIL PROTECTED]
http://rmp.opusis.com/mailman/listinfo/cameramakers
