[Leica] 40mm filters and step-up rings

[joelct at singnet.com.sg (Joseph Low)]

           Ask Kevin Li

           www.kevincameras.com

           J Low

-----Original Message-----
From: lug-bounces+joelct=singnet.com.sg@leica-users.org
[mailto:lug-bounces+joelct=singnet.com.sg@leica-users.org]On Behalf Of Bill
Smith
Sent: Sunday, January 16, 2005 17:56
To: Leica Users Group
Subject: [Leica] 40mm filters and step-up rings

Gentlemen/ Ladies:

I recently bought a Canon 35/2 LTM lens and am having a hell-of-a-time
finding any of the above. Any help?

Bill

Philippe Orlent <philippe.orlent@pandora.be> wrote:
I've had this, too, with a Summicron 50 tab version. No filter, lens cap was
on, one roll of negatives, all shot on low speed (1/4th), at apertures
ranging from f:2 to f:5.6.
IMO it's plain lens flare: at the smaller apertures, you actually start to
see the iris leafs.
---
> From: "joe weil"
> Reply-To: Leica Users Group
> Date: Sat, 15 Jan 2005 17:51:10 -0800
> To: "Leica Users Group"
> Subject: [Leica] A little help please
>
> Hello,
> I am hoping that greater knowledge of this group will give me some insight
> to what I noticed on my negatives (Tri-X, shot at 400). I was shooting at
> night with an R-8 and an older Summicron R 90 (Canada, # 2,463,XXX). In
the
> negatives shot with this lens, I noticed a secondary image of a bright
> light source (a streetlight) in the negative as well. The street light was
> positioned in the lower right hand corner of the negative and the
secondary
> reflection was located in the upper left corner so it seems to be symetric
> about both the x and y axis. The secondary reflection was obviously
> stronger as exposure time was increased. I spot metered off the street
> light, opened up 2 stops and bracketed a couple stops in both directions.
I
> believe the aperture was somewhere between 2 and 4 and was constant when
> the exposures were taken. There was a Hoya 81A filter in front of the lens
> during the exposures.
> I checked the lens and filter to see if they were clean and there was
> nothing obvious on either.
>
> What would cause this secondary reflection, the lens, the filter or both?
> Has anyone else experienced this phenomena?
> I am planning an experiment to shoot with this lens at night with a single
> bright light source at a small, medium and large aperture, with and
without
> the filter. Metering would be performed the same as I did above with an
> obvious slant toward overexposure.
> If you have any other ideas of things that I could try to figure it out,
> please let me know.
> Thanks
> Joe
>
>
>
> _______________________________________________
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>

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