Archived posting to the Leica Users Group, 2000/11/23

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Subject: [Leica] Re: LATER Zeiss LTM Sonnar lens
From: Andre Jean Quintal <megamax@abacom.com>
Date: Thu, 23 Nov 2000 21:11:37 -0500
References: <200011230130.RAA22285@mejac.palo-alto.ca.us> <002201c05562$2291a460$dd66989e@demon.co.uk>

  Being wartime, this lens is of all-aluminium
construction - part of the reason why it now looks
a bit shabby.
	--> For personal culture sake:

	Were there pre-1955 Sonnar LTM
	that were fabricated with more sophisticated
	materials ? Better optical glass formulations ?

	What was considered the 'reference' in those days
	in 35 mm photography ? Early Summicron ? Alpa ?

	OR: When did Summicron become available ?

	Sonnar VS Planar ? Is the 'Bokeh Factor'
	a valid consideration for these lens types ?

	How about a Planar LTM around f/2 ? 35mm ? 50mm?
	Did such ever come to the light of day ?

	Were Sonnar aficionados ever justified ?
	I think I've seen some non LTM Sonnar
	with quite impressive 'specs' for circa 1935 ...

	A 28mm or 35mm Biogon LTM ?????  !!!
	f/2.8 would be 'just fine'.

	So much for my Zeiss Ikon anxieties ...   :+)

	Andre Jean Quintal

In reply to: Message from "Doug Richardson" <doug@meditor.demon.co.uk> ([Leica] Re: Zeiss LTM Sonnar lens)