[W&B] Magic Lantern Lens vs. Petzval Portrait Lens

[Dan Colucci]

What the heck is the point of optimizing a Petzval for infinity ?  Its a
one trick lens built for blazing speed and short focus - why would it be
optimized for infinity..?

________________________________

From: woodandbrass-bounces at kjsl.com
[mailto:woodandbrass-bounces at kjsl.com] On Behalf Of Milan Zahorcak
Sent: Monday, January 28, 2008 1:08 PM
To: 'Collectors of 19th Century Cameras &Photographica'
Subject: RE: [W&B] Magic Lantern Lens vs. Petzval Portrait Lens


Yes, most photographic lens from the very beginning were/are.  Process
lenses, for example, aren't - usually some intermediate working
distance.
 
mz
 
 

	-----Original Message-----
	From: woodandbrass-bounces at kjsl.com
[mailto:woodandbrass-bounces at kjsl.com] On Behalf Of Dan Colucci
	Sent: Monday, January 28, 2008 10:08 AM
	To: Collectors of 19th Century Cameras &Photographica
	Subject: RE: [W&B] Magic Lantern Lens vs. Petzval Portrait Lens
	
	
	Are you saying the Petzval Portrait Lens is optimized for
infinity ?  

________________________________

	From: woodandbrass-bounces at kjsl.com
[mailto:woodandbrass-bounces at kjsl.com] On Behalf Of Milan Zahorcak
	Sent: Monday, January 28, 2008 12:53 PM
	To: 'Collectors of 19th Century Cameras &Photographica'
	Subject: RE: [W&B] Magic Lantern Lens vs. Petzval Portrait Lens
	
	
	 
	There are differences between ML and PL (ohh!, I like the
abbreviations).  Both are Petzval designs, but use determines whether
optimized for infinity focus, or obviously, projection.  But hard to see
the difference if you do either with the other.
	 
	Physical characteristics, at first glance, I'd guess it's an ML.
Short hood (angle for projection) and that simple knob.
	 
	I could do a piece on portrait vs projection lenses - anyone
interested?
	 
	mz
	 
	 
	 
	 

		-----Original Message-----
		From: woodandbrass-bounces at kjsl.com
[mailto:woodandbrass-bounces at kjsl.com] On Behalf Of DColucci at aol.com
		Sent: Monday, January 28, 2008 9:32 AM
		To: woodandbrass at kjsl.com
		Subject: [W&B] Magic Lantern Lens vs. Petzval Portrait
Lens
		
		
		
		ok, I got this lens today and it is indeed a Petzval
design with 2 groups, 4 elements with the rear elements "spaced" with a
ring.  Only trouble is there is NO provision for any stops.  I do know
that Darlot ( in the 1880's at  least )  made portrait lenses without
provision for stops - but those were advertised for Magic Lantern use.
I also think I recall that some very early Portrait Lenses didn't come
with provisions for stops as they were just meant to be used wide open..
so what do I have here, a Portrait lens or a ML lens  ?  
		 
		Thanks
		Dan
		 
	
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=140199480134&ssP
ageName=STRK:MEWN:IT&ih=004
		 
		 
		 
		PS -  ( there are no markings on it )



		
________________________________

		Start the year off right. Easy ways to stay in shape
<http://body.aol.com/fitness/winter-exercise?NCID=aolcmp00300000002489>
in the new year. 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.kjsl.com/pipermail/woodandbrass/attachments/20080128/1370d95b/attachment-0001.html