Graflex.org Forum Index Graflex.org
Get help with your Graflex questions here
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Ektar Lens

 
Post new topic   Reply to topic    Graflex.org Forum Index -> Lenses Help
View previous topic :: View next topic  
Author Message
wfhguy



Joined: 12 May 2001
Posts: 10
Location: NY State, Albany area

PostPosted: Sat May 12, 2001 4:22 pm    Post subject: Reply with quote

I was inspecting an Ektar 127mm lens recently, thinking of replacing my 127mm Optar. On close inspection, the Ektar had several bubbles in the glass. Is this common for Ektars or is it a fluke? I'm surprised a lens with bubbles would make it through quality control.
Back to top
View user's profile Send private message
Les



Joined: 09 May 2001
Posts: 2682
Location: Detroit, MI

PostPosted: Sun May 13, 2001 3:14 pm    Post subject: Reply with quote

small bubbles in glass in common, some people believe it's a sign of better glass, since the bubbles are formed by mixing more than one type of glass in a molten state. If the bubbles are spherical, there is no problem.

I have a lens made about 1840 that show distorted bubbles, which are a sign of striation (incomplete mix of the glass types) This leads to image degredation
Back to top
View user's profile Send private message
wfhguy



Joined: 12 May 2001
Posts: 10
Location: NY State, Albany area

PostPosted: Sun May 13, 2001 6:21 pm    Post subject: Reply with quote

How is it that bubbles wouldn't degrade the image? Wouldn't the light be scattered and distorted as it passes through? Thanks...
Back to top
View user's profile Send private message
Les



Joined: 09 May 2001
Posts: 2682
Location: Detroit, MI

PostPosted: Sun May 13, 2001 9:47 pm    Post subject: Reply with quote

I'm not sure why, but all I know is, you won't be able to find the difference with a 7x loupe on a 4x5 transparency.

I think it might be the ratio of the size of the bubble to the size of the glass, ie not enough rays of light getting scattered.
Back to top
View user's profile Send private message
wfhguy



Joined: 12 May 2001
Posts: 10
Location: NY State, Albany area

PostPosted: Sun May 13, 2001 11:19 pm    Post subject: Reply with quote

That makes sense...thanks for the info!
Back to top
View user's profile Send private message
brushworker



Joined: 26 Aug 2001
Posts: 1
Location: North West New Jersey

PostPosted: Sun Aug 26, 2001 7:56 pm    Post subject: Reply with quote

My 1947 Ektar 127mm lens has me stumped. Where can I get a 38mm polarizer for my series 6 filter adapter? B+H does not seem to carry this or any series 6 filters. Is there any field-expedient solution out there?
Back to top
View user's profile Send private message Send e-mail Visit poster's website
Henry



Joined: 09 May 2001
Posts: 1427
Location: Allentown, Pennsylvania

PostPosted: Mon Aug 27, 2001 12:16 am    Post subject: Reply with quote

Dear Brush,
I'm not sure what size Series VI slip-ring fits a 127 Ektar (is it the 38mm you mentioned?), but if you already have the slip-ring then you're half-way there. The thread in your Series VI slip-ring is 44mm. Obtain a 44-49 step-ring (or 44-52, 44-55 etc.) and you can use a 49mm (52, 55, etc.) polarizer directly on this adapter set-up. Or look for a Series VI polarizer---I found a mint Spiralite recently at a camera show---it will already have the 44mm thread and will screw right into the Series VI directly. Caution: older polarizers seem to develop permanent fog spots in the glass, so make sure any used polarizer is really clean! In general, camera shows are the best places to look for all this sort of discontinued stuff. Since you're in northwest Jersey there are camera shows several times a year, in the Delaware Valley-Philadelphia area, also in the metro NYC area.
Check Shutterbug magazine for listings.
_________________


[ This Message was edited by: Henry on 2001-08-26 17:22 ]
Back to top
View user's profile Send private message
leski



Joined: 06 Sep 2001
Posts: 2
Location: Nortwest NJ

PostPosted: Thu Sep 06, 2001 11:05 am    Post subject: Reply with quote

Bless you, Henry,

And thanks for your information. Sorry to reply so late. Been away. Yes, it's the 127mm Ektar (1947) and I now understand 38mm is the slip-on size. Hope to get my 44-52 step-up in the next few weeks.
Back to top
View user's profile Send private message Send e-mail
Display posts from previous:   
Post new topic   Reply to topic    Graflex.org Forum Index -> Lenses Help All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group