Nelsonfoto Forums
May 24, 2012, 03:10:39 PM *
Welcome, Guest. Please login or register.

Login with username, password and session length
News: SMF - Just Installed!
 
   Home   Help Login Register  
Nelsonfoto Forums > Dude, I'm Geekin' Out Over Here! > DIY-ing to Try Something New? > Genesis of a Lens Hood...
Pages: 1 [2]
« previous next »
  Print  
Author Topic: Genesis of a Lens Hood...  (Read 712 times)
sandeha
Retired Pirate
Prolific Poster
*****
Posts: 3525


View Profile WWW Email
« Reply #15 on: September 10, 2010, 12:32:42 PM »
Yup, that'll be the lens design then.  The why of their inventing centre spot filters for WA lenses, though I wasn't aware of them being necessary for a 90mm.

Just checked - there's no darkening on the corners of my 90mm Angulon negatives, though I've always shot at f16 or f22. 
Logged
Isolette/Speedex Coloured Bellows Available
sandeha
Retired Pirate
Prolific Poster
*****
Posts: 3525


View Profile WWW Email
« Reply #16 on: September 11, 2010, 05:14:20 AM »
Lens coverage means different things to different people so concrete data will be hard to find.  However, if the image circle of the 90mm Angulon is just over 125mm the Optar may be slightly less.

http://www.largeformatphotography.info/forum/showthread.php?t=14915

That may be where the vignette is coming from.
Logged
Isolette/Speedex Coloured Bellows Available
Madrigal
Aspiring Bottom-feeder
Prolific Poster
*****
Posts: 2713

Rose L.

117226302 rosedoodle
View Profile WWW Email
« Reply #17 on: September 11, 2010, 06:22:46 AM »
Awesome. Nice work on the lens hood. I should make one of these.
Logged
Character, like a photograph, develops in darkness. -Yousuf Karsh
Scott
Prolific Poster
*****
Posts: 3568

bliorg
View Profile Email
« Reply #18 on: September 11, 2010, 10:06:58 AM »
Quote from: sandeha on September 11, 2010, 05:14:20 AM
Lens coverage means different things to different people so concrete data will be hard to find.  However, if the image circle of the 90mm Angulon is just over 125mm the Optar may be slightly less.

http://www.largeformatphotography.info/forum/showthread.php?t=14915

That may be where the vignette is coming from.

Well, that stinks.
Logged
It's better to fail spectacularly than apologetically...

http://scottperryphoto.wordpress.com/
Pages: 1 [2]
  Print  
« previous next »
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.16 | SMF © 2011, Simple Machines Valid XHTML 1.0! Valid CSS!