Re: ------------ MAIL ----------------

[BBAIN@imnet.com (BBAIN)]

     Charlie:

           FWIW, I had an older 90mm 2.8 Elmarit (chrome) that may have had 
     some internal reflection problems.  John Van Stelten did some digging 
     and may have identified an issue with the diaphragm blades in mine, 
     which were quite worn and shiny.  Whether the optical formula is the 
     same, and a similar problem could arise in the newer lenses, I can't 
     say,  but you might ask him.
     >     

>At Sept. 22 Charlie wrote and Alf replied:
>     
><<< I have a 90/2.8 that I bought new in Jan. of '97. 
>     
>I've used it a couple of times to take long exposure photos of the full 
>moon lighting clouds. On both occasions the lens produced a spot in each 
>frame that I attribute to an internal reflection of the moon's disc. The 
>hood was extended, no filters were in place, and the glass was clean. I can 
>see no flaws in the coatings. I can see no obvious defects looking through 
>the glass into the barrel. The internal reflections appeared first on color 
>print film and then on Kodachrome--they aren't coming from some trick of 
>processing. I haven't noticed my Canadian 35 Summicron doing this. >>>
>     
>     
>Although not with the 2.8/90, I covered the recent eclipse of the moon with 
>the (old) 4/ 200 Nikkor AI, the 2.8/ 120 mm Biometar (MF), and the 2.8/80 
>Planar (MF) at max opening and 10 to 15 sec (E100s). There are no 
>reflections, neither in the pix of the full moon, nor in the diamond ring, 
>or even in several severely overexposed slides (40 to 50 sec).
>     
>I'm afraid, it's something with your 2.8/90. 
>     
>Alf
>     
>