Re: [APML] Zenitar 16mm f2.8 "fisheye" - not entirely happy (yet?)

[Stuart Heggie <stuart.j.heggie@sympatico.ca>]

Dominic - much trepidation I feel at this prospect but it sounds like I 
should take some parts off and see if I have the same problem as this 
chap - establishing what constitutes infinity by eye will be trickly. 
Sigh (but THANKS for the tip!)

Stuart

Dominic Cantin wrote:

> Hi Stuart !
>  
> I dont have these problems with my lens !? I found a site ( by typing 
> " focus zenitar 16mm f2.8 fisheye " in Google ) where the guy seem to 
> had the same prob. as you !!! Take a look here 
> http://etischer.com/zenitar/zenitar16mm.html I hope that can help !
>
> Stuart Heggie <stuart.j.heggie@sympatico.ca> wrote:
>
>     I have been playing with my new lens and have some "observations".
>     I'm
>     hoping I'm wrong but I find the following:
>
>     1. I bought the lens for my manual focus F2's and so was expecting
>     the
>     "prong" that indexes the photomic prism on my F2's - it has no
>     prong.This means I have to spend a wack of time interpolating from
>     the
>     last position the photomic finder was at and my shutter speed - if it
>     was left at 5.6 (usual) I have to fool with the shutter speed till
>     I get
>     an appropriate exposure setting then figure out what speed to shoot
>     given the f-stop I'm going to use - what a hassle!
>     2. I assumed infinity would be infinity - this lens does not seem
>     able
>     to focus at infinity and I have to stop it down to about f5.6 or even
>     f8.0 before the preview button gives me confidence that the distant
>     horizon is in focus. My star trail pics are shar! p but they were
>     at f8.0.
>     Note: I have the clear filter in place, I guess I could try
>     without it
>     but that seems counter intuitive.
>
>     My frustration, if I can call it that, is that I bought it for aurora
>     more than anything and I would shoot the aurora wide open so if it
>     won't
>     hit infinity at f2.8, I wasted my money. Further, all this fooling
>     around because there is no indexing prong is a pain. Sigh.
>
>     Any ideas or similar experiences?
>
>     Stuart
>
>     _______________________________________________
>     Astro-Photo mailing list
>     Astro-Photo@seds.org
>     http://seds.org/mailman/listinfo/astro-photo
>
>
>
> Dominic Cantin
>
> http://skyphoto.homestead.com <http://skyphoto.homestead.com/>
>
> http://spacew.com/gallery/DominicCantin 
>
> dominiccantin@yahoo.ca <mailto:dominiccantin@yahoo.ca>
>
>
> ------------------------------------------------------------------------
> Lèche-vitrine ou lèche-écran ? Yahoo! Magasinage 
> <http://cf.shopping.yahoo.com>.
>
>------------------------------------------------------------------------
>
>_______________________________________________
>Astro-Photo mailing list
>Astro-Photo@seds.org
>http://seds.org/mailman/listinfo/astro-photo
>  
>


_______________________________________________
Astro-Photo mailing list
Astro-Photo@seds.org
http://seds.org/mailman/listinfo/astro-photo