Re: [APML] hasselblad ap?

["Taras R.Hnatyshyn" <tarashnat@earthlink.net>]

Jeff,

Infinity focus: The Tele-Apotessar (500mm f/8), Tele-Superachromat 
(350mm f/5.6), and Telephoto Power Pack (300mm f/2.8 for focal plane 
shutter bodies only) lenses, I believe, all focus beyond infinity to 
allow for use in wider temperature ranges. I would assume it is more 
useful for warmer environments when the lens barrel lengthens... I 
mostly have the older C T* lenses and two F T*, though my focal plane 
body is in need of repair. These all have a hard stop at infinity. Of 
the above mentioned lenses, I only have the Apotessar.

Mirror lock up?: The 500 series manual bodies have a mirror pre-fire 
which swings the mirror up and opens the auxiliary (focal plane) 
shutter. One cannot return the mirror without releasing the shutter. 
The 500EL series and 2000 series had various shutter modes which 
governed whether the mirror would return or not when the shutter was 
re-cocked after exposure. I am not as familiar with the 200 series, as 
they introduce more electronics.

Battery: The manual 500 series cameras do not have a battery. The 500 
ELs have a battery(s) for the film advance mechanism. The 2000 series 
has a battery for the electronic shutter. The 2000 series should not 
have the battery run out during the normal life of the camera, but star 
trails in sub-freezing temps kills just about any camera's battery. I 
prefer the 2000 for those intermediate exposures (from 1 sec. to 1 
min.). Some 2000s can run leaf-shutter lenses without battery power, 
but not all. The 200 series requires batteries since they have more 
automated features.

Screens: The old focusing screen is quite dark. The Acute Matte screens 
are adequate.

Lenses: The 80mm f/2.8 Planar that comes with most kits has noticeable 
coma in the corners. Of the other lenses I tried, I have not 
experienced this aberration. The old 40mm f/4 Distagon I used for my 
star trails suffers from distortion, but otherwise the images are quite 
acceptable. The newer versions of this lens (which are out of my 
budget) are supposed to be much better.

Film flatness: I haven't noticed any issues, but then again, I haven't 
been shooting hypered Tech Pan in extremely long exposures. I might get 
the fortitude to try Tech Pan with my fisheye in the future, just to 
see how many stars I can resolve with it... it should make a great 
combination for a Milky Way shot! I also haven't been looking _that_ 
closely at my transparencies.

Taras

On May 28, 2004, at 11:22 AM, Jeff Crilly wrote:

> Jeff:
>> The first question should be......Do you already own or have acess to 
>> a Hasselblad system?
>> The Hasselblad system is a wonderful thing, but exceedingly expensive.
>> Can it be used successfully for astrophotography? Yes, and there have 
>> been
>> several who have produced excellent images with it.
>
> Have potential access.
> I'm shopping for a 6x7 for the fsq, but this is another route.
>
> It sounds like a good approach.  Especially if one has decent
> lenses.  Taras' constellation shots have nice round stars to the
> edge.  (Taras: you need to get that setup to dark skies.)
>
> Another question(s):
>
> what about mirror lockup?  Does the hasselblad
> need a remote battery, etc, to support mirror lockup?
>
> How about focusing?  If these premium lenses are calibrated
> to focus at infinity, then no problem. (I've used 35mm,
> where infinity is sometimes not infinity.)  But prime
> focus will require focusing.  Is the focusing screen
> acceptable?
>
> jeff
>
>
>
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>
>
--
                         <end of message>
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* Taras R. Hnatyshyn                     tarashnat@earthlink.net *
*    http://homepage.mac.com/tarashnat/astrophoto/welcome.html   *
*  73°59'18.4"W 40°43'37.2"N    or    74°25'24.4"W 41°40'42.0"N  *
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