From: infiniteMPG on
I have a Sony A100 DSLR and just snagged a good deal on a Rokinon
800mm mirror lens with the Rokinon 2X double to take it to 1600mm. My
tripod has a quick connect base mount and all this mass hanging off
the front of the camera body does not help the stability.

http://cdn2.overstock.com/images/products/L11915385.jpg

I have seen some ring mounts but none I have found are specific for
this lens. Also, just about the entire lens body turns when you focus
so not sure how that would work anyway as you couldn't fix the lens
and turn the camera body :O/ Was thinking about maybe a ring mount
for the 2X doubler but since the lens is so much larger in diamater,
not sure if I could find one that would stand off far enough to clear
the lens.

I doubt I am the first person to buy one of these lenses and was
wondering how people rigidly mount these to tripods without having the
camera body have to support the mass of the heavy lens?

All help greatly appreciated.
From: Russ D on
On Tue, 25 May 2010 09:29:23 -0700 (PDT), infiniteMPG <57classic(a)gmail.com>
wrote:

>I have a Sony A100 DSLR and just snagged a good deal on a Rokinon
>800mm mirror lens with the Rokinon 2X double to take it to 1600mm. My
>tripod has a quick connect base mount and all this mass hanging off
>the front of the camera body does not help the stability.
>
>http://cdn2.overstock.com/images/products/L11915385.jpg
>
>I have seen some ring mounts but none I have found are specific for
>this lens. Also, just about the entire lens body turns when you focus
>so not sure how that would work anyway as you couldn't fix the lens
>and turn the camera body :O/ Was thinking about maybe a ring mount
>for the 2X doubler but since the lens is so much larger in diamater,
>not sure if I could find one that would stand off far enough to clear
>the lens.
>
>I doubt I am the first person to buy one of these lenses and was
>wondering how people rigidly mount these to tripods without having the
>camera body have to support the mass of the heavy lens?
>
>All help greatly appreciated.

In case you don't get any better advice: You might want to look into
"rotating ring mounts" that are used for equatorial newtonian telescope
tubes. They allow the user to rotate the tube of the telescope to position
the eyepiece (on the side of the tube) to a more comfortable viewing
position while keeping the axis of the optics accurately centered. Warning:
they are not cheap! They are also not very compact nor lightweight. I also
doubt that you would be able to find them small enough for that tube. They
are generally used on massive reflectors (newts) of 12" dia. and larger.
Even if you do find one that works I doubt it will have a 1/4-20 thread for
tripod mounting. You would probably have to drill and tap it yourself. If
nothing else this might give you another venue to consider and research.

From: RichA on
On May 25, 12:29 pm, infiniteMPG <57clas...(a)gmail.com> wrote:
> I have a Sony A100 DSLR and just snagged a good deal on a Rokinon
> 800mm mirror lens with the Rokinon 2X double to take it to 1600mm.  My
> tripod has a quick connect base mount and all this mass hanging off
> the front of the camera body does not help the stability.
>
> http://cdn2.overstock.com/images/products/L11915385.jpg
>
> I have seen some ring mounts but none I have found are specific for
> this lens.  Also, just about the entire lens body turns when you focus
> so not sure how that would work anyway as you couldn't fix the lens
> and turn the camera body  :O/  Was thinking about maybe a ring mount
> for the 2X doubler but since the lens is so much larger in diamater,
> not sure if I could find one that would stand off far enough to clear
> the lens.
>
> I doubt I am the first person to buy one of these lenses and was
> wondering how people rigidly mount these to tripods without having the
> camera body have to support the mass of the heavy lens?
>
> All help greatly appreciated.

I don't know if I'd spend the $300+ needed to mount a lens like that.
It might not be worth it, if you only use the tripod for it.
From: Bruce on
On Tue, 25 May 2010 09:29:23 -0700 (PDT), infiniteMPG
<57classic(a)gmail.com> wrote:

>I have a Sony A100 DSLR and just snagged a good deal on a Rokinon
>800mm mirror lens with the Rokinon 2X double to take it to 1600mm.


A good deal? They must have paid you to take it away. ;-)

The only "good deal" on a lens like that is no deal at all. In other
words, don't even think of wasting your money on one.

From: infiniteMPG on
> The only "good deal" on a lens like that is no deal at all.  In other words, don't even think of wasting your money on one.

Already done. Maybe you have a better way of getting a 800mm-1600mm
lens for under $200? Even with fair quality shots it's a nice new toy
and without knowing a thing I already snagged a few neat long distance
shots.