On 9 July 2012 03:25, Mark C wrote:
> I have never found a good explanation of what is going on when you reverse
> mount a lens. After using reverse mounted lenses quite a bit, I can say that
> reversing the lens allows you to focus closer. It also seems like the
> subject to lens distance does no
On Sun, Jul 8, 2012 at 10:25 AM, Mark C wrote:
> ... I have never found a good explanation of what is going on when you reverse
> mount a lens. After using reverse mounted lenses quite a bit, I can say that
> reversing the lens allows you to focus closer. It also seems like the
> subject to lens d
Glad that I could help.
There are two basic formulas that can help with macro work. You probably
know them but if not - the first is that when you put a lens on
extension the magnification equals the extension divided by the lens's
focal length. So a 100mm lens on 200mm of extension = 2x lifes
Mark, this is exactly the response I was hoping for. Thank you *very*
much. I never would have thought the lens would be the part causing
the problem, nor that wider angle lenses would produce greater
magnification (though that kinda makes sense now that I think about
it). I will try it with my FA
On 8 July 2012 02:40, Stan Halpin wrote:
> I would put the fixed extension tubes on the camera, then the bellows, then
> the hellicoid, then the lens.
For a moment I had the same thought, but then I remembered that in
extreme lens extension, especially for macro work, the first
preference is to
On 7/6/2012 10:52 PM, John Celio wrote:
So I have this setup for shooting seriously close-up macro:
https://picasaweb.google.com/lh/photo/CIUtr5fsiR0rzShfFjE08NMTjNZETYmyPJy0liipFm0?feat=directlink
That is: Camera / helicoid tube at 49mm / bellows at 137mm (approx)/
12mm tube / 20mm tube / 36mm t
John, I can't directly answer your questions, but have a couple of comments . .
.
I am not sure if there is any logic or some practical reason(s) for your
ordering of the components. But if it were me, I would put the fixed extension
tubes on the camera, then the bellows, then the hellicoid, th
When you reverse a lens the focus point is very close to the rear
element. With your setup the focus point is somewhere inside the lens
if not inside the bellows, (yes I know that's not technically true but
the hyperbole expresses the problem), use a longer lens and don't
reverse it if you wan
> 1. Is it possible to have a lens so far away from the sensor plane
> that focus can't be achieved?
yes.
> 2. What's the macro ratio of this setup as it is in the picture?
no idea. only way to know for sure is to focus an image and then shoot
a fine ruler to calculate it.
> 3. Does it make a d
So I have this setup for shooting seriously close-up macro:
https://picasaweb.google.com/lh/photo/CIUtr5fsiR0rzShfFjE08NMTjNZETYmyPJy0liipFm0?feat=directlink
That is: Camera / helicoid tube at 49mm / bellows at 137mm (approx)/
12mm tube / 20mm tube / 36mm tube / generic reverse mount ring / D-FA
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