On Mon, 25 Jun 2001, Jan van Wijk wrote:
> On Mon, 25 Jun 2001 14:18:43 +0530 (IST), Ayash Kanto Mukherjee wrote:
>
> > Suppose I need a longer working distance than 1 feet, then you
> >should ask me to go for 200 mm Macro lens. In order to solve the problem
> >in cheaply, suppose I use a teleconverter of 2x ratio. That will convert
> >the present lens (100 mm MACRO) to 200 mm with a loss of two stops of
> >aperture. What happens to the Macro magnification ratio? Does it remains
> >1:1 or it decreases. I think remains as it is.
> >
> >Any comments?
>
> Actualy, you will have a 200mm f/5.6 macro that way that goes upto 2:1 (NOT 1:2)
> (assume you start with 100mm f/2.8)
>
2:1!! Waaaaooooooow! That's great.
> The focusing distance will stay the same, and you double the focal-length.
>
> The quality will decrease, edges and corners will suffer, probably some light
> fall-off too.
I am not happy to hear that but what to do that is the truth.
> But it could be a good solution for some (well lit!) objects in the center of
> the image.
> Regards, JvW
>
Many Thanks Jan. Again I should say, I learnt something new that a 2X
teleconverter on 200 mm MACRO LENS (1:1) doubles the magnification ratio.
With kind regards,
Ayash Kanto.
-
This message is from the Pentax-Discuss Mail List. To unsubscribe,
go to http://www.pdml.net and follow the directions. Don't forget to
visit the Pentax Users' Gallery at http://pug.komkon.org .
