Before investing in the 2X close-up lens for the 80mm macro (focal
length = 170mm) you might try a reversed 200mm f/4 mounted on the 80mm
with a reversing ring or some other prime in the range that might give
you suitable magnification. You'll get good image quality at the
expense of working distance (lens flange to film distance if both lenses
are focused at infinity) and possible vignetting (solved by adding
extension to the main lens). Regaining working distance can be done by
using another bellows lens or enlarger lens that doesn't have the
camera's lens mount to contend with.
Chuck Norcutt
On 4/15/2011 5:25 AM, Dawid Loubser wrote:
> Hi Mike,
>
> This all depends on how critical the image quality is (assuming you can,
> for your given project, settle on the best compromise between shallow
> DOF and diffraction blurring in the first place to even nearly exploit
> the lens' true capability). How are you going to output?
>
> I have both the old non-automatic-diapgragm 80mm f/4 and 38mm f/3.5
> (RMS-mount).
> At 2x, my opinion is that the 38mm is a better performer than the 80mm
> plus
> close-up lens, but again, only if you can actually achieve an
> extremely high
> output quality due to all other factors being accounted for. Is this
> with
> an OM body, or digital?
>
> Since you have the 38mm, I would say - if you can live with the short
> working
> distance, use it. If not, use the 80mm.
>
> Only get the 80mm close-up adaptor if you really *must have* a new OM
> toy :-)
>
>
> On 15 Apr 2011, at 12:41 AM, usher99@xxxxxxx wrote:
>
>> I have an upcoming project for which 2X mag is just the ticket.
>> Moose's interest in this CU
>> lens for the 80mm macro rekindled my interest. I had largely
>> dismissed
>> it --as it is close to a 6 diopter lens
>> would necessarily degrade the image quality substantially at least
>> away from the center. Perhaps if they
>> carefully designed it for the 80m macro it would do well enough.
>> From
>> what I can glean from the archives and a link from Moose it appears to
>> be a 2 element achromatic style CU lens. I think Dean IIRC, did not
>> like the IQ that much and thought the 38 macro trumped it
>> by a wide margin. I do have the Z. 38/2.8 and the Z. 80mm in hand
>> already. I am not sure about the working distance comparison but it
>> must be better than the Z. 38 macro at same mag.
>> I I have only seen one or two images with it over the years and
>> think I
>> perhaps should take another look.
>> Any comments appreciated.
>>
>> High Mag Mike
>> --
>> _________________________________________________________________
>> Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
>> Archives: http://lists.thomasclausen.net/mailman/private/olympus/
>> Themed Olympus Photo Exhibition: http://www.tope.nl/
>>
>
--
_________________________________________________________________
Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
Archives: http://lists.thomasclausen.net/mailman/private/olympus/
Themed Olympus Photo Exhibition: http://www.tope.nl/
|