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Re: [OM] IMG: Macro Experiment with Leica-R 60 Elmarit Macro Lens

Subject: Re: [OM] IMG: Macro Experiment with Leica-R 60 Elmarit Macro Lens
From: Wayne Shumaker <om3ti@xxxxxxxx>
Date: Tue, 13 Oct 2020 07:57:01 -0700
At 10/12/2020 09:41 PM, Moose wrote:

>On 10/8/2020 4:42 PM, Ken Norton wrote:
>>>This is by focal length shortening and  thus reduction in working 
>>>distance--not always conducive to chasing critters but results in less light 
>>>loss than extension.
>>There is, of course, one other method and that's to use a diopter on
>>the lens. That can be through the use of a designed-for-macro-use
>>diopter,
>
>Jim knows about that, although we haven't seen anything from his 135 Takumar 
>with Olympus IS/L Lens A-Macro H. Q. Converter f=40cm  dia. 49mm for a while.
>
>This is far my preferred method. So light, so quick, so easy, no lens changing 
>and lens/tube/body juggling - and excellent results.
>
>In a place like a botanic garden, I may be found palming one, on magnetic 
>filter holder, and popping it on and off.
>
>The problems are two:
>
>Not all AC-U lenses work well with all lenses. And there's no way to tell but 
>trial and error, other than copying Moose. ;-)
>
>The selection is not ideal. Many of these lenses are discontinued, and some 
>are hard to find. The Pentax 67 T132 is so important to me that I had a watch 
>on the 'Bay for ages before snagging a back up.
>
>( There is an apparent difference between older and newer AC-U lenses. the 
>older ones seem to generally have stronger curvatures. The diopter is simply 
>the difference between front and read "powers". My suspicion is that most 
>older ones are designed to minimize reflections between AC-U and main lens. 
>Later ones have MUCH better coatings, and flatter curves. Oly's latest, for 
>smaller µ4/3 lenses is a bit like looking into a black hole.)
>
>>or a reversed 50/1.4 sitting on the front of another lens.
>
>Optically a fine option, practically, a big, unnecessary pain.
>
>Getting Closer Moose

As you say, highly unlikely to come across a Pentax T132 (+0.76 d) or the T226 
(+0.44 d).

I have the Sigma AML72-01 (+1.74 d) and is too much diopter for my use. The 
less than +1.0 achromatic diopters seem to be rare indeed. Price usually puts 
them out of practicality also.

I found this list of achromatic close-up lenses:
http://fuzzcraft.com/achromats.html

>From this list there is also a Minolta close-up lens (+0.33 d) 72mm thread. 
>One on echBay for only $500.

For shorter focal length lenses, smaller filter thread and higher diopter, 
there are more options. Perhaps the Minolta No. 0 (+0.94 d) (52mm) only $30 on 
the 'Bay.

Years ago I experimented with the OM 180/2 with extension and 1.4X 
teleconverter with somewhat OK results. The faster 180/2 lens helped with that 
combination. Working distance was great.

Working distance is sacrificed with the diopter option. I only try using the 
close-up filter option for static subjects, while working distance is more 
valuable for me in the field.

For now I use my Zony zoom lens at 0.35x or PL 100-400 at 0.25x. The Olympus 
50-200mm f/2.8-3.5 ED SWD has 0.21x and worked good with the E-1:

https://photos.app.goo.gl/Y7pGPkd9epLAJ9Tz6
E-1 50-200mm @ 200mm.

social bug working distance - WayneS
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