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Re: [OM] "4th of July" B'fly count at Appleton Farm

Subject: Re: [OM] "4th of July" B'fly count at Appleton Farm
From: Mike Gordon via olympus <olympus@xxxxxxxxxxxxxxxxx>
Date: Tue, 29 Jun 2021 23:24:04 +0000 (UTC)
Cc: usher99@xxxxxxx
<<DZ 40-150 0.16x  MFD 0.9m  58mm thread
<<DZ 50-200 0.21x  MFD 1.2m  67mm thread  (Pentax T132)
<<PL 100-400 0.25x  MFD 1.3m  72mm thread

<<http://fuzzcraft.com/achromats.html

<<For example, in 72mm the Minolta close up lens is priced around $400
<<https://www.ebay.com/itm/114237016097
<<T132, good luck finding one of these.

<<I bought the Sigma AML72-01 (72mm) and is too much diopter (+1.74) for my 
case.

The max working distance isn't  ideal for skittish critters but plenty good 
enough for some macro.   It was designed to be useful for 80-300 but as Moose 
states,
doesn't perform optimally on the PL 100-400.  I recently tried on the 12-100 
again and need to process the images, but I think it might be OK. 
These achromats need to go on dates with those zooms to see if compatible as it 
is very difficult to predict how the optics will meld.  The Pentax T132 is 
married to the PL 100-400--'till death do they part.  Moose has performed an 
abundance of useful matchmaking  (also known as MMM--matchmaker Moose).  
One might try the Sigma on the DZ 50-200.

MIke
-- 
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