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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: Wayne Shumaker <om3ti@xxxxxxxx>
Date: Tue, 29 Jun 2021 05:52:27 -0700
At 6/28/2021 05:42 AM, Joel wrote:

>I had the same thought, though I understand Mike's disappointment, too.  If
>you go to Disneyland, you're probably hoping there's more than one ride
>working.
>
>I have what is probably a stupid question.  I would use a lens like the DZ
>50-200/2.8 or the floater DZ 40-150 to get a respectful working distance,
>and I'm satisfied with the IQ (whether I should be or not).
>
>Why should I be investigating the use of a diopter?  Tick the boxes:
>
>*  Allows use of a desired lens not otherwise serviceable in the
>situation/setting
>*  Improves working distance
>*  Allows use of a lens of better quality not otherwise useable for the
>capture, especially desirable because of the speed of the lens or the
>characteristics of the glass
>*  Allows some marriage of non-native glass to foreign camera body
>*  Allows a lighter kit
>*  Esoteric qualities, approaches unobtanium standards
>*  Other -- please specify
>
>Inquiring minds -- are lazy.  I know I could look something up, but I like
>the conversation.  Thanks in advance.
>
>Joel W.

I gave up on getting a diopter as all the good ones are no longer made and the 
remaining ones have probably been bought up by Moose and Mike :-). Hence my 
approach is a lens with good magnification natively. And if you do find one of 
the coveted diopters, expect a high price tag. Hence it is likely a matched 
1.4X to the lens is the better option.

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.

There was a some diopter discussion on the list around 10/13-14 2020 titled
"[OM] IMG: Macro Experiment with Leica-R 60 Elmarit Macro  L"
Check out Moose's excellent notes on 10/14/2020

WayneS
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