Is the solution to spherical aberration in optical equipment on the way?

It would be nice if it reduced the cost and weight of quality optics

see www.gizmodo.com.au/2019/08/a-mexican-physicist-solved-a-2000-year-old-problem-that-will-lead-to-cheaper-sharper-lenses/

[I would like to see the equation laid out on a single line [even if it were a metre long]

Regards, Laurie

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advice re: Golden-shouldered Parrots

Hi All, I am headed to Iron Range in a couple of weeks. Can someone please assist regarding a reliable way of seeing Golden-shouldered Parrots? ie, advice for contacts/permissions for suitable locations Thanks Dave Dickson

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Kowa

Hi all I tried to organise some scope parts for Aidan Sudbury this week and was helped through a friend of a friend in the USA. Not Donald!

 

Steve Sosensky

Optics4Birding

www.Optics4Birding.com

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Power outage at Cornell affecting eBird

See https://emergency.cornell.edu/.. There would seem to be a fair chance this is why eBird servers are down at the moment (and have been for some hours). Martin Butterfield http://franmart.blogspot.com.au/

Fwd: Kowa scope problem Aiden Sudbury

Received from Alan McBride:

———- Forwarded message ——— Subject: Kowa scope problem Aiden Sudbury

Aiden or anyone who has his contact details. Please get in touch with me on amcbride01@gmail.com. I have a contact in US who is saving you an Kowa eyepiece for a day or so. Cheers Alan Alan McBride : +61 481 . . . → Read More: Fwd: Kowa scope problem Aiden Sudbury

Birding-Aus Digest, Vol 70, Issue 6

I do not know but I doubt it. My point was more that they are ubiquitous.

Sent from my iPhone

> On 8 Aug 2019, at 2:00 am, birding-aus-request@birding-aus.org wrote: > > Send Birding-Aus mailing list submissions to > birding-aus@birding-aus.org > > To subscribe or unsubscribe via the World Wide Web, visit > birding-aus.org/mailman/listinfo/birding-aus_birding-aus.org . . . → Read More: Birding-Aus Digest, Vol 70, Issue 6

Birding-Aus Digest, Vol 70, Issue 4

The same pair? David Robertson Adelaide

On Mon, Aug 5th, 2019 at 1:30 AM, birding-aus-request@birding-aus.org wrote:

> Send Birding-Aus mailing list submissions to > birding-aus@birding-aus.org > > To subscribe or unsubscribe via the World Wide Web, visit > birding-aus.org/mailman/listinfo/birding-aus_birding-aus.org > or, via email, send a message with subject or body ‘help’ to > birding-aus-request@birding-aus.org > . . . → Read More: Birding-Aus Digest, Vol 70, Issue 4

A problem with Kowa telescopes

I purchased a Kowa 883 Spotting scope last year. It is excellent optically, but does have a problem which I think is worth alerting birders to. Both rubber lens caps fall off very easily and I noticed most times, but, eventually, I lost the one on the eye-piece. More seriously, . . . → Read More: A problem with Kowa telescopes

Horsefield Bronze Cuckoo Wilmington SA

Calling incessantly as they do from a dead tree. I remember the great Graham Pizzey saying once that having a dead branch on top of a tree is a good spot to see and attract birds of prey. Well, it was great for the Horsefields. first one for our garden here at Wilmington. The . . . → Read More: Horsefield Bronze Cuckoo Wilmington SA

Common Bronzewing

We have had a nesting pair of Common Bronzewings at Ocean Grove non-stop for 22 years. Edge of town overlooking Lake Connewarre.

Sent from my iPhone

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