Does it make sense to ask what is the size of a photon?
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Yes, it does make sense to ask, but the answer depends on what you mean by “size.” A photon is the quantum of the electromagnetic field. In the current understanding…
What excellent Sony A and E mount full frame manual focus zooms are there available?
For Sony A-mount full-frame (Minolta/Sony Alpha DSLR era) manual-focus zooms, the honest situation is a bit unusual: 👉 There are almost no native “manual-focus-only” full-frame zooms in A-mount. Most A-mount…
Testing UKRAA PicoMuon Muon Detector with 20,000mAh lithium ion battery pack and stay-on USB dongle (prevents power bank shutting down with low current draw)
18/6/2026: I started this 24 hours ago and the power bank still shows 4 bars of power – so I have shown that this setup will provide plenty of power…
First Light on LRO-H5 140cm Communications Dish 16/6/2026 @ 04:45 am
Hi Francesco & Jason, I am currently outside with the dawn chorus (bird song at dawn), as the Milky Way is (sort of) overhead at this time of the day.…
Reflective properties of metals relevant to dishes
From the book “Field Maxima Inside Habitable Structures Exposed to 2.45 GHz Plane Wave Radiation”:
What do you call the 3 or 4 stalks which hold the feed in place on radio dish?
The three stalks that hold the feed assembly in front of a radio dish are usually called feed support struts or feed support legs. Other terms you may encounter are:…
Brian Coleman on the dish F/D ratio that works best with his dual mode hydrogen line feed he gave me
Much work has been done on optimising feeds to illuminate a dish as efficiently as possible reducing spill over which on receive means the feed sees ground raising the system…
Brightest masers for amateurs to observe
From Eduard Mol 17/6/2026: Keep in mind masers are variable, so any list will be more of an indication. W49 is the best one to start out with, because it’s…
LRO-H5: Introducing a new hydrogen line radio telescope at Lichfield Radio Observatory
This is built around an 140cm ex-communications radio dish which used to adorn the side of an university physics department. It is paired with a Discovery Hydrogen Line feed and…
The brightest masers for amateur radio astronomers to observe
Keep in mind masers are variable, so any list will be more of an indication. W49 is the best one to start out with, because it’s consistently very bright and…