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11
Introductions / Re: Back after nearly 4 years in sunny Wigan.
« Last post by doug on Dec 10, 2017, 10:35:02 »
     Glad your are back Brian. Is it a permanent return now?

     Doug.
12
Introductions / Re: Back after nearly 4 years in sunny Wigan.
« Last post by Carole on Dec 09, 2017, 21:45:16 »
Hi Brian,

Welcome to the forum, and of course welcome back from Wigan.  Looking forward to seeing you at a future DSC.

Carole
13
Chat / Re: SD card sectors
« Last post by Mac on Dec 09, 2017, 19:21:26 »
By sectors im assuming you have folders named 100,101,102.

These are normally created by the camera when they reach a certain number and the images just roll over into the appropriate folder.

If you are saying the card is full you have a choice of 2 options.
1) the card is full
2) the card is faulty.

assuming 1) to be true, then you just need to copy over all of your photos from the camera, they should be in one of those folders.
If the folders are empty then it might be that what ever is on the card is hidden, in which case put the card into a PC and have a look for hidden folders / images.

Copy over everything to your pc
once you are happy that you have ALL the photos on the pc, check and recheck that they are on the PC....

then format the card IN THE PC.

That way if there are any faulty sections on the card the PC should be able to find and sort them out.
then put the card into the camera and REFORMAT it in the camera.
You will probably find the following to be true as well.

If you reset the camera a new folder is created.

It might be that you have copied over previous photos but forgot to delete them from the card.

If 2 is the case then do the same, move the card to the PC , copy over everything and see if the PC can sort out the memory card.

Pg 79.Users Manual
http://gdlp01.c-wss.com/gds/0/0300002580/02/eos7d-im2-en.pdf

Mac
14
Introductions / Back after nearly 4 years in sunny Wigan.
« Last post by Brian on Dec 09, 2017, 18:40:45 »
Hi all,
At last have a working password.  I notice that the next meeting is on the maximum of the Geminids! Perhaps we can see a few afterwards if clear.
Best wishes from Brian W.
15
Chat / Re: SD card sectors
« Last post by Fay on Dec 07, 2017, 12:50:51 »
https://www.cameramemoryspeed.com/canon-7d-mark-ii/fastest-sd-cf-card-comparison/

sent this interesting article on SD and CF cards for the 7D MK II

Fay
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[BAA-ebulletin 00995] A GREAT YEAR FOR THE GEMINIDS!
(c) 2017 British Astronomical Association    http://www.britastro.org/

Active from December 6-17, but with a slow rise to maximum, the Geminids are currently the richest of the regular annual meteor showers, producing an abundance of bright meteors, with rates outstripping those of the August Perseids for a 24-hour interval centred on their 14 December maximum - a real treat for observers prepared to brave the early winter winds, cold and damp.

The other good news is that Geminid maximum this year occurs just before new Moon, so there will be no interference by moonlight, enabling many fainter meteors to be seen in addition to the brightest members of the shower.  This year, the time of Geminid maximum is especially favourable for observers in Europe, with peak activity expected at about 02h on Thursday, December 14, when the ZHR may again reach 100 to 120 meteors per hour.

Observers should also note the most interesting project being organised by Dr Tony Cook of the BAA Lunar Section to capture video of lunar impact flashes as Geminid meteoroids strike the lunar surface on the eastern night side. See the BAA website for further details.

In recent years, from the UK, the Geminids have shown typical peak observed rates of 70-80 meteors per hour in good skies, so this is what one might expect on the peak night of December 13/14 (Wednesday night/Thursday morning). The maximum is quite broad, however, and respectable Geminid rates may be expected throughout the nights of December 12/13, 13/14 and 14/15.  Past observations have shown that bright Geminids become more numerous some hours after the rates have peaked, a consequence of particle-sorting in the meteoroid stream.

The Geminid shower radiant (at RA 07h 33m,  Dec +32o, just north of the first magnitude star Castor) rises early in the evening and reaches a respectable elevation above the horizon (> 40o) well before midnight, so observers who are unable to stay up late can still contribute very useful watches. However, the early morning hours of Thursday, 14th December are likely to see the greatest Geminid activity, when the radiant is high in the sky.

As with any meteor shower, when observing the Geminids it is best to look at an altitude of 50o (about the same altitude as the Pole Star from southern parts of the UK) and 40-50o to either side of shower radiant, rather than looking directly at the radiant itself, although Geminid meteors may appear in any part of the sky. December nights can be quite chilly, especially in the early morning hours, so wrap up well with plenty of layers of warm, dry clothing and make sure that you wear a hat, gloves, thick socks and sensible waterproof footwear.

Geminid meteors enter the atmosphere at a relatively slow 35 kilometres per second, and thanks to their robust (presumably more rocky than dusty) nature tend to last longer than most in luminous flight. Unlike swift Perseid or Orionid meteors, which last only a couple of tenths of a second, Geminids may be visible for a second or longer, sometimes appearing to fragment into a train of 'blobs'. Their low speed and abundance of bright events makes the Geminids a prime target for imaging.

The Geminid shower has grown in intensity over the past 50 years as a result of the stream orbit being dragged gradually outwards across that of the Earth. A consequence is that we currently encounter the most densely-populated parts of the stream. This happy situation is unfortunately only temporary - in a few more decades, Geminid displays can be expected to diminish in intensity. Here we have an excellent opportunity to follow, year on year, the evolution of a meteoroid stream.

The BAA's visual meteor report forms, available as downloads in both pdf and Excel formats, enable observers to record the details of each meteor seen. These include: time of appearance (UT); apparent magnitude (brightness); type (shower member, or random, 'background' sporadic); constellation in which seen; presence and duration of any persistent train. Other notes may mention flaring or fragmentation in flight, or marked colour. Watches should ideally be of an hour's duration or longer (in multiples of 30 minutes).

Observers are reminded to carefully record the observing conditions and the stellar limiting magnitude. Wrap up warmly and enjoy what should be a great show!

By whatever means you observe the Geminids this year, please submit your results to the BAA Meteor Section via meteor at britastro org.

This e-bulletin issued by:

Dr John Mason
Director, BAA Meteor Section
7th December 2017
17
Chat / SD card sectors
« Last post by Fay on Dec 06, 2017, 17:04:00 »
Does anyone know the answer to this please.

I have SD card in the canon 7D, it seems to have sectors, 100,101, and 102. now 101 and 102 are full, but no images on 101.

Is this right?

Thanks

Fay
18
In the Media... / Re: Light pollution: Night being lost in many countries
« Last post by Rick on Dec 06, 2017, 16:31:45 »
The catch with tropical skies is that the air tends to be active, so the seeing isn't often great. In Kenya, for good skies you need to visit higher altitudes. Find yourself somewhere at seven or eight thousand feet above sea level at the right time of year, and the skies will be crystal clear. Trouble is, most times of year are wrong. If it's too hot and dry then the skies are full of dust. If it's the rainy season then the skies are full of cloud. However, one advantage of being close to the equator is that at some point in the year you can see almost every part of the sky...

Islands in the ocean can be good, but to be great they really also need to be high enough.
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In the Media... / Re: Light pollution: Night being lost in many countries
« Last post by Apophis on Dec 06, 2017, 16:26:08 »
Mostly the best skies are on islands surrounded by water , as in the desert the heat of the day makes viewing hazy as it rises from the land during night , hence any big telescopes that are in desert IE Atacama are way up away from ground level, you actually need Oxygen masks there.
Roger
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In the Media... / Re: Light pollution: Night being lost in many countries
« Last post by Carole on Dec 06, 2017, 11:22:22 »
I have been to Africa three times, Gambia, Kenya and Egypt.

In the Gambia the sky was disappointingly hazy, Kenya I was in the Masai Mara and don't recall the skies being much to look at there, on the Nile there were too many lights, the only place that was stunningly clear was in the Desert on the way to Abu Simbel, and I could only see the stars through the window of the coach I was on.  Since we had to be escorted by Armed Guard, there was no opportunity of getting out to take a look.

Carole
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