Ed Mann

Be afraid, be very afraid!!! – Baader 8-24 Zoom lens stripdown

Hi folks

Some of you may remember that I picked up a Baader 8-24 zoom lens from Astrofest a couple of years ago for £60. It was complete but the mechanism was a bit crunchy and sticking. Eventually it packed up completely. This left me with two choices, abandon it, or to attempt a very complicated and almost impossible rebuild.

Anyone who knows me would guess that I went for the second option!! So, heart in mouth, I went for it

I would immediately stress that, unless you are very technical, or completely mad (like me), **** DO NOT ATTEMPT THIS ****. There are lots of tiny screws, lenses and spacers and plenty of grease.

The problem I found was that there are three rollers/ guides that run in a helical groove. See the screwhead to the left of the 20 in the first picture. If you look at the second picture you can see there is no roller. The screw of that, and the third roller , had sheared. These screws are tiny M1.8 x 4mm screws.

This is where the fun part/ insanity started, as I had to either extract the sheared screws or drill them out with a 1.3mm drill. It wasn’t possible to extract them so I had do some very nervous and careful drilling. This also involved a complete stripdown to clean everything. I mentioned plenty of grease … it was everywhere!!!

I gave everything a good clean and (eventually) got it all back together, and IT WORKED!! Yayyyy . I now have two working zoom lenses

Manual HDR post-processing of astro images

HI Folks,

At IAS this year, Paddy Gilliand gave a fantastic talk on picture processing. He showed an example where the original image looks virtually washed out. By careful splitting of the image into different exposures, he managed to recreate something that I think is pretty damn good.

Look at the section on Manual HDR. It looks like a good process, and very effective. The link to the slides is below:-

IAS 2017 V1.2

Cheers

International Astronomy Show Day 2

Damian and I arrived at 09:15 at Stoneleigh Park south of Coventry for day 2 of the International Astronomy Show (IAS). We arrived at the same time as Terry and met Ed as we went around. Damian’s enthusiasm was infectious and we enjoyed a fantastic day in which we went to every store and explored every nock and cranny! We spoke to exhibitors, learnt about new products, discussed advances in amateur astronomy and the problems of selling astro equipment in a post-Brexit, poorer UK. I learnt some important information from Gary Palmer on using my Daystar Calcium Quark filter, we saw mounts with direct drives, large beautiful mounts that could be assembled and dissembled in < 3 minutes (each of assembly or disassembly), large scopes, small scopes, filters, power supplies, solar scopes, observatory automation equipment, observatory domes, mounting accessories, flat field plates, telescope storage bags, astronomy art, remote observatory rental companies, astronomy holidays, local astronomy societies, history of astronomy, second hand books, binoculars, more binoculars, bigger binoculars, enormous binoculars, refractors, reflectors, Cassegrains, Dobsonians, cameras – tony, larger, and enormous, connecting leads, dew heaters and bands, eyepieces, filter changers, eyepiece turrets, finder scopes, and even a microscope, amongst others. There was so much to see that Damian and I never got to see a lecture today!

Terry made up his mind and purchased an absolute bargain of a scope – a Sky-Watcher AZ-EQ5 and Sky-Watcher 80 ED scope with all necessary accessories – I think he found the bargain of the show! Well done to him and to everyone who found what they wanted or just enjoyed the day!

In the evening many members of RAG enjoyed a fantastic meal at Pizza by Goli in Lichfield.

Click on this link to download documents from the show (copy of the conference brochure with speaker information, vendor’s address cards and information about products)

Andy

Thanks to Ed Mann for the panoramas – other photos taken by myself or Damian:

 

SONY DSC

SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC

 

 

 

SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC

International Astronomy Show 2017 Day 1

Back again at Stoneleigh Park near Coventry, this show provides a relatively local chance to listen to some excellent talks and go to stands from virtually every astronomy retailer in the UK. Much cheaper than Astrofest in London due to not needing to book hotels or train tickets.

Today, Peter Hill, Ed, Terry, Paul Simpkins and Pete Simpkin and myself arrived early to get the most out of the day.

Terry was attracted to a discounted Celestron Nextar 8 but we needed to wait and see if he buys it! He then expressed ibterest in a Donsonian mount with digital setting circles. He is keen to find an effective useful GOTO scope for hinself to use.

For myself I purchased a small meteorite as demonstrator for my talks on meteorite petrology and microscopy – I don’t intend to get into meteorite collecting. Financial ruin lies that way!

I also bought a book for a fiver, but nothing else has taken my fancy so far. Let’s hope it stays that way.

The talks differ from Astrofest in that at IAS they are 1 hour in length rather than the Astrofest 30 ninutes. This alllows much nore detailsd exploration of a topic. For me, this is one of the particularly positive aspects of IS. The first talk on the sun was excelkent. Starting simply, it built up to in-depth discussion on composition of Sun as found by spectroscopy. Brilliant stuff. Other talks turned out to be equally as good. Terry, Peter, Ed and I also attended talks on dark matter.

Stands are really interesting – even if I am not in buying mood. I enclose some photos below.

Andy

SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC

SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC
SONY DSC

Rosliston Science Discovery Day 7/10/2017

Thanks to Peter (Hill), Ed, Bob, Roger, Geoff, Terry, Heather and Damian, who along with myself talked to 50+ members of the public about astronomy at the science discovery day today at Rosliston Forestry Centre.

The weather remained dry although persistent cloud meant that solar observing was limited to a few precious moments in the first hour. I ought along my LOMO polarising microscope and folks were excited to look at the birefrigement colour patterns on meteor thin microscope sections and at microfossils in thin sections of fossil-containing rock. Problems with my power inverter left my laptop out of action but Ed’s battery saved the day for the microscope illuminator so that the public could continue to look through the microscope!

Andy

 

The picture below was taken today through the LOMO microscope using my Bresser MikrOkular camera – it shows microfossils in rock thin section. Birefringence in the crystals of minerals in the fossil-bearing rock is evident:

Federation of Astronomical Societies Annual Convention 2017

Ed and I are here in Birmingham University for the GAS annual convention. This is the first time I have been here after Dave gave such a good write-up of the meeting last year. At only  £5 it is also one of the cheapest astronomical conferences you can go to – and local to us in Staffordshire and Derbyshire too.

There are around 100-150 attendees from a range of Astronomic3al Societies that are members of FAS. The talks are excellent from a range of highly qualified university based astronomy departments. Lots of professors! This makes it quite a different animal from other astronomical conferences for amateurs which tend to use either amateur astronomy lecturers or more junior departmental staff. It therefiee compliments those events well. The current prestigious bunch tend to drop in interesting bits of information that I had heard of before – such as the problem of light scatter experienced by GAIA. The talks today were theoretical and about astronomical research rather than practical astronomy. If Horizon and BBC’s Sky at Night TV does not stretch you ant more then you could have found something here to stimulate your astronomy taste buds. However these talks might have been too much for beginners unless you know a lot of physics and were certainly not aimed at children.

Well worth attending. I hope these events will continue. We will find out at AGM this afternoon – as there is a possibility the organisation might have to close due to lack of volunteers for senior positions within it.

Ed busily collected contact information from many of the lecturers during the day – many of them would make great speakers for future RAG meetings and do give such talks.

Andy

 

The programme for the day:

This picture shows me sitting in the lecture theatre:

Professor John Zarnecki discusses the future of Europe in space:

Professor Ian Shipley speaking about what happened next after Higg’s bosun was discovered. By this he meant the role of the Large Synoptic Survey Telescope when it is built (LSST):

Professor Tim Greenshaw talked about the Cherenkov Telescope Array:

Professor Donald Kurtz speaking about planets and pulsations: this was about astroseismology.

Professor Carl D. Murray gave the final talk reflecting on Casini mission to Saturn:

Pictures from the convention outside the talks:

   

Some impressive kit could be seen in the break. This isn’t a conference with many vendors but this new diagonal has a lovely magnetically held filter slider that therefore does not fall out unlike some competitors. I can imagine this being highly sort after by amateurs if priced right. Or at least it would be great if the manufacturer added a brass compression ring and not just two thin screws to drill holes through your Ethos eyepiece! The large eyepiece changer does have compression rings and us therefore better designed in this respect.

 

RAG First informal Star Party 23-25th September 2017

Hi Folks

Last weekend, Dave Jones, Pete Simkins, Paul Simkin and I went to the Brow Farm campsite near Church Stretton to try out an informal Star Weekend. Heather and Doreen were also there for the Friday night. The second photo shows the view from SE to SW  from the higher part of the site

Pete and Paul arrived on Thursday and had quite a good night’s observing. Unfortunately the rest of the weekend was pretty cloudy and rained some of the time. At least my tent didn’t leak this time as it did at Solarsphere.

Saturday brightened up quite a bit and we all got out our solar setups for a while, until hazy cloud made us give up again. At least we all saw a very nice sunspot for a while

On the Friday night, we all met up with Roy and Peter from the Shropshire Astronomy Society and all had a very pleasant meal and a few pints at the local pub. They invited us to go and see a talk by Pete Williamson at their meeting on Saturday night. It was a very interesting evening and the talk was excellent

Brow Farm is potentially a very good venue with minimal light pollution. There is a flat area with electric hook-ups and a hillside with 3 camping pods. There is also a separate field that is usually used by parties. If we wanted to set up a larger gathering it would be ideal as it is flat and has good visibility all round. It also has an empty caravan that could potentially be used as a presentation room/ meeting place if the owner allowed it

The campsite is less than an hour and a half from most of the RAG members and is very cheap, at £6 per head (plus £5 for electric if required) per night

Great weekend in all and I thoroughly enjoyed it