Building an LED Ring Light (part 1)

February 1st, 2010

After failing to find a reasonably priced LED ring light which does what I want, I have decided to build one myself. My electronics knowledge was never particularly good at school, so it should be fun!

My basic requirements are that it:

  1. Illuminates small (~5mm) to medium  (~2cm) sized insects without casting too many shadows
  2. Fits on different microscopes
  3. Is powered by a (rechargeable) battery

Additional requirements are:

  • The option to power it from the mains
  • The ability to dim the LEDs
  • Switch groups of LEDs on/off

I shall start with a basic prototype consisting of 8 white LEDs, potentially adding more and making the circuit more complex. It shouldn’t be too hard but I haven’t used a soldering iron for years!

Where can I buy a cheap LED ring light?

January 25th, 2010

At work (and soon at home) I will be taking many depth stacked insect images from both a microscope and using a macro lens. Whilst I have a ring flash for the camera, I need a constant light source for the microscope, so I’ve started thinking and searching for a cheap LED ring light. My target price is under £50.

I remember seeing some fluorescent and white LED ring lights at an entomological fair and thinking they were rather expensive. The cheapest ring lights were the fluorescent ones, costing about £30 each. The LED rings were more, costing over £50. A quick Google search brings up a ring light for a Marumi compact camera ring light for £40 (RRP £77.62!) which still seems expensive and I don’t know how it attaches or if it would fit a microscope. Further searching turns up some in-car lights which could be adapted and an  LED microscope light which does exactly what I want (AC power, adjustable lighting and thumb screws) but costs a mere £500 and is not for sale in the UK.

DIY Ring Light © fdecomite

DIY Ring Light © fdecomite

I am beginning to think I’ll need to build one… Any ideas?

Ant Anecdote & Summer Summary

September 17th, 2009

To begin the post I have a small entomological anecdote to share: Last summer I was told about a very small island in a Swedish lake. The island was not often visited but humans (or probably much other wildlife) because it was supposedly teeming with ants. Whilst I don’t know much about ants, this seemed a bit improbable and I wondered what they would eat.

This summer I had the opportunity to visit this island. The stories were true. My visit was brief and I should have worn different clothes. Being in a small rowing boat with ants in your pants is not fun!

I have never seen so many ants on almost anything. There were ants all over the ground, all the low vegetation and on the tree trunks.

Unfortunately, in my haste to leave I forgot to take any specimens. I would guess that they were a Formica species but would need to go back and confirm. Does anyone have some good suggestions for keeping ants at bay?

Anyway, autumn is definitely underway here. It’s dark when I get home from work, the leaves are changing colour and I have started packing my waterproof jacket for the inevitable rain.

My summer has been incredibly busy and that’s one of the poor reasons I have not written recently. The more important reason is due to changing jobs, where it matters more if I identify myself online, especially entomologically. Thankfully, I think I’ll have the latter reason resolved soon.

Entomologically, this summer has been action packed. I have been to many interesting sites and seen more new insects that any other year.

North Thames/Stanford-le-Hope Marshes

North Thames/Stanford-le-Hope Marshes - One of the more interesting sites which has a salt marsh area.

Soon my insect photo count will breach the 1,000 mark! I even managed to do a little insect hunting in Sweden and saw one of the world’s oldest tractors :)

Ferguson Tractor

Ferguson Tractor

In previous years I remember feeling somewhat sad when summer ended and the insect season was finishing. Right now I am looking forward to sorting out my insect records, investigating photographic metadata and catching up on some reading!

Thoughts on Entomology & Flickr

June 30th, 2009

I am a fan of Flickr and think it’s a wonderful place to store and tag photos. Recently I’ve been wondering about how useful Flickr is as an entomological resource and thought of a few questions:

  • How many new insect photos are being added daily?
  • How common are misidentifcations?
  • How many insect photographers add geographic data (geotags)?
  • What is the number of unique insects represented on Flickr?
  • How could Flickr be used in an insect-based meta-analysis?

As I wrote this there were (searching everyone’s uploads with no filter):

  • 839,123 results for ‘insect’
  • 28,014 results for ‘hemiptera’
  • 1,673 results for ‘pentatomidae’
  • 816 results for ‘palomena prasina’
Flickr map of Palomena prasina © Yahoo 2009

Flickr map of Palomena prasina © Yahoo 2009

I found that there have been around 1,000 extra hits for insect everyday in the past week and that searching for ‘palomena prasina on the Flickr map gave ~217 results (depending on the type of sort) which were spread around the UK, France, northern Spain, Germany, Finland, Belgium and the Netherlands.

As I browsed through general search results for the Palomena prasina photos, I saw a few that were obvious misidentifications. I think that misidentifications are probably the biggest limiting factor that would be hard to control if you wanted to use Flickr tags/information in an academic way. Whilst there are plenty of very knowledgeable Flickr entomologists, it’s hard to know which photos are identified correctly.

Whilst the map search was interesting, it wasn’t overly useful in it’s basic form. I think that a more sophisticated map search might be possible using of the Flickr API, but you would still be limited by the proportion of images that have geographic data.

Finally, everyone tags and organises their photos differently. I try and enter in as much information as I can without it being too long or bothersome. For an insect shot I try and include: country, county, area name, specific location (like the nature reserve), class, order, family and genus+species. By doing this I can search for particular insects in different areas quite easily. I started added a few six-figure grid references to the images, but as every specimen has a map location, this isn’t a priority for me.

I feel that Flickr could be used in a more powerful way and have a few ideas how, but I’ll save that for another post.

For now, why not check out some of the Flick insect groups? I’ve linked a few below:

Sinister Wingless Visitors

June 29th, 2009

I was in the kitchen late one night when something caught my eye. An insect of some sort quickly scuttled across the floor and hid in the darkness under a cupboard. From the brief look I got, I suspected that it was an odd looking hemipteran.

What was it?

What was it?

As I moved closer I saw it was rather drab and it retreated further, looking a little sinister.

Closer still, I got a proper look at its body and saw that it had really reduced wings and some vicious mouthparts.

Suddenly I starting thinking of sheep keds, Melophagus ovinus, the wingless blood sucking flies that are parasites of sheep. I decided that I didn’t really want to poke it with my fingers, so got a container, my copy of Chinery and a camera.

After flicking through the Diptera I found the section on the Hippoboscidae, the so called flat-flies. Looks like this particular one was, Crataerina hirundinis, a parasite of  martins and swallows. Although not confirmed, it made sense, as I think we have house martins, Delichon urbica, in the loft.

Hippoboscidae: Craeterina hirundinis

Hippoboscidae: Craeterina hirundinis

The Hippoboscidae are unusual because many have reduced wings and the females give birth to fully grown larvae rather than lay eggs.

I found a few more in the kitchen (now removed) but am uncertain how they got there. Even though I think they wouldn’t bite me, I feel uneasy walking around with bare feet!

Insect Hunting in Essex: The Chafford Gorges

June 14th, 2009

After two visits to the Rainham Marshes this year, I wanted to explore other local sites in Essex. The Chafford Gorges (owned by the Essex Wildlife Trust) are local to me and seemed interesting because of their flora and history. They are located in the the Chafford Hundred area which is mostly a modern housing development, and is adjacent to one of our huge regional shopping centres, Lakeside. The three gorges are all that remain of a much larger wild area that I remember from my childhood.

A shot of one of the nearby chalk pits (mostly filled with Birch)

A shot of one of the nearby chalk pits (mostly filled with Birch)

When I visited with Tristan I went to Grays Gorge and Lion Gorge. At Grays Gorge I saw my first wild British orchid, the common spotted orchid, Dactylorhiza fuchsii.

Common Spotted-orchid, Dactylorhiza fuchsii

Common Spotted-orchid, Dactylorhiza fuchsii

We were fortunate to meet the site warden whilst we explored, and hopefully I will be able to acquire some old records for insects in the area.

Somewhat anecdotally, I recall seeing glow worms, Lampyris noctiluca, on the nearby cliffs when I was younger but do not recall seeing them after a road was built nearby, which would have coincided with increased light in the area from both new houses and street lights. Perhaps this can be seen from the local records…

Some photos from the gorge area:

A lucky shot

A lucky shot

The rather attractive Cercopis vulnerata

The rather attractive Cercopis vulnerata

Rainham Marshes

May 18th, 2009

Earlier in May I visited Rainham Marshes with Tristan and Malin. This was my second visit to the marshes after previously visiting in March. We were fortunate to have a lovely sunny day and saw plenty of insects.

Rainham Marshes is nature reserve managed by the RSPB. It is located to the east of London and is fairly easy to travel to on the train (the nearest station is Purfleet, about 10 minutes walk away).

Rainham Marshes

Rainham Marshes

We mainly were hunting for insects, although we did see some interesting vertebrates too:

Water Vole, Arvicola amphibius

Water Vole, Arvicola amphibius

Marsh frog, Pelophylax ridibundus

Marsh frog, Pelophylax ridibundus

It was my first time hearing the marsh frogs and I thought it was quite nice to hear them, although they were very loud!

The invertebrate highlights included seeing my first lace bug (Hemiptera: Tingidae), bishop’s mitre (Aelia acuminata), woundwort shieldbug (Eysarcorus venustissimus), a cream-spot ladybird and a pair of Larinioides cornutus having what looked like a violent mating ritual.

Deadly embrace - Larinioides cornutus

Deadly embrace - Larinioides cornutus

Cream-spot ladybird (Calvia 14-guttata)

Cream-spot ladybird, Calvia 14-guttata

Bishops mitre (Aelia acuminata)

Bishop's mitre, Aelia acuminata

Digital Microscopy

May 10th, 2009

I am still investigating the different ways to take microscopic images and have some images and a different system to show you. Previously I had been looking at microscopes which came with a USB attachment such as the Summit Microfix Digital Microscope. I first read about it in a Phasmid Study Group newsletter and the author, Tracy Dove, has kindly given me permission to use some of her images.

Eurycantha calcarata egg taken by Summit Microfix Digital Microscope © Tracy Dove

Eurycantha calcarata egg taken by Summit Microfix Digital Microscope © Tracy Dove

Peruphasma schulteii head taken by Summit Microfix Digital Microscope © Tracy Dove

Peruphasma schulteii head taken by Summit Microfix Digital Microscope © Tracy Dove

Peruphasma schulteii eye taken by Summit Microfix Digital Microscope © Tracy Dove

Peruphasma schulteii eye taken by Summit Microfix Digital Microscope © Tracy Dove

These images were taken by hand, without a stand and without depth stacking. I think they are pretty good for a device which costs less than £40! The microscope does not come with a stand which would allow you to take images suitable for depth stacking, but it would probably be easy to make one.

The other system I found was ScopeTronix’ MaxView Plus, which allows you to use a digital camera with a variety of optical devices if they have the supported fittings. Whilst fairly costly at ~$300, the kit comes with multiple attachments, and ScopeTronix have a range of fittings for digital cameras. If you knew exactly which microscope adaptor you required, I think you could get it for a lot less than $300!

Bank Holiday Adventures

May 7th, 2009

I have had a busy past few days. I went insect hunting on Saturday and Sunday, spent a day taking cicada photos at the museum on Monday and had my MSc graduation ceremony on Wednesday.

On Saturday I met with Tristan to explore Rainham Marshes. This was the second time I had visited the marshes and unsurprisingly, they were much more lively than they were in March. I will write another post to cover what we saw at the marshes.

I spent Sunday at Imperial College’s Silwood Park campus with Malin and saw lots of hoverflies that I am yet to identify. We picked some nettles (Urtica dioica) to make nettle soup which was very tasty. We used a recipe from ‘Seaweed and Eat it: A Family Foraging and Cooking Adventure‘ by Fiona Houston and Xa Milne. I have not read any other wild food books for comparison, but it seems a reasonable book with anecdotes, history and folklore. We hope to try one of the seaweed recipes soon.

Finally, I wish to share a wonderful tool that Alan Phillips introduced me to: Grab a Grid Reference by Keith Balmer. If you do recording and need a quick site to look up grid references then this is the tool for you! It is easy to use and is much better than any other sites I have used (including the OS site). Thanks Alan!

Book Review: ‘Time: A User’s Guide’

April 29th, 2009

I have recently finished reading ‘Time: A User’s Guide‘ by Stefan Klein and thought I would share my views on the book.

The cover of this book caught my eye (but I cannot explain why!); a man is sunbathing on a field of grass which is overlooked by a large block of flats in the distance, set against a lovely blue sky with a few clouds. I picked it up and read a few sections (’When Sex is Best’, and ‘The Art of Cooking Goulash’) then promptly took it home.

The cover of 'Time: A User's Guide'.

The cover of 'Time: A User's Guide'.

The book covers various aspects of time and is written in an interesting and accessible way with plenty of good examples. I read the book with little prior knowledge about time and would say you do not need a good understanding of anything the book covers to appreciate it.

I would recommend the book if you want a general and accessible overview of time. It covers the physics, biology, psychology and sociology behind time with plenty of footnotes and references, and would be a good starting point for someone who wanted to study the topic further.

The book is divided into three main sections. The first, ‘Experiencing Time’, looks at time from a biological and psychological perspective. Numerous examples are used from daily life, such as how we experience time at different speeds (such as when bored and time seems to go slowly, or in a state of excitement when time seems to go quickly). At the end of the section, case studies of brain damaged patients are given to illustrate which areas of the brain are important for different components of time perception and what happens when they do not work (or are not present!).

A wrist watch

The second section, ‘Using Time’, compares the perception of time usage in different countries, and in the workplace and society. The section starts by looking at the role of time in hectic modern lifestyles and how our refined ability to measure time has changed both how we value and use time. The culture of constant communication is touched upon, alongside the effects on our brain and how we cope with a constant bombardment of stimuli, such as replying to instant messages, emails, texts, phone calls… This book was written before Twitter became really popular, but I am sure it would have been mentioned if it was!

The final section, ‘What Time Is’, begins with a brief history of the modern clock and moves into Einstein’s theory of relativity. It is the shortest section of the book but it contains some of the hardest ideas to understand.

The book concludes with some of the author’s ideas on how we can lead a more relaxed life by developing a different view of time. All of the suggestions seem sensible, the first of which I had been thinking about before reading the book! Whilst our society is composed of people with a variety of schedules and lifestyles, most public services and quite a few private services follow unwaveringly conservative schedules. Visiting my bank or the doctor usually means I need to get time off work (and I get home earlier than most people I know!). For parents, having access to good childcare would allow them to make better use of their time. Of the other suggestions, I remember a particular bit about cherry blossom:

…the major Christian holidays revolve around the birth of Jesus more than two thousand years ago and his resurrection into eternity. In Japan, by contrast, the appearance of the ephemeral cherry blossom is an event that creates a whirl of excitement throughout the nation. For the Japanese, the magic of this magnificence lies in its brevity - in a matter of days, the dazzling display is gone.

It made me think about how I look forward to seeing the first insect of spring and how many seasonal insect lifecycles I would see.

I enjoyed the book; it gave me plenty to think about and was a generally easy read.


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