Almost exactly a year ago, I wrote in this diary that I had bought a Lumix FZ200 camera as a lightweight companion to my hefty Nikon DSLR. There is no doubt that the FZ-series are excellent cameras, as evidenced by the many photos made using them that appear on this site, but the laws of physics set limits on what the small sensor can achieve. On the other hand, the electronic viewfinder demonstrated to me how a digital camera can dispense with the bulky and heavy mechanism associated with the mirror box of a DSLR.
So, I am now starting out on a new trial, with a mirror-less camera in the shape of an Olympus OM-D E-M5. I chose this model, not just for its small size and low weight but also for its ruggedised weather-proof construction, which is important for some of my other, non-butterfly, photographic activities.
A very significant difference is that the OM-D sensor has an area of 225 sq.mm, against only 28 sq.mm for the FZ200. The Olympus sensor even out-performs that in my ageing Nikon D300s, thanks to advances in technology , according to DxOmark tests: see
http://www.dxomark.com/Cameras/Compare/ ... 614#tabs-1
I've read several excellent reviews of the Olympus, so am hoping it will live up to my expectations. I bought mine as a kit with three lenses, which altogether weigh about 1kg, against 7.1 kg for my Nikon kit. Perhaps a photo is the best way to show the dramatic difference in size between the two cameras!
After a couple of days of initial familiarisation - and this is a rather complex camera, with almost every aspect of its operation 'customisable' through menu functions - I took it, yesterday (
April 29th) on my first trip, with a hope of seeing butterflies, to the 'Juniper Valley that I've mentioned in earlier diary entries.
On the 'walk in' I saw my first
Orange Tip of this year as he hurried past me along the path in relentless search for females! I was disappointed not to find any 'dingies' or 'grizzlies' in their favourite spots but my wife's sharp eyes spotted a
Green Hairstreak for me to get some practice with the OM-D.
I used the 40-150 lens (80-300, 35mm equivalent), so that I could 'keep my distance,' and took a collection of shots as it moved from one flower head to another. One feature on the camera that I liked was the easy access to the exposure compensation function, with direct viewing of its effect in the electronic finder. This allowed me to compensate for the brilliant iridescence of the wings as they shone in the bright sunshine.

- Aston Upthorpe Down - 29th May 2015
Olympus OM-D E-M5 with 40-150 lens - 1/2000s@f/11 ISO800

- Aston Upthorpe Down - 29th May 2015
Olympus OM-D E-M5 with 40-150 lens - 1/2500s@f/11 ISO800
There were also several Pyralid moths flying, so I took this shot of
Pyrausta nigrata with the Olympus

- Aston Upthorpe Down - 29th May 2015
Olympus OM-D E-M5 with 40-150 lens - 1/640s@f/9 ISO800
While walking back to the car, I saw a rather battered
Green-veined White. By then, I was using my Nikon, as I had been photographing some birds in flight, but I show this shot to demonstrate the advantages of spot metering, when photographing white butterflies. The indicated exposure in 'matrix' mode was 1/1000s @ f/8, whereas the spot meter, trained on the butterfly, indicated 1/3000 @ f/9.5, which has kept the detail in the wing veins.

- Aston Upthorpe Down - 29th May 2015
Nikon D300s with 300f4 lens + 1.4X TC - 1/3000s@f/9.5 ISO800
I have a lot to learn about the OM-D but my first impressions are that it can do an excellent job at a fraction of the weight and size of the Nikon.
Mike