Richard Turton

There are two things to be aware of with the LensTip tests of the Olympus 300mm f/4 that place limits on the measured resolution.  First, they are using a camera with a 12 MP sensor.  Second they ...

If you can live with the fixed focal length you will not find a better lens than the 300mm f/4.  The resolution of this lens exceeds that of the 20MP sensor at all apertures except wide open where ...

I have been using Lexar 1667X 128 GB cards for several years in various EM-1 models and an OM-1 with no failures.  These are rated 250/120 and were measured as 254/122 in two different card ...

Identical except for the name on the front.

Teleconverters are only worth using with very high quality lens whose resolution is limited by the sensor pixel density.  The 300mm f/4 satisfies this condition so the MC-14 produces better ...

I have been using the Olympus 300mm f/4 for birds and insects for several years.  I was recently able to borrow an Olympus 100-400 lens for comparison.  It was definitely more convenient to use, ...

Which shutter mode were you using?  The maximum rate for sequential modes is 20fps, measured as 19.7.  To get 25fps or 50fps you need to use SH2, which does not open and close the aperture to ...

My sequential frame rate measurements were done before the 90mm lens was available.  It may well be faster.  When doing my frame rate measurements I found that any operation requiring mechanical ...

OM-1 and other recent E-M1 cameras do focus bracketing at 12-13 frames per second maximum if the shutter speed allows.  It cannot be faster because the lens focus needs to be adjusted mechanically ...

For short bursts where card write speed has no effect, the frame rate depends on which features are active.  Anything that requires mechanical action like image stabilization, focusing, and ...

Raw files straight from the camera are not sharpened.  However, Olympus Workspace, Adobe Lightroom, and many other software packages apply some sharpening even when the level is set to zero.

The measurable aspects of raw IQ, namely Read Noise, Signal/Noise Ratio, and Dynamic Range are virtually identical for all the 20 megapixel E-M1's.  The Mark II appears to be better than the ...

This is the full uncropped frame, handheld with the OM-1 and 300mm f/4 lens.  Jupiter is the bright dot lower right. This is a 10X crop of Jupiter. The diameter is only 20 pixels but it still shows ...

Both cameras appear to have more or less the same shutter speed. Exposure Shift  Mk II  E-M1X 0                         1/30   1/30 -0.5                     1/40  1/50 +0.5                    1/20  ...

It is easy to get confused when trying to equalize the exposure between cameras, so I did some test shots to be sure I had it the right way around.  This is a comparison of the E-M1 Mk II and the ...

There is enough flexibility in the ISO standard that the manufacturers can set native ISO to whatever they like for marketing purposes. Olympus cameras have an EXIF tag called Sensor Calibration ...

Is this normal behaviour for wasps?

Since you have introduced the normally forbidden topic of measured resolution as an alternative to subjective evaluation, I will dare to add my own contribution.  My resolution measurements using ...

I got the 90mm macro hoping that it would be better than the 60mm for bugs, but it didn't make much difference.  I know this is not useful to you, but I find the 300mm f/4 to be better than either ...

You are correct.  I should have specified  that these graphs are calculated for Focus Differential=1, and step size is linearly proportional to Focus Differential.