Oly 40-150 2.8 w/1.4x extender vs. Panasonic 100-400

I'm having trouble seeing the difference, as well.

Perhaps because you didn't post anything to look at.

I meant my lens samples.

abe4652 wrote:

I meant my lens samples.

That was clear but if you want people to make statements about your lenses you better upload some sample and give some details about how you compared the lenses

More in general I do not see  any  visible difference in quality  between these two lenses in the 140-210mm range. They are both very good.

So if both your lenses deliver good results there is nothing strange. If not better to post some picture to get some advise.

Stefano

drj3 wrote:

abe4652 wrote:

I am comparing IQ at overlapping focal lengths, on a EM1 Mark 2, and am having a lot of trouble seeing a difference, even with pixel peeping to the max.

Are my samples unusual, or do others have similar experiences?

I would expect a zoom lens with a TC14 to lose a considerable amount of resolution, so I would be somewhat surprised if the 100-400 were not somewhat better in the overlapping focal lengths. How are they between 100-150 without the TC14 on the 40-150?

TC doesn't always drop resolution a much. There are some Nikon converters that has excellent output by specs. The Olympus I have doesn't drop the IQ that you could pixel peep. Instead you will get the extended range with better IQ than cropping.

By specs the image circle is cropped and enlarged by the magnification ratio (1.4x, 1.7x or 2x) so the resolution should drop by the same amount. But when lens is already better than the sensor can capture by its output, you can enlarge the image circle more. After all the 1.4x is like going from a 16Mpix to 22Mpix so around 15% increase in resolution.

And if you think that 40-150mm is limited by 16Mpix sensor or 20Mpix sensor and can't be used with 24Mpix sensor, then....

The only reason I have the 40-150 f/2.8 and the MC-14 is because it's brighter, and it's weather sealed, I wasn't convinced that it had an extraordinary advantage in other respects. I get the impression that a lot of the lenses covering this zoom range are pretty good.