Guess again....

The advice about polarisers started in the era of AF film cameras, and became the "received wisdom" that passed onto DSLR users.

It seems it may well not be true any more.

Ken, I think we now all have spots before our eyes....it's very close.

So who can tell me what book cover this is? I'll give you a clue - it's the back cover, bottom left.

There's no substitute for trying these things out for ourselves. I've always been disappointed with converters and wondered how the Pentax ones would perform. However, the price has always been high and well out of reach.

This test so far has been a bit severe, using the prime lens (albeit a good one) at open aperture. There is every likelihood that at smaller apertures the performance would be much better.

So far what it does show is a slight loss of contrast, hence the lower colour saturation. As George points out, this could be adjusted further. When we look at the image at greater magnifications there is not that much difference in actual resolution, far less than I thought there would be and quite impressive.

The next test will be in the field - back to Martin Mere perhaps - where our 300mm lenses will become 600mm, or a very long 900mm-equivalent on digital. How this will suit us for wildlife is really the point, but this won't be tested out soon because of other commitments.

A further test shooting on film is also needed, as with colour slides there is potentially a real value in shooting distant objects. Not so easy to blow up a colour slide...not without negating its advantages anyway.

Work in progress.

Hi and welcome!

Some preliminary test shots with the SMC Pentax-FA 100mm f2.8 Macro at f2.8, first one without and second on with the SMC Pentax T6-2X Converter. The first image is cropped in Photoshop to show the same image as the second one which is uncropped.
[IMG]http://i240.photobucket.com/albums/ff250/johnriley1uk/001Pentax100mmCropped.jpg[/IMG]
[IMG]http://i240.photobucket.com/albums/ff250/johnriley1uk/002Pentax100mm2x.jpg[/IMG]

Is that you on the boat George, photoshopped in? If not, then there's a task for a quiet afternoon. Especially as I find your Avatar rather hard to believe....

"Centre weighted" Stefan.

[IMG]http://i240.photobucket.com/albums/ff250/johnriley1uk/042-The-Music-of-Flowers.jpg[/IMG]
From the Southport Flower Show a couple of years ago.

It's peaceful.....