The Iris is beautifully round, closes to 1mm and has 14 blades; Here are some back of the envelope calculations, I would be interested to see if I have got them right. A 10x/0.25 objective has an effective aperture at 10x of m/2NA = 10/0.5 = f/20 with a 20μm CoC c, and 550nm wavelength λ,...

I can see that the thin objective adapters, screwing into the body of the iris housing, give a shorter distance between the objective and the iris than would be provided with the existing objective to m52 adapters. For use with infinity objectives and (non-M42-mounted) tube lenses, M42 macro reversi...

also one more think what Adapters can i use to mount this objective on a bellows ? By 'bellows' do you mean 'on a lens'? This is an infinity objective, it needs a tube lens. Assuming it has the same mount as the apo version then you would use an adapter from 26mm 36tpi (see FAQ ) to 52mm and then, ...

SFEAR wrote:@ enricosavazzi: so when looking in the objective i will see a IR

No, only if your camera is specially modified to remove the IR-blocking filter which sits in front of the sensor.

Hi, and welcome to the forum. Your logic seems to be clear. I think the flaw is that Nikon specifies the image circle to be 25mm while it is at least that and a good bit more. We know this because the objective can be used at lower magnifications (with a tube lens of lower focal length, down to 105 ...

SFEAR wrote:ok i did have some idea of what APO was but thanks for make it clear for me

A better description here - starts with defining two types of chromatic aberration and explains what apochromatic and achromatic mean.

ok i did have some idea of what APO was but thanks for make it clear for me im asking if i should get this Objective because i can get it for under $99.00 and if so i will only be using it to take photo what you guys think ? Should I? :?: If you can afford to risk $99 then you have a chance to end ...

The Mitutoyo M Plan APO NIR series is additionally designed to be apochromatic. This means that chromatic aberrations are corrected at two points in the specified spectrum. While agreeing in general with your post above - at three points, surely, for apochromatic. Two for achromatic. [Typo fixed by...

What sort of magnification range are you looking for? And what sort of budget?

Laurie, thanks for responding. I wasn't sure how long these aphids would sit still enough for a stack. And it would not have occurred to me to try and stack a live subject (with more than 2 or 3 shots, anyway). I can see a benefit of a live shot, the legs, antennae etc are in realistic positions. I ...

Wow - what sort of time span are you talking about from first to last photo of a stack?

OK: I want to take extreme closeups of insects. I have a Sigma SD14 DSLR (using Foveon technology). I also have a 105mm Macro lens (APS equivalent=158mm). I want to marry this lens to a microscope objective. I am thinking a Nikon 10x NA 0.25. Is my 105mm lens long enough to accommodate this microsc...

Brodie Foster wrote: It shows as $73.00 until I choose my country as Australia, it then shows S$118.26. Maybe the 'S' means it includes shipping, which would be expensive shipping but I have emailed them requesting a quote so I will see what they say.

Maybe it is AUD?

excellent

Fred, thanks for posting those. So, that would be a "no".