J'avais lu sur un forum anglophone que le MS-Optics Apoqualia 28mm laissait rentrer la poussière dans l'appareil et qu'il fallait, dès lors, éviter son utilisation lors de certaines conditions... si on veut éviter de devoir nettoyer systématiquement son capteur.

Les propriétaires peuvent-ils confirmer ?

L'epaisseur de ces objectifs surprend au debut mais c'est que du plaisir apres.
Par contre je n'ai jamais lu qu le 28 laisser passer de la poussiere ca me parait bizarre.

Like most handmade items, this lens does require a degree of maintenance and attention that other modern optics never would. Since the lens has a classically open design in regards to the helical, it does breathe slightly as it is focused, meaning in a dusty setting, it has the definite potential to inhale particles into the camera.
After shooting this digitally on my Sony A7s for a week, the additional dust was noticeable, but I had been shooting in an abandoned aluminum foundry in northern Washington, where lovingly a local said: “This is where America makes its dust.”

The most troubling downside is one that is common to most Miyazaki lenses over time, and one that for the most part is easily avoidable with standard maintenance. Since this is a handmade lens, the parts aren’t necessarily as permanently sealed to one another as a standard production modern optic, meaning that pieces can loosen over time unless carefully tightened during regular cleanings. In the case of most Miyazaki lenses, the piece that sees the most loosening is somewhat hazardously, the bezel around the rear element.
The reason this is troubling is mainly that in the case of the element coming off altogether, it’s rattling around inside the body of a camera can cause serious and lasting damage to both lens and camera, leading to a truly annoying potential expense.

That being said, as long as the operator of this optic knows that this is a potential factor, a simple careful twist during a monthly cleaning should be enough to prevent the lens from shifting at all in use.

The nearest comps I can think of are:

- the Lux 75, which is similar speed and FL but much larger, heavier and more expensive. I love the draw though.

- the 77 limited (which is a little slower, much harder to focus accurately, the focus rings turns pentax way, and with adapter it weighs over 400g). I don't like the draw as much. But it's cheaper.

- the Lux 75 apo, which is way better corrected, a stop slower and designed to do something else entirely. I don't prefer it for portraits.

- there's the Sony 85s, but the GM is huge. The FE 85 is still quite a bit bulkier and heavier than the Sonnetar, and I don't like the draw near as much.

- I owned Contarex 85 f2 I really liked, but that's much heavier, as expensive and a stop slower. And hard to find copies in decent condition.

- I owned a CZJ 80 1.8, which I liked but the colors weren't up to CY-era zeiss, and the bokeh was only ok and it was bigger with adapter. Sharpness and size were fine by me.

This lens is terrifically small when you actually use it. And the draw wide open is gorgeous I think.

Par contre les apoqualia, j'en ai essayé plusieurs, et à part leur compacité et leur look, je n'ai pas été emballé par leur résultat comparé au Voigt que j'avais.

Bellamy Hunt alias Japan Camera Hunter les vend en direct, mais il prend une commission délirante. Franchement, ses prix sont n'importe nawak.

...we are aware of the issues with QC. We are an official Miyazaki retailer and take great care to check all lenses to make sure they are working as intended. We will not accept bad lenses from him and we push him very hard to work on his QC.
We also offer a 1 year warranty on all Miyazaki lenses to make sure you have the lens working properly at all times.

I already have 6 of Miyazaki's "creations" - and the 73/1.5 is also on its way to me.

Miyazaki's QC is indeed abysmal. And, unfortunately, it hasn't improved over time. Interestingly, some of his 'problem' lenses only need a couple of tiny extra screws on the internal part of the mount and some focus tweaking (he does it by eye...) to become fully reliable. I can only come to the conclusion that he's only interested in optical design, not in delivering actual working products...

BUT, he makes unique lenses - if weirdly designed.

FWIW, after a period of frustration/rejection, I have devised a few 'mitigating strategies' to keep using these lenses. These involve buying used (as long as the previous owner has already had the lens adjusted) or only from reliable dealers (ie, not on eBay), ensuring that they check the construction and proper focus of the lens before shipping and, as a last resort, sending it to a competent specialist for further adjustment. I appreciate that this should NOT happen, and that it is entirely unacceptable from a customer's viewpoint, but I live with the irrationality because I'm a fool who (a) values the artisan work of a bigger fool and (b) finds these lenses both challenging and fun to use.