[Luke Riding]

Staff note: This post may contain affiliate links, which means Pentax Forums may earn a small commission if a visitor clicks through and makes a purchase. If you would like to support the forum directly, you may also make a donation here.

---

The 28-45mm is a feat and a half though, I would have thought that a DA25mm would be easier to make, thus a little cheaper.

Like I have always said, the top shelf heavy lenses like the 28-45 should not need OS as they are for the most part a tripod use lens.

I personally think there should be a thought process involved in selecting which lenses get OS and have wider apertures.

I would like a 30 or 35mm f3.5 OS, 55mm f2.8 OS, 120mm f4 OS and maybe even a 250mm OS for traveling handheld, all lightweight. Then prime/zooms of 22mm, 28-45, 45-90, 90-180 all smaller apertures of f5.6, no OS and highly corrected and sharp from 5.6 onwards.

Different tools for different occasions and you would buy them all. You would have light 24-28mm, 45mm, 90mm, 200mm equivalent OS primes for travel and some strong zooms for tripod landscape work.

I second that. I have the 28-45 and it is ridiculous that it has OS. I just have to leave it at home when I'm hiking due to the extra weight! Bad move by Pentax

[Digitalis]

How could this lens, made many years ago for 645 film and redesign for new digital system, be the the prototype for FF?

The Zeiss Distagon 55mm f/1.4 Otus is technically a medium format lens, it has an abnormally large imaging circle for 35mm lens.

[ogl]

The Zeiss Distagon 55mm f/1.4 Otus is technically a medium format lens, it has an abnormally large imaging circle for 35mm lens.

Could this lens cover 56*41.5 mm?

[Zygonyx]

But there is the registery distance. ..

[D1N0]

The trend is bigger glass to be able to make F1.4 lenses that are sharp wide open. MF has bigger glass. so makes sense to look there. Ofcourse you cannot make a 1:1 copy because you need F1.4 and a shorter registry distance.

[filoxophy]

I second that. I have the 28-45 and it is ridiculous that it has OS. I just have to leave it at home when I'm hiking due to the extra weight! Bad move by Pentax

The merits of having SR in that lens aside, do you really think that it's the SR module that tips the scales?

[Digitalis]

Could this lens cover 56*41.5 mm?

it could cover 44X33 comfortably, I think. But of course there is the Medium format registration distance to be dealt with.

[Simen1]

The Otus image circle could be tested. All we need is a system camera with a shorter flange distance like Sony E mount and a shift adapter like this one. I don’t know what the purpose would be though, except theorizing.

[D1N0]

you can test an image circle by projecting it on a piece of graph paper.

[2351HD]

The merits of having SR in that lens aside, do you really think that it's the SR module that tips the scales?

Weight is an issue, sure, but really that it a tripod lens due to size and weight. If it could be made 5% better in image quality without the OS then we would all like that.

Like I said previously, OS on a system like 645 should be reserved for lighter prime lenses that you are likely to handhold, leaving the big heavy lenses for tripod work.

[filoxophy]

Like I said previously, OS on a system like 645 should be reserved for lighter prime lenses that you are likely to handhold, leaving the big heavy lenses for tripod work.

That does make sense.