Appreciate that!

Thanks. Yeah, I saw it. I think all it does is round off the image rather than make it a true circular fisheye.

Thanks!

Thanks!

Thanks, Jeff!

Thanks. I wanted to compare my 9mm bodycap but I busted it a long time ago.

It's a fun lens!

7.5mm would be 15mm on m4/3. If you already have the 8-18mm, I don't think you need this lens.

@@RobTrek Thank you for such a quick reply Rob. I'll skip this lens.

I ended up ordering the 7Artisans 4mm F2.8 fisheye lens. I may not use it often, but at $108 US (EBay) it looks like a fun lens to creative experimentation. Thanks again for your advice.

Thanks. The 8-18mm is definitely nicer.

Thanks.

Focus peaking works well for longer focal lengths, like 25mm and higher. The lens also needs to be sharp. Softer lenses don't show the peaking color very well. On wide angle lenses, focus peaking is not much use, even if it's working.

That's because the big upgrade you're paying for in the Olympus is really its superior maximum aperture. If you review the higher apertures, you'll find very little difference for most people. That said, it's difficult to compare a Ford with a Ferrari. There are differences, but few will notice them

I know about the difference, When he compared in lightroom he said that the pictures where at the same f-stop, But TTArtisan pictures was only f/2.

Hi, Jan. Sorry for the confusion. The f/2 display for the ttartisan was a static value since the lens itself doesn't have electrical contacts to communicate what the actual f/stop was. However, I did match the f/stop values for comparison in the review.

@@RobTrek Thanks for upclaring my confusion. Super video!!

Thanks, Gary.

My pleasure 😊

The Nikon is probably the better choice as it's a rectilinear lens.

@@RobTrek Thanks Rob

A light pollution filter for this lens would be nice. I didn't notice any issues with color in general, but I do see what you mean in the sky. It might just be a slight exposure difference.

Glad I could help!

There is a newer version of the 7artisans 7.5mm f2.8 (TTArtisan only has this F2 Version). The new MkII Version of the 7Artisans has much improved optics in comparison to the older one (Hoya ED elements f.ex.)

I thought it stacked up pretty well considering the price!

The 12-40 is not really wide enough. You might consider the 9-18mm from Olympus. Using a fisheye is awkward for framing the shot. It's hard to tell if the lines are straight.

Interesting question. I just tried my 7artisans 50mm f/0.95 against my Oly 40-150mm kit lens at 50mm. It was spot on. I tried my Ziess 35mm Nikon F mount against my Oly 12-40mm pro and it was also spot on. So it seems my initial hypothesis of the TTartisan being made for APSC might be wrong.

Yes, exposure exactly matched my 8mm fisheye at f2.

Thank you again!

Yeah, the f/2 was a static setting since the lens doesn't have any electrical contacts.

Olympus and Panasonic have the lens profile info built into image files, so no need to create a separate profile in adobe. That said, DxO does provide their own lens profiles info for Olympus & Panasonic which I think are superior to the built in profiles.

Thank you. That all makes sense to me except for multiplying the focal length by the crop factor because the TTArtisans is an APS-C lens on an MFT mount. Taking a 20mm rectilinear lens made for APS-C gives me the same FoV as a 20mm rectilinear lens made for Full Frame when they are put on the same sensor. While the APS-C lens will usually have some vignetting and other issues, I don't think I would multiply the focal length of the lens by 1.5 when I put it on a full frame sensor. As for aspect ratio, wouldn't a 4x3 have a wider horizontal FoV than a 3x4, even though they could have the same crop factor? Hence my logic that a 3x2 would be wider than a 4x3. Obviously I'm not an lens designer and if you have the time would appreciate your feedback. Thanks again.

@@RobTrek Crop factor between APS=C and M43 is 1.333 (2/1.5) hence 7.5mm APS-C acts on a M43 sensor a bit like 10mm lens designed for M43. M43 sensors have different aspect ratios but their crop factor is calculated based on diagonal angle of view so if anything (all other things being equivalent) they would produce ever so sligtly narrower horizontal AoV than APS-C sensors, which have 3:2 aspect ratio. However the difference in angle of view on M43 sensor between 8mm fisheye lens designed for M43 and 7.5mm fisheye lens designed for APS-C but with M43 mount cannot be atributed to the difference in aspect ratios. That would not make such a huge difference. It is just that from the APS-C-sized image circle you crop only some portion - namely M43 portion being 1.333 times smaller. That is why with the M43 this TTArtisan lens would have only 150 deg (diagonal) AoV whereas most fisheye lenses are designed to have 180 deg diagonal AoV. Another aspect is the horizontal and vertical AoV. Cropping a fisheye image will have different effect on diagonal, horizontal and vertical AoV as fisheye lenses have especially high diagonal AoV compared to rectilinear lenses, while horizontal and vertical AoV are also higher but to a lesser extent. The last thing is that optically there is no such thing as fisheye lenses. There are stereographic fisheye lenses, equidistant fisheye lenses, orthographic fisheye lenses and equisolid angle fisheye lenses. They all have different projections and react differently to cropping. Olympus is the most popular equisolid angle fisheye lense, whereas this TTArtisan, as well as Samyang, Pergear, Risepray etc. happen to be stereographic fisheye lenses which produces most pleasing image projection with least distorted image (IMO best compromise between streching corners and bending sides for faces and sihlouettes). All this contributes to the difference between their AoV on M43 sensor, aspect ration being the least important factor.

@@przybylskipawel Thanks again Pawel. I'll read this again carefully and do some more research.

Focal length is focal length. A 7.5mm lens is a 7.5mm lens. You do not multiply or divide anything based on what format it was designed to cover.

I did give it a lot of slack, mostly do to the price. Unfortunately I can't test for other lens characteristics more precisely.