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This lens is available from B&H and 'This item is noncancelable and nonreturnable'. My question: Are the threads the same as on a Sigma 180mm F2.8 EX DG OS HSM? I got varying answers from B&H. Sigma recommends extension tubes, which I tried and the increase in magnification is minimal.

Nice lens.

This lens arrived a couple days ago. I checked decentering first and it is very well centered. The focussing reminds me of a Zeiss 100mm Makro, which is to say, very nice.

I fully expected a thread for this lens. It is truly one of my favorites.

I am considering using this lens for astrophotography, so wide open resolution is critical. Is this a repurposed 24mm Art, except without the AF elements? Where may I find reviews?

Specifically 5D IV vs. R6 with the same lens. R6 images are ~17% smaller. Why?

Is this a good option for astro? https://kolarivision.com/product/canon-eos-rp-full-spectrum-uv-ir-camera-forensics-kit/

How good are Nisi circular filters? I have used only B + W up to this point. I wanted to try Breakthrough Photography filters, but Breakthrough Photography appears to have severe manufacturing problems in terms of long delays on most products. So how good are Nisi filters and Nisi customer...

the setup is a ST-E3-RT on a 5DIV and a 600EX-RT as a slave. Until recently, the 600EX-RT functioned perfectly as a remote shutter release. Now, it won't. I have changed batteries, followed the manual instructions repeatedly to no avail. The link light on the ST-E3-RT flickers red when the...

I am considering buying a R for close-ups, macro, landscape and astro. I see the exposure compensation is +/- 3 EV while for the 5DIV it is +/- 5 EV. Why?

I have dabbled in birding with my 70-200 + 1.4X TC and now I want more reach. It appears no 400mm or 500mm, f/5 or f/5.6 primes will be available any time soon, so I am considering these: EF 500mm f/4L IS EF 500mm f/4L IS II EF 400mm f/4 DO IS II EF 400mm f/2.8L IS I am not considering the EF...

I like this lens. It doesn't have focus shift and is quite sharp. Focusing is a pleasure. John

Several sharp lenses - Samyang 14mm XP, Samyang 50mm XP, Sigma 28mm Art and Sigma 40mm Art – have noticeable spherical aberration. I have the Samyang 14mm XP and Samyang 50mm XP, and I want the Samyang 35mm XP, but I hesitate because I suspect it will have this characteristic also. These are...

I expect there is a thread on this, but I could not locate it.

Do tilt-shift lenses work well with mirrorless + an adapter? Can the wider tilt-shift lenses be better designed for mirrorless?

Interesting. Since it appears that no lens manufacturer is inclined to offer an affordable 300, 400 or 500mm tele prime, I may get one of these.

I find the AF on this lens quite good.

Turk's Cap Lily.

This from B&H: Samyang XP 85mm f/1.2 Lens for Canon EF You Pay: $899.00 Rokinon SP 85mm f/1.2 Lens for Canon EF Price: $999.00 Instant Savings: -$350.00 You Pay: $649.00 $250 just to rebrand the lens? Or has Samyang upgraded this lens? Would any owner/renter of this lens care to comment on...

Should MTF charts supplied by different lens manufacturers be compared? I don't see why not, but I defer to more experienced photographers. Specifically, I want to buy a 50mm lens and when I compare the Samyang 1.2 to the Sigma Art, the Samyang looks very close.