Hamiltionian

In practice, I have found no difference in the the wall thickness of the carbon fiber tubing of tripods based on how many leg sections it has.  There probably should be, but no one actually does this.

(1) Is the small piece of carbon fiber on the leg joint functional or decorative? (2) Do you know what kind of carbon fiber ...

Oh man, I would absolutely love for every camera to have Arca rails built into the camera frame.  Not only would this be lighter and more compact than the existing camera + L bracket solution, but ...

I've been using two different plates, the Breakthrough Photography 85mm Arca Plate and the Desmond 85mm Acra Plate .  The Desmond is well made and does indeed work in RRS lever clamps, which was ...

Yeah, its a fantastic tripod and especially so for that price.  The Gtizo 4 & 5 series really take the meaning of rock solid to the next level.

I haven't tried the older Takumar one.  It is a much older design and doesn't include the ED glass, so reportedly chromatic aberration is a bit more of an issue.  If it is anything like the larger ...

Its the SMC Pentax-M* 67 400mm F4 ED [IF] , so yeah, that makes it the expensive version with ED glass and multi coating.

Yep, just trying to give an example of what kind of optical quality to expect.  It's the best high contrast subject I had readily available.

I recently picked up a copy of the Pentax 67 400mm F/4 ED lens for use with my GFX 50S and wanted to share my thoughts. Overall it is quite sharp given the age of the design. I haven't noticed much ...

I tried an Irix 15mm.  Used with the techart adapter, it would cause the camera software to crash every time I tried to mount it.  If you do try it, use a different adapter.

How did the X mount impact the development of IBIS?  I know Fuji has been very late to the IBIS game, but the stabilization in the X-H1 seems to be top notch.  Did something about the mount force ...

The Leofoto isn't a bad head, but the BH-40 is definitely better.  But yeah, I have serious reservations about a company that is willing to simply copy another straight up.  It is always possible ...

I've actually quite like the K-10X.  What didn't you like about it?  Or did you experience a problem?

So, the big advantage of mirrorless cameras is that they can place optical elements close to the sensor.  As an optical designer, placing optics closer to the sensor allows maximum freedom in lens ...

I've expressed some disappointment about the sharpness of the 100-200 at the long end of the zoom range, but it is still way sharper than my old Canon 70-200 F/4, which I considered a very sharp ...

I think its a bit of both.  Certainly the most benefit from mirrorless comes in the wide and ultrawide territory.  But the Fuji GF 23mm is also the heaviest wide angle lens I have owned, though it ...

I found that a top end mirrorless kit would often weight more than the equivalent SLR simply due to the size of the lenses.  When I shot the 5DS and Pentax 654Z, my overall kit stayed fairly light ...

Oh interesting, that's a new one to me.  Looks like they took the LS-324C and basically added a leg section, so yeah, it still isn't all that compact.  Gets up to 60" though.

Yep, the sensor on my GFX 50S was tilted by about 100 microns. There is the whole saga here: https://www.dpreview.com/forums/post/61372236 End result is that I fixed it by shimming the lens mount ...

I tried testing flat printed test charts for awhile.  I could never seem to get the camera lined up well enough to the chart to get meaningful results.  These days I will just use the Kasson star ...