Alan WF

This is very good! Any idea why the woman taking the selfie has two phones? Regards,

I really like the photos of the bridge, especially the first one. Regards, Alan

Superb. Regards, Alan

This is a decoration on a banister at the Museo Nacional de Arte (MUNAL), one of my favorite buildings in the center of Mexico City, taken with a Canon New FD 28/2.8, one of my favorite lenses. Reg ...

Not all of them are good. I have a 19/3.8 that needs stopping down to f/8 to have remotely acceptable sharpness and CA in the corners even on APS-C and suffers terrible from veiling. It is by far ...

CK and Suave: It's okay to disagree about lenses, provided you can do so civilly. However, it's not okay to step over the line of civility. Thank you. Regards, Alan

Ah, yes, that's makes things more difficult. Regards, Alan

Black-Crowned Night Heron, known around here as a Pedrete corona negra or colloquially as a "perro del agua" (water dog). Sony a6000 with Canon New FD75-200mm f/4.5 at 200 mm, f/4.5, 1/320, and ...

Black-Crowned Night Heron, known around here as a Pedrete corona negra or colloquially as a "perro del agua" (water dog). Sony a6000 with Canon New FD75-200mm f/4.5 at 200 mm, f/4.5, 1/320, and ...

Eh? It's cumbersome to mount the first couple of times, but once you get the hang it is quick and natural: slight turn one way to engage the aperture lever and then fully turn the other way to ...

Nice reflections. I might have moved the other peppers and the pear our of the frame, to avoid distraction. Regards, Alan

This is good advice, but the one disadvantage of an EF adapter is that you can't mount FD lenses (which are fairly cheap and quite good) without losing infinity focus. But for lenses with longer ...

Today, we're celebrating independence in México. Here's a patriotic decoration I saw last week in a rather sombre setting; perhaps a simile for the state of the country. Sony a6000 with Canon New ...

Today, we're celebrating independence in México. Here's a patriotic decoration I saw last week in a rather sombre setting; perhaps a simile for the state of the country. Sony a6000 with Canon New ...

I'm happy with my Canon New FD 100/2.8. Respectable at f/2.8 and fine at f/4, compact and fairly light. I'm not sure if it's any better or worse than other similar lenses, though. Regards, Alan

Is it a color shift or simply a loss of saturation? In the 600 m shots, I see the reds, greens, and blue all becoming less saturated from f/3 to f/4. I could understand that as an increase in ...

That's one for printing, framing, and hanging. Are you using this with a FL/FD to EF glass adapter or just a plain adapter? Regards, Alan

Yes, I mean the diameter of the OOF PSF is 1%. However, I'm not sure that I agree that "being out of focus doesn't cause blur". To me, blur is anything that degrades the effective PSF in an image ...

How about, "blur is 1% of image height". Regards, Alan

Ah, this is interesting. In another reply, I talked about optical problems based on my experience in astronomy, but in astronomy we can often move the detector very close to the primary mirror. In ...