Help judging performance of my FE55z, FE35f2.8z horizon/infinity

Started Jul 5, 2016 | Questions thread
l_d_allan
l_d_allan Veteran Member • Posts: 5,087
Re: Help judging performance of my FE55z, FE35f2.8z horizon/infinity

slstr wrote:

All my fe35 shots posted were indicated by camera as infinity during manual focus. Focused on big TV radio tower 5km away, even the FE55 has trouble on 24mp A7 sensor to show much detail at 5km.. Amazing how you can see the lines that stabilize the structure with both 35 and 55 leases.. You need shots focused further away than 5km?!

My speculation is you (and others) are encountering atmospheric issues ... heat, haze, smog, heat, humidity, heat, pollution, wind, heat ...

Did I mention heat? Variants of haze?

My impression is that Jim K. can get away with near-infinity tilted horizons because his situation in California has occasional times of sufficient dryness, low haze, low wind, and other factors ... and even then usually in the morning only before it heats up.

My situation is probably even better/clearer than JK's here on the Front Range of Colorado at 6500' altitude, but I am still leery of near-horizon targets for lens testing.

MTYEWTK ?
Early on clear mornings maybe 30 times a year, we have what the aviation weather service describes as "unlimited visibility". That corresponds to clearly visible avalanche chutes on the Spanish Peaks 100+ miles away (if I'm at my sunrise vantage point with 360 deg FOV).

I think the assumption that near-infinity horizons are acceptable for lens evaluation is an obsolete carry-over of the [bad] old days of film.

IIRC, A.A. relied on testing with trees on the horizon, and what I think he described as "infinite detail the closer you looked".

Maybe that was fine with the much lower demands placed on lenses back then. Now? Not so much?

I'm am hoping that much simpler de-centering tests turn out to be adequate to filter out almost all "bad copies" so the odious and error prone brick wall testing can be greatly reduced, if not relegated to irrelevance.

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