[jt_cph_dk]

I'm confused. I thought a 1degree spot meter was an absolute measurement covering 1 degree. The FOV of the spot meter is 1 degree - where did 37 degrees enter the picture?

Put another way. If I use a lensatic compass or a more accurate version and mark two points in the distance 1 degree apart the diameter of the area the meter covers should roughly be the same - right?

Thus a lens with a fov of X * 0.15 = 1 will give the answer to the fov needed of the lens to match the original question. (X = 1/.015 = 6.66 degrees) which is a very large telephoto on 6x7.

Thank´s for the help on the math. Your math bit corresponds with my illustration. Hand held 1° spot meter is 1°, but at some point (6.66°=6X7 600mm/6.7°) the image is enlarged so much, that the 15° spot on the AE finder meter equals the FOV as seen in the spot meter, that has a normal lens. The 37° is the degree of a ‘normal‘ (105 mm) on 6X7 and the hand held Pentax spot meters have a ‘normal‘ lens (as far I know?)—it could also be a 90 mm/42.5°?

---------- Post added 1st Feb 2017 at 09:32 AM ----------

It is a shame Pentax didn't incorporate OTF metering in the Pentax 67, there is a surprising amount of empty space around the mirror box in that chassis.

Im considering using my LX with a tele for it´s brilliant meter.

---------- Post added 1st Feb 2017 at 09:36 AM ----------

What is the reading with the Minolta meter?

I didn´t have the Minolta last year and I don´t think it would be precise enough on that distance to subject (200 meters in a restricted area, can´t enter—there is one other view to the nest and it is even more difficult)?

---------- Post added 1st Feb 2017 at 09:55 AM ----------

... this is the subject—not the surrounding trees:

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Last edited by jt_cph_dk; 02-01-2017 at 03:36 AM.

[jt_cph_dk]

On that day (as on many here in Denmark) it was a very dull, flat light and the pine with the nest on it is a solitary tree and is actually standing in a 25x25M clearing and with more bright light would stand out much more clearly, hopefully with the white tails and their chicks feeding or other activity.

---------- Post added 1st Feb 2017 at 11:09 AM ----------

(New knowledge) Note: At butkus site (http://www.cameramanuals.org/pentax_pdf/pentax_digital_spotmeter.pdf) the manual says, that the digital spot meter has a diagonal FOV (roughly equal to FF 85mm/24°) of 26°/horiz. 22°/vert. 14°=equal to that of a 6X7 165mm/diag. 24°

Meter range: Digital Spot Meter: EV1 to 20 (AE 67 Finder Meter has EV2 to EV21 at ISO 100 with f/2.4 lens. and the LX -6.5 to 20 EV).

[jt_cph_dk]

Page 27 in the Digital Spot Meter Manual (http://www.cameramanuals.org/pentax_pdf/pentax_digital_spotmeter.pdf) is interestingly pointing exactly to the question of this thread:



---------- Post added 1st Feb 2017 at 01:14 PM ----------

Added comparison to AE 67 15° spot:



... make your own conclusions.

[jt_cph_dk]

My conclusion to this question is, that with the AE 67 Finder Meter in spot metering mode, using the averaging method, I will not need a hand held 1° spot meter, when using a super-tele 400mm. or longer.

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Last edited by jt_cph_dk; 02-01-2017 at 11:30 PM.