While we're waiting to hear from Mr Wadman, here are a few more thoughts.
With respect to the two photographs of the same 109F, you say because we know the date and place the photographs were taken we can say RLM 74/75 was on the wings. In other words, because the documentary record tells us that RLM 74/75 should be on the wings at that time and place, we can be confident the colours were 74/75, despite what the colours might suggest in the second photograph.
I would agree entirely. So then why do you believe an apparently undocumented colour combination of RLM 02/71 was used on the wings of 109Es in 1940?
Regarding the colour accuracy or reliability of period colour photographs, of course there are some photographs that for a variety of reasons may give a misleading impression of the original colours of their subjects. Strong sunlight shining directly on an object, for example, can alter the appearance of the colour of that object. Take for example this period colour photograph of a Spitfire and see how direct sunlight on the green to the upper right of the roundel has made the original colour almost unrecognizable.
Great colour photos showing Spitfires being rearmed England 03
For this reason, of course we need to be wary of relying on a single period colour photograph as evidence of an officially designated colour scheme. However, when photograph after photograph of 109Es appear to show (to my eyes at least) a two tone grey splinter pattern and not an olive grey (02) /dark green (71) splinter pattern, I think we are on surer ground to start questioning the existence of the latter.
As such, for all their limitations, period colour photographs may still play a role as evidence in this debate. I certainly wouldn't describe their use as "pointless".
Take for example this excellent series of period colour photographs presented by the IWM. While I wouldn't suggest using them as precise colour-matching reference sources, the colours certainly look to be in the right ballpark. The army uniforms look khaki, while the camouflage colours on that Sea Hurricane (pic no. 10) look spot on. So let's not despair of period colour photographs entirely.
22 Amazing Colour Photos Of The Second World War
Regarding the "drawing of new conclusions without pointing to new facts to support a revision to commonly held beliefs", all I'm asking for is evidence of the widely claimed 02/71 splinter pattern colour combination (as is our friend, "The Brushpainter"). So far, I haven't been able to find any evidence of a 02/71 scheme, although as I presented earlier there appears to be compelling evidence to suggest the use of the 74/75 combination instead during the period in question.
So the onus of proof here is not on me. I'm the one asking for proof of the widely prevalent and published assertion that the top-surface splinter pattern colour combination on German fighters from the winter of 1939/40 to at least July 1940 was either 70/02 or 71/02.
It is suggested above that "there is also evidence, both visual (from photo interpretation) and written (from crash reports, descriptions and surviving relics) that another colour was used, in combination with RLM 71 that has come to be referred to as 'RLM 02'". Well, as I say, if you can point to any such evidence, I'm all ears. The 71/02 combination appears to be based on nothing more than the interpretation of black and white photographs. To re-quote Alain Fleuret:
"No substantiation, however, has been offered for the use of colour 70 (which may equally have been 71) and the assumption appears to depend entirely on the interpretation of black and white photographs, a risky area in which to be so dogmatic as it is such a highly subjective one. As any official orders approving this scheme have yet to be produced, the claim of the existence of such orders must for the moment remain a rather dubious one". (See Alain Fleuret, "Luftwaffe Camouflage 1935-40", 1981, Page 101)
Certainly a greater contrast is noticeable in the splinter pattern on fighters in black and white photographs of 109s from the winter of 1939/40 onwards. However, as I've already suggested, an identical contrast is noticeable in black and white photographs of the 74/75 scheme, so there is no need to invent an apparently undocumented scheme like 02/71 or 02/70 to explain that contrast. As Occam's razor suggests, "when presented with competing hypotheses to solve a problem, one should select the solution with the fewest assumptions".
Occam's razor - Wikipedia
From the comments posted above, it seems that we're already in agreement that two-tone greys were used at least from mid-1940 onwards, so why hold onto the notion of an undocumented 02/71 scheme? What seems more plausible and to have the least assumptions: the Germans went from 70/71 to 02/71 to 74/75 within a six-month period or they went straight from 70/71 to 74/75 (both of which, unlike 02/71, are well documented official colour combinations)?
Besides, while the 74/75 scheme is mentioned in the reissue of L.Dv.521/1 and 2 in November 1941, there is documentary evidence of its existence earlier than that:
"An RLM order, dated June 24, 1941, is believed to have ratified the changeover to an official RLM camouflage scheme incorporating the new colors 74, 75 and 76 in conjunction with 65. By August 15, 1941, Messerschmitt had set forth its new painting chart for the Bf 109 F calling for camouflage colors 74/75/76 with a fuselage mottle of 02/70/74". (See page 24, The official Monogram Painting Guide to German Aircraft 1933-1945)
Even more to the point, the Brushpainter has recently posted on his website this fascinating quote from Thomas Hitchcock, "The LDv.521 in my possession is a 1938 edition and includes the three greys: 74/75/76. This pre-dates the 1941 assumption of their introduction." He reports this quote is from a letter to the editor of Scale Models magazine (February 1973).