These birds called with the straight call similar to Tristis, but had yellow tinge and greenish hue similar to ssp abietinus.
They all had a noticeable brownish apex.
Interesting comparisons can be found on:
SternaBertTrips


#1 Eastern Common Chiffchaff (Phylloscopus collybita abietinus?)
Besh Barmag, Azerbaijan - October 27, 2015
Canon EOS 7D Mark II, Canon EF 100-400mm f/4.5-5.6L IS II USM
© Martin Lofgren


#2 Eastern Common Chiffchaff (Phylloscopus collybita abietinus?) - same bird as #1
Besh Barmag, Azerbaijan - October 27, 2015
Canon EOS 7D Mark II, Canon EF 100-400mm f/4.5-5.6L IS II USM
© Martin Lofgren


#3 Eastern Common Chiffchaff (Phylloscopus collybita abietinus?)
Besh Barmag, Azerbaijan - October 27, 2015
Canon EOS 7D Mark II, Canon EF 100-400mm f/4.5-5.6L IS II USM
© Martin Lofgren


#4 Eastern Common Chiffchaff (Phylloscopus collybita abietinus?) - same bird as #5
Besh Barmag, Azerbaijan - October 27, 2015
Canon EOS 7D Mark II, Canon EF 100-400mm f/4.5-5.6L IS II USM
© Martin Lofgren


#5 Eastern Common Chiffchaff (Phylloscopus collybita abietinus?) - same bird as #4
Besh Barmag, Azerbaijan - October 27, 2015
Canon EOS 7D Mark II, Canon EF 100-400mm f/4.5-5.6L IS II USM
© Martin Lofgren


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