All with EOS 7D and 300mm F4 L IS lens and 25mm extension tube, except for the Darter on the mushroom, which was with the 100mm.
Your results are encouraging. I very recently obtained the extremely rare Tamron SP 400mm f4 lens * for MF film use with my OM system. Having prevously tried placing a 30mm extension behing my 300mm f2.8 for shooting dragonflies, etc, possibly across narrow bodies of water, I found (calibration) that the 400 would, with 100mm extension, give a field ca 80mm wide at the closest working distance of about 2m from the film plane. (40mm extension give a 50% wider field at the same working distance). With some Provia 400X film stock I am now ready when the circumstances present themselves.
All with EOS 7D and 300mm F4 L IS lens and 25mm extension tube, except for the Darter on the mushroom, which was with the 100mm.
Your results are encouraging. I very recently obtained the extremely rare Tamron SP 400mm f4 lens * for MF film use with my OM system. Having prevously tried placing a 30mm extension behing my 300mm f2.8 for shooting dragonflies, etc, possibly across narrow bodies of water, I found (calibration) that the 400 would, with 100mm extension, give a field ca 80mm wide at the closest working distance of about 2m from the film plane. (40mm extension give a 50% wider field at the same working distance). (With some Provia 400X film stock I am now ready when the circumstances present themselves.
All with EOS 7D and 300mm F4 L IS lens and 25mm extension tube, except for the Darter on the mushroom, which was with the 100mm.
Your results are encouraging. I very recently obtained the extremely rare Tamron SP 400mm f4 lens * for MF film use with my OM system. Having prevously tried placing a 30mm extension behing my 300mm f2.8 for shooting dragonflies, etc, possibly across narrow bodies of water, I found (calibration) that the 400 would, with 100mm extension, give a field ca 80mm wide at the closest working distance of about 2m from the film plane. With some Provia 400X film stock I am now ready when the circumstances present themselves.
All with EOS 7D and 300mm F4 L IS lens and 25mm extension tube, except for the Darter on the mushroom, which was with the 100mm.
Your results are encouraging. I very recently obtained the extremely rare Tamron SP 400mm f4 lens * for MF film use with my OM system. Having prevously tried placing a 30mm extension behing my 300mm f2.8 for shooting dragonflies, etc, possibly across narrow bodies of water, I found (calibration) that the 400 would, with 100mm extension, give a field < 120mm wide at the closest working distance of about 2m from the film plane. With some Provia 400X film stock I am now ready when the circumstances present themselves.
