Originally posted by AggieDad Bruce – Many thanks for your most complete response. You brought up some interesting points.
I also did a bunch of Internet research today including a number of YouTube videos. The more I learn, the more I think I would be jumping from the frying pan into the fire. The single f/6.3 or f/8 aperture and the very thin depth of field would probably offset the lens being smaller and lighter. I suspect I will soon have to limit my long lens business to my 55-300mm.
I agree that going mirror might be as tricky as carrying your big tele zoom... the reduced contrast & fixed aperture & shallow DoF of a mirror have their own challenges.
I have two mirrors : a cheap f6.3 500mm walimex and the pentax zoom f8-f12 400-600mm. I like to play with the mirrors, but I don't consider them as my standard tele lens: I feel my heavy and long vintage pentax-k 400mm f5.6 is easier to shoot handheld - albeit heavy and equiped with mount for tripod use - than these lightweight mirrors. The succesfull picture hitrate of the 400mm is defintely higher than the mirrors !
But as an aternative long tele solution, I also use my pentax-m* 300mm f4 with the 1.7x AFA teleconvertor. It yields 510 mm f6.7, and is smaller and easier to carry/handle than my 400 mm.
The TC+300 weighs ~950 gr and ~160 mm long
The 400mm 1250 gr and 277 mm long
So my alternative for a lighter, longer tele :
- use a TC convertor with a light tele (prime) : a 300 mm with a 1.4x or 1.7x gives a range 420 or 510mm
- it will be more compact than the equivalent focal length lens
- the TC tends to increase (magnify) the optical imperfections of a lens ( hence my advice for a prime or a quality zoom as base lens)
- the disadvantage is one stop less light for 1.4x, 1 1/2 stop less for 1.7x and 2 stop less for 2x convertors. Hence f4 aperture of the base lens is good (lower is better)
Note: the 1.4x TC is available new, with support for modern lenses (with focus motor, lens info contacts etc...), the others are vintage models and fully manual focus and metering.
If you already own a good base lens, the convertor addition is relative modest in price.
The other thing you might consider is a light monopod. Still easy to carry, giving more support for your long lens, but still flexible enough for that handheld shooting feeling.
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