07-15-2010, 09:28 PM
Standard zooms for the smaller formats are often equipped with rather large maximum apertures. The quality may actually be quite ok, but of no use for an APS-C or FF camera <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='
' />.
The Mamiya Sekor is ok, provided it is the multi-coated version. I don't know M-S well enough to be able to tell you straight away, however <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='' />. Most 50-55 mm lenses from the analog days, provided they have apertures no larger than F/1.7, tend to be quite good. The optical designs used are actually still used today, except for lenses like the F/1.2s and faster, and the Sigma 50 F/1.4. They typically perform better up to about F/2.5 than their faster brethren (the F/1.4s). At F/2.8 the F/1.4s normally get better, up to about F/5.6, and then from F/8 they tend to be equal again.
If you pay a really low price for the Danubia, it may be worthwhile as a novelty gadget. Don't expect too much from it.
The Dixi is likely one of the many advertising brands only, and this company likely got their stuff from a variety of manufacturers, whereever they could get it cheapest. Could be Cosina, the cheap stuff that is, or almost anything else. If the coating looks green, it is probably a Cosina, if it is bluish purple, it could be anything.
Kind regards, Wim
' />.The Mamiya Sekor is ok, provided it is the multi-coated version. I don't know M-S well enough to be able to tell you straight away, however <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='
' />. Most 50-55 mm lenses from the analog days, provided they have apertures no larger than F/1.7, tend to be quite good. The optical designs used are actually still used today, except for lenses like the F/1.2s and faster, and the Sigma 50 F/1.4. They typically perform better up to about F/2.5 than their faster brethren (the F/1.4s). At F/2.8 the F/1.4s normally get better, up to about F/5.6, and then from F/8 they tend to be equal again.If you pay a really low price for the Danubia, it may be worthwhile as a novelty gadget. Don't expect too much from it.
The Dixi is likely one of the many advertising brands only, and this company likely got their stuff from a variety of manufacturers, whereever they could get it cheapest. Could be Cosina, the cheap stuff that is, or almost anything else. If the coating looks green, it is probably a Cosina, if it is bluish purple, it could be anything.
Kind regards, Wim
Gear: Canon EOS R with 3 primes and 2 zooms, 4 EF-R adapters, Canon EOS 5 (analog), 9 Canon EF primes, a lone Canon EF zoom, 2 extenders, 2 converters, tubes; Olympus OM-D 1 Mk II & Pen F with 12 primes, 6 zooms, and 3 Metabones EF-MFT adapters ....