What lenses are good enough for the A900?

Discussion in 'Sony/Minolta' started by bill_tuthill, Dec 18, 2008.

  1. Dpreview.com just posted a review of the Sony 50/1.4, similar to the Minolta 50/1.4 RS. This got me thinking about what lenses are good enough for the amazingly high-res A900. The Sony 50/1.4 might not be good enough, especially wide open.
    Compared to Canon, which offers a 24-70/2.8 or 24-105/4 IS with filter thread matching the 70-200/2.8 IS, what does Sony offer? Do they expect customers to buy the Zeiss 24-70/2.8 with bad bokeh and the redesigned Minolta 70-200/2.8 SSM renamed SAL or something? If the 50/1.4 can't match the resolution of the A900, how could these lenses? I thought the Sigma 70-200/2.8 was better than the old Minolta, but maybe I missed some reviews.
    Personal note: I have the 24-50/4, which might be almost good enough for the A900, but even with film, my 70-210/4 is disappointing at the long end, and its color balance is too warm. I also have a 70-210/3.5-4.5, but it is mediocre even with film at the short end. Obviously if I bought an A900 I would neeed a new long zoom lens, at minimum. Oh yeah, I have a 50/1.4 and it is better than either of these lenses.
     
  2. If you are looking at buying an A900, you shouldn't just be factoring in the price of the body like you say. If you want to meet the full potential of the A900's sensor then, yes, you do have to purchase expensive glass. However, a number of people have shown that you can get more than reasonable results with more "afforable" glass... Just if you splash out on the modern G/ZA glass, you are going to get better wide open performance & corner/edge performance.
    The A900 has roughly the same pixel density as the A700 afterall, so it is no hard task to meet the resolution of the sensor in the center atleast. Just older/cheap glass will often need to be stopped down a lot to even out the performance across the frame.
    Personally, I would have no hesitation in using 24-50/4, 50/1.4 & 70-200/4 first generation lenses on the A900 - the 50/1.4RS/SAL is excellent in my opinion, I love the bokeh, colour & size... you only need to stop it down to get razor sharp pics. But then I don't do anything particularly critical. If I wanted to really take advantage of the A900 I would be buying 16-35/2.8, 50/1.4, 85/1.4, 135/1.8, 70-400/4.5-5.6. Then I'd get two or three 500GB hard drives & I'd be good for a long time.
    Spend as little or as much as you want, it's your choice afterall, no1 can tell you anything is "required" as only you know that. :)
    What sort of photography do you do? What are you shooting? What lighting conditions? How large do you print?
    [​IMG]
     
  3. I did most types of photography with my old SLR kit, but the only type I truly enjoyed was macro, and nobody pays for that. For my website, a P&S is good enough. It's not a photography website. I own accessory flash. The A900 is not the best for low light, but it has more dynamic range than competitors, which is appealing. I printed 20x30" from the Minolta FZE (Riva) 28-75 and it was surprisingly good.
    Thanks for the 70-400/4-5.6 reference. That's a lens announcement I missed. Seems slow at the long end, but optical quality could make it worthwhile. Apparently it takes size 77 filters. At the short end, a 16-35/2.8 is of no interest to me, although some people might want it, particularly those with APS sensors planning to upgrade eventually.
     
  4. Bill, if you haven't tried macro with a Sony DSLR yet, you are in for a treat :). Always loved macro with my film SLR (dynax 7) before I went digital, but success was not so high. A extremely old (&half broken) tripod meant that I often couldn't get into the positions I wanted. But with the combinations of SSS/wireless flash, I could handhold at 1:1 and get tack sharp photos, which obviously meant a massive amount of freedom.
    So, if you want to do macro, the Minolta/Sony 100/2.8 is a must - it will never let you down.
    But are you wanting to make money from this camera...? I'm a bit confused. Are you using this for your job or just pleasure?
    Good luck with your choices!
     
  5. I've had an A900 for a few weeks now and I'm also not sure about lenses. I've been using it with the Minolta 24 - 85 which seems like a good compromise. The 28 - 135 is probably sharper but the weight and poor close focussing distance are against it. I've also used the 70 - 210 f4 but not in situations where absolute sharpness is involved (gigs). I think the only lens in my possession which will get near to the sensor resolution is the 50mm macro but I've not had occasion to try it yet, being a little nervous about changing lenses unless I have to.
    With the A900 I feel that other factors than pure lens sharpness come into play, for example focussing is quite critical and depth of field may be effectively shallower, also camera shake (even with SSS) and mirror slap, you should probably use mirror lock up to get the best out of the sensor.
     
  6. I don't have an A900, yet. But it's in my dreams every night. From what I've read and heard about it, G glass, as Richards says, is the way to go, at least for now. Who knows, they may begin work an a 'Platinum' series of lenses that could do well on future, higher resolution full-frame cameras. DP Review still gives the 50mm 1.4 8 to 8.5 in ratings, despite having had some negative criticism of it, so I guess you don't always need 'G' glass. I wish I could give it a try for myself, so I could tell you more (all donations are welcome).
     
  7. I think photo.net needs to start making donations towards a christmas present for Andrew :)
     
  8. The knock on the 24-85/3.5-4.5 was (moustache) distortion, but it is one of the sharper Minolta zoom lenses. I borrowed one for a while and liked the 24-50/4 better, although I can understand the reverse if you like to take pictures in the 50-85 range.
    It seems to me that the Tamron 28-75/2.8 is the most cost-effective short zoom on the market. Although it does not meet the MTF standards of the Zeiss 24-70/2.8, resolving around 2150 line widths per picture height instead of 2350, the Tamron has better bokeh. Downside is, with oddball 67 filters, I can't think what long zoom lens could accompany it. With 77 step-up ring, what long zooms have the same color reproduction?
     
  9. I've been trying a number of lenses on the A900... most recently the new 70-400mm. I shot a couple quick tests of my daughter with the lens wide open.... was very pleased with the results... her eyes were tack sharp.
    I used the 100 macro a bit last week ... again a great lens, that was very sharp. Of course the 135 is stellar.... the 85 is a favorite as well but I rarely use it.
    I just picked up the 24-70 this week... haven't even had a chance to crack the box but should play with it over Christmas.
    I don't have the 50mm that was mentioned earlier so can't comment on it. I do have the 35mm F1.4 which is fair but not great wide open. The 20mm is better. When I put the 20mm on the A900 for the first time I was surprised how wide it was.... 20mm on a cropped chip just isn't that wide and I had forgot how wide things are once you're back to full frame.
    Hope this helps.
    -Rob
     
  10. Hi guys. I have owned the a900 for a few months and have tested a handful of my Sony/Minolta lenses on it. In fact, I just got back today from a 4-day trip to Grand Teton National Park and have been pixel peeping my processed RAW files tonight. Due to cloudy and snowy conditions I didn't see the peaks the entire time - grrrr! Anyway, the Zeiss 24-70, which I just bought and used extensively on the trip, is stunning. I should use capital letters and exclamation points to underscore how amazing this lens is. When opened in Photoshop, unsharpened RAW files are so sharp that minimal use of unsharp mask can create apparently oversharpened images. In-camera jpegs (which I rarely shoot) appear oversharpened at default settings, which is not an issue with the 50mm 1.7. Unrezzed files sized at 24x36 inches @240 dpi look like medium format scans. I can't wait to make some large prints from these files! The image quality of a900 files taken with the 24-70 lens will make it surprisingly difficult for me to decide between my 4x5 camera and the a900 for many photographic outings next year.
    The real surprise for me has been the Sigma 100-300 f4. It is as sharp as my 100 2.8 macro and is tack sharp wide open, even at 300mm. Not surprisingly, the 100 macro is also an excellent performer.
    Based on my experience, the aforementioned lenses are definitely good enough for the a900 if you're a landscape photographer like me and seek absolute maximum detail and corner-to-corner sharpness. Unfortunately, they are also very expensive. The 50 1.7 is solid but not in the same league as these lenses. My Sigma 20-40 2.8 is nowhere close to being good enough for this camera for the above purposes. Of course, you can take perfectly good images with any number of lenses on this camera, and the results with even a mediocre lens will exceed those attainable with any other Sony camera body. I hope these observations are of some help. It looks like there are some good, less expensive alternatives to the Zeiss 24-70 lens but I can tell you that you definitely get what you pay for with it.
     
  11. Hi,
    Having a A-900 for a couple of weeks and after doing some tests I found that at least SAL 24-70/2.8, Minolta 20/2.8 are working well. According to a few samples the Minolta 80-200/2.8 APO holds up well.
    Here are some full size images (click on original for high quality full size JPEGs)
    http://www.pbase.com/ekr/a900_test
    Michael Reichmann at Luminous Landscape is using a couple of A900s with the following lenses and has favorable opinions:
    Sigma 12-24
    Sigma 50-500
    SAL 24-70/2.8
    SAL 70-300G
    SAL 50/1.4
    SAL 500/8 RF
    http://www.luminous-landscape.com/reviews/cameras/a900-one-month.shtml
    As a side note, very few lenses are sharp over the entire frame when fully open.
    Erik
     
  12. Thanks Erik, I had not seen those reviews. I have to disagree with Michael Reichmann that shadow detail is more important than highlight detail. Perhaps this is because I live in a place with an excess of light. Digital has more than enough shadow detail, but I hate the way my current camera blows out highlights. The A900 seems to do this less than anything except possibly Fuji DSLR models.
    I did not realize that the SAL 70-300/4-5.6 G was so much better than the non-G Minolta with similar specs, as these articles seem to imply.
     
  13. Hello,
    The dPreview review is misleading because their MTF measurements are limited by the ceiling of sensor resolution (ie it's not a fully optical test). So for instance, the Nikon 50/1.4 may seem better than the Sony 50 1.4 because the Nikon hits the Nyquist frequency of the D3 12MP sensor over most of the frame at f8, while the Sony doesn't. But if you look closer you will see that the Sony is actually sharper than the Nikon at all apertures. I own the A900 and Sony 50/1.4 and I think that the combo makes terrific images from f2 onwards. I have also had excellent results with the Minoltas 20/2.8 RS, 35/2 RS, 100 2.8 macro RS, and good results with the 24-105 D and 100-300 APO D. Generally I find the A900 to be quite forgiving on lenses but I don't frequently print larger than A4.
    A french A900 owner who also has access to a DxO test bench has reported that the 24-50 f4 is poor on A900. The full writeup (french, sorry) is here:
    http://www.alphadxd.fr/viewtopic.php?f=1&t=15631
    Quick translated summary:
    very good even wide open: 2,8/80-200mm APO G HS, 2,8/200mm APO G non HS, 2,8/50mm macro OLD et 2,8/100mm macro RS, 2/100mm
    very good if stopped down: 2,8/20mm OLD (il faut fermer à f/8 ou f/11 et là c'est Très bon), 2/35mm OLD (f/8 ou f/11), 2/28mm OLD (f/11 pour les bords même si le centre descend un peu), le 2,8/135mm (f/11)
    good if stopped down: 2,8/28-75mm D, 3,5-4,5/24-85mm et 3,5-4,5/24-105mm
    poor: 3,5/35-105mm 4/24-50mm
     

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