DA 55-300 or sigma 120-400

Not bad for a lens of £145

My piccies.
The 55-300mm is an excellent lens and quite small and light. From what I've seen of it the 120-400mm is huge by comparison.
Half Man... Half Pentax ... Half Cucumber
Pentax K-1 + K-5 and some other stuff
Algi
From what I've seen of it the 120-400mm is huge by comparison.
You're not wrong, I've had to buy a new camera bag to fit mine in.
My Website
Richard
K5 + Penta DA 18-135, Pentax 55-300, Pentax A-50mm F1.7, Sigma 10-20, Tamron 17-50, Tamron SP90 DI Macro
Manfrotto 190XPROB-804RC2 Head,
Samsung Flash Unit.
link Flickr
link PPG
http://www.flickr.com/photos/dcweather/page4/
Taken with DAL 55-300 and K-x unless it says otherwise.
Half Man... Half Pentax ... Half Cucumber
Pentax K-1 + K-5 and some other stuff
Algi
As regard to the extra range of a 400mm, you are only a crop away from that, the DA at 300mm is good enough to handle it.
This was taken through bars with the DA, not the sharpest but could you handhold a 400mm zoom to the same quality?

if you do get a big siggy zoom will you be able to handhold it at 400mm? if not then you will find using it a pain, tripods,beanbags,etc.
Davex,
K5 + 8mm-500mm zooms and primes
Please feel free to play with any images I post.
My flickr: link

I have had the Pentax 80-320, the Tamron 70-300 and then the Pentax 55-300 before i bought the Pentax DA*300 yesterday. Today I went birding and the difference is amazing, I can crop 1:1 shots from the *300 and still get quality as good as, or very close to, uncropped shots from the 55-300. However look at the price difference - I'd be very disappointed if I couldn't ! And even at well over 1kg I didn't find it too heavy to hand hold shots - I think the 120-400 is a similar weight - neither of them are 150-500 or 50-500 monsters !
IQ wise the 120-400 falls somewhat in between, as it's price would indicate, but closer in quality to the *300 than the 55-300. It really depends on you and how 'serious' you are with regard to your birding. If you know this is not a whim and you are going to be 'relatively' serious about it - then I'd save your money and go for the 120-400.
Experienced photographers will always tell you 'buy the best glass you can afford rather than the best camera you can afford' and there's a reason for that. If I'd listened to that good advice when given instead of going through 4 lenses to get where I wanted to be when I started then I'd have saved a few hundred and in the interim have got some brilliant shots instead of some 'meh' shots lost because the lenses I was using couldn't resolve fine detail from the distance I was shooting at.
The 55-300 is a great bit of kit for the money (as is the Tamron - though not quite at the 55-300 level) but doesn't do too well cropping. The depth of resolution is just not there.
IMHO if you are not sure what you want then get a used Tamron (60 - 75 GBP) or used DAL version of the 55-300, that way you won't lose much (if anything ) when you come to upgrade, and upgrade you will if you are really into birding. If you are already sure - then get the 120-400, I've seen some great shots posted from it across the different fora.
http://frogfish.smugmug.com/ Pentax. Pentax DA*300/4, Cosina 55/1.2, Lens Baby Composer Pro & Edge 80, AFA x1.7, Metz 50 af1.
Nikon. D800. D600. Sigma 500/4.5, Nikon 300/2.8 VRII, Sigma 120-300/2.8, Zeiss Distagon ZF2 21/2.8, Zeiss Distagon ZF2 35/2.0, Sigma 50/1.4, Nikkor 85/1.8, Nikon TC20EIII, Nikon TC14EII, Kenko x1.4, Sigma 2.0

Pentax K-x, Da-L 18-55mm, Da-L 50-200mm, Tamron Di Ld 70-300mm
Dhumpy
Member
Redditch
I've read on here the pentax stays sharp at the long end and wondering if this is the case would i be better off just cropping in photoshop to makeup for the shorter focal length (I'm not trying to print A1 images or anything!)
i currently only own the dal 18-55 and dal 50-200 (kit lenses with my KX)so with the da 55-300 i could really get shot of my longer kit lens as i'd still have a full range of focal lengths covered. (All makes perfect sense from a budget point of view)
But hopefully people in the know on here can tell me if i'd really reap any advantages having the Sigma? I just dont want to end up in 3-4 months time kickin myself that i should have saved and gone for the sigma...
Right apologies for the essay look forward to hearing your thoughts
Thanks
Dave
Pentax K-x, Da-L 18-55mm, Da-L 50-200mm, Tamron Di Ld 70-300mm