you are not comparing apples to apples in the first place..IQ will definitely be different la bro..   (comparing between the 3 lenses, and not Sony vs Tamron).

unless you comparing 55-200 Sony & tamron..
so what's your verdict? 

Before getting to the lens choices, here's one question that you need to ask yourself:

Do you use telephoto a lot?

I am assuming that you have the 18-55mm kitlens. When you shoot, do you always go to the 55mm end of your kitlens and then wish that you can zoom in further? Like about 70% of the time?

If you do then it's clear you need a telephoto lens. If not then you're probably just thinking that having a telephoto lens would be convenient if and when you need to use it.

If you are just thinking about the convenience then I would suggest you go for the SAL18250 lens which has better IQ and faster focusing speed. The Tamron 18-200mm is cost effective but has slightly lower IQ and slow focusing speed compared to the SAL18250.

The 55-200mm has the best IQ but you need to swap lenses. If you're sure you need telephoto then get this one.

Leave the 70-300mm for now. Until you are very, very sure you need 300mm then you might be better served by getting the Sony 70-300G SSM lens instead.

what kind of photo experience do you prefer? at the wide angle end or telephoto end?

55-200 sony is quite cheap..just the 70300G is a lot more expensive because its a different class compared to the tamron..forget about it at the moment..
aiyo price also not same..how to compare fairly.. 

anly: hi, have u even been to alphanatics? there is many people selling 55-200 2nd hand under rm500. choice to choice.... if u are looking for tele.. i recomend
i. SAL55200 (better then tamron55200)
or
ii. Tamron AF 70-300mm f/4-5.6 Di LD Macro (better then SAL75300 in terms of IQ and CA issue)

for superzoom (18 to tele)
the SAL18-250 is great with shorter focusgear then other tamron, but all super zoom suffer the F6.3 and softness at end tele.

Hi..i am looking for new dslr..sony in my first choice follows by canon....I have try out Sony A33 at Sony style, it seems to be slow in process time....not suitable for me to take my kid photos....I guess A55 will be the same.

Can any expert here suggest for me from these 3 models (all expected to be out later these months):
1. Sony A580
2. Canon 60D
3. Sony A55

You cannot compare it like that. The two lenses are built for different crowds.

For sure the 55-200mm will beat the heck out of the 18-250 in the same ranges both in terms of IQ and aperture ratings but the 55-200mm is specifically a tele lens. You cannot leave the 55-200mm attached to your camera and go out with just that one lens. You will probably miss quite a number of shots if you do. (Landscapes and groups come instantly to mind.)

The 18-250mm however is designed to let you attach that one lens and go out and you'll still be able to shoot most of anything. The price you have to pay for that convenience is to sacrifice a little in terms of IQ and aperture rating.

For a person to cover the range from 18-250, he/she will have to bring at least 2 lenses if they do not want to use a superzoom. If he/she has only one camera body then he/she will need to swap lenses to get to use the different focal range.

Imagine that while out for a little stroll during your vacation, you see a new species of bird never seen before in this world. It's about to take off and go into the woods where no one will probably see it ever again. Standing where you are you can get a decent pic of the bird at 200mm focal length.

If you had the 18-250mm attached on your cam you could zoom all the way and get a decent shot.

If you had the 55-200mm but it's not currently attached to your cam, you would probably have lost the bird in the time it took for you to change lenses. If you have had the 55-200mm attached, you would have probably gotten a better pic of the bird in terms of IQ and exposure compared to the 18-250mm but that's a big IF.

That's the difference between the 2 lenses.

bataminkl: are u sure 'photo review' is ON with ALL the cameras u tried? All using the same Memory card? if not then u cant compare.

anly: no.. no... he doesnt mean 18250 will give u fast and quick capture.. ALL lenses will (provided the AF is not slow as heck la)... but it will be convenient... lets say u see something near you... u cant take it with a 55200... (near as in... few feet away).. but with the 18250... ud get the 18mm wide angle... but if u have both the 1855 and 55200.. it will take time to switch the lenses... so the key word is CONVENIENCE.

I can't decide if its me...  .. I would want 18250 but will want better IQ oso. Haha! Good luck~

agreed.

changing lenses is a real fuss IMO...

1) you'll miss important moments
2) you risk getting dust into the sensor

and also...

sometimes when u have a telephoto (say 55200) attached to ur camera... then suddenly u need a wide angle (say 1855).. so u change.. then a minute later... u suddenly need the 200mm again.. then u change again... and its not always that easy.

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Added on October 5, 2010, 2:50 pm

1st thing to do, realize your NEEDS.

2nd analyze them

3rd double analyze

4th buy

5th enjoy....

i used to have the 1750 f2.8 but i rarely utilize it.. so i sold it off at got the tamron 1118... as im more into wide angle shots such as Architecture and Huge groups... not every has the same needs... like some people here drool over the 85mm.. some drool over the 35mm (like me) haha.

how do u find abt it?
On Alphanatics.

mind share some opinion?
distortion is obvious at 11mm but reduces at you proceed to 18mm. IQ is actually pretty good. VERY lightweight.

how much u got it?
undisclosed. 

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Added on October 5, 2010, 2:59 pmnewbieeeee: ur shots are okay what.. pretty nice actually.

after looking online and all...i think nex would be a safer bet (with me being a sony user).. yes some might call me a fanboy.. so be it...

thanks for the input on my inquiry...

gosh, now i really want a nex.

in my own opinion la... id prefer the nex3 because to me i feel that:

1) i dont need the 1080p video
2) the plastic (Polycarbonate) on the nex3 is of very good quality (as opposed to the magnesium alloy bodied nex5)
3) i personally feel that the nex3 feels better in my hands than the nex5 (its all personal preference here)
4) with the price gap, i would rather get the A-E adapter

These are now in stock in Studio Zaloon!

Sony SLT-A55 body only - retail RM2499, street RM23xx
Sony SLT-A55 + 18-55mm F3.5-5.6 DT SAM - street RM26xx (only Studio Zaloon offers this package)
Sony SLT-A55 + 50mm F1.8 DT SAM - retail RM2899, street RM26xx
Sony SLT-A55 + 16-105mm F3.5-5.6 DT - retail RM4299, street RM37xx

I am not sure which package includes 8GB (not sure MSPD or SD), vacuum dry box, lens cleaning kit, only from Studio Zaloon. Vacuum dry box limited to 30 units.

zstan: Okay lah it suits the look.

jerrylyh: No lah.

The F42 was the F36 replacement, and it went for the same price.

Whatever this new flash is, it is expected to be the F42 replacement, and should go for the same price.

4 A-mount!

More to come.

eddybeh: I feel you're a bit too close to the model. #1 not quite there. #2 too in; #3 too out, and the cropped hand is quite weird. #4 better with face in one of the squares. #5 framing out. #6 you need to soften it with a reflector on the other side. #9 almost there but not in exact focus.

wingster: No, for multi-segment. That said Alphas have always underexposed so I won't say any one is better (I don't have an A550 so I can't tell you if it underexposes often.)

jerrylyh: Street price in KL is RM800.

Anly: You can buy the Extended Warranty at Studio Zaloon or any dealer. I don't think you can buy a camera and then buy the warranty from another dealer though!

destfull: The A560/A580 won't be able to focus confirm even in manual focus video wor. The A33/A55 can do that.

I shot a gig with the A900 + Opteka 85mm F1.4 and A55 + Zeiss 135mm F1.8. I have no problem with the A55's grip. Then again, my heaviest commonly-used lens is the Zeiss which is under 1 KG.

ieR: Yes, auto-gain in low light for the A55 is amazing! It sees what you cannot see.

A funny side effect of shooting with a dSLR and SLT side-by-side is that when you look through the EVF which has my Vivid setting etc, and I look at the dSLR with OVF, the OVF looks very dull because it's the true, darker tone (with less saturation).

freaky_deity:

The Tamron 90mm F2.8 Macro's MFD is 29cm.

The Sigma 105mm F2.8 Macro's MFD is 31cm.

The Minolta/Sony 100mm F2.8 Macro's MFD is 35cm.

You get to be 6cm further away from the insect, with the Minolta.