gunjankv

<p>Thank you everyone for all these useful answers.<br>

I would explore my camera more to find out precisely what is the issue, if at all.<br>

I found one thing.. if I compose a picture, meter something and want to lock that exposure, there is a facility to use asteric (*) button.. it would lock exposure and allow to recompose w/o changing exposure.<br>

However, if you do not click in sometime it would again reset back to normal, means your locked exposure is lost.</p>

<p>I am little new to fully manual photography modes.<br>

I read a lot about setting exposure to certain ISP + Aperture + Shutter Speed. But when I try on my own on my Canon XTi, I wonder How could I set desired value in all of these.<br>

If I use Av mode = I have control on Aperture and ISO only<br>

Tv mode = I have control over Shutter speed and ISO only<br>

M = I can set both values but when I press shutter release button, camera again recalculates those values and I loose my desired values.<br>

Can anyone of you guide me how could I get desired results on this?<br>

I am really thankful to all in advance.</p>

<p>Gunjan</p>

<p>Thank you guys.<br /> <br /> @Gerry Morgan<br /> I might not use it for portraits. As I have Canon EF 50mm f/1.8 and its superb lens for portraits. Bokeh is excellent.<br>

I found one link about Tamron. <br>

http://www.dpreview.com/news/0903/09032401tamron60macro.asp<br>

f/2 is exciting factor for sure.</p>

<p>Tamron is launching 60mm f/2 1:1 macro soon.<br>

If anyone has any reviews or comparison, could you please share?<br>

I am considering following options when I buy macro for my EOS XTi (APS-C)<br>

1) Tamron 60mm f/2 macro<br>

2) Canon EF-S 60mm/f2.8 macro<br>

3) Sigma 50mm f2.8 EX Macro<br>

Not sure about Sigma, but Tamron seems to be a nice option.<br>

Comments?</p>

<p>Hi,<br>

I came across quite a few thumb rules which could be applied in most of the situations.<br>

Like,<br>

1) Sunny day - f/16 at 1/ISO<br>

2) Moon photo - f/22 at 1/ISO<br>

3) Ideal shutter speed for handholdability - 1/focal length<br>

Are anyo ne of you aware of any more such one line thumb rules? I think its a great help or basic guide line for any beginier or even pro or semi pro.<br>

Thank you<br>

Gunjan</p>

Thank you guys. I am going for 55-250IS for now. I would spend 6 months to 1 year on field whenever time permits.. and then once I start realizing need for more focal length, I think I would either go for 70-300 IS or 100-400 IS (L?). I should have some savings by that time.

Assume that I would only use crop body, and I cannot afford any L series lens for now. My max budget is $500.

My preference is sharp images most of the time, I would not crop too much.. most of my prints would be 8x10 max..

image quality and having IS is my top most preference.

 

Based on all these, any suggestion on which lens should I go for? I have read all kind of reviews of both, both

are great as per those reviews.. so confused.. and putting this on forum to come out of confusion..

 

Thanks

I think it depends on person to person.. what kind of photos generally they take, what kind of focal length they use most of the time, whats their lens kit containing etc.

 

If I already have good array of lenses (that could fit even to full frame body), I do not think having full frame is really very big reason to shift to, unless I do not have camera body with sufficiently good features.

 

Those cases where you do not have liberty to change your view position (by moving behind or so) would make difference between having same lens on full frame vs crop frame body. But even in that case if I have wider angle lens I can still go on.

 

Crop frame gives more telephoto range with same lens compared to full frame. That turns out to be an advantage w/o buying any other accessories, you are reaching further.. There is no difference in image quality and sharpness between a photo taken on full frame vs on crop frame. Having additional focal length at wider end is the only benefit I see to go for full frame. May be more experienced people would have better opinion on this.!

@Ron Hartman

 

"I bought the 70-300 IS when it first came out a few years ago.

I wasn't impressed at the time, so I sent it to Canon for the recall on the early production

(for a vertical framing issue). I don't remember what they did, but it came back noticeably sharper.

It's been one of my favorite lenses ever since."

 

It arises one question in my mind.. If suppose now I buy 70-300 IS lens from some reliable shop,

could I assume that my lens would come with vertical framing issue fixed?

 

I am sorry if its a layman question, but just wanted to make sure before I put so much money.

 

Thank you.

I have read reviews about both. They say L series is definitely better in terms of corner sharpness and overall

image quality. Only thing is its not having IS.

 

My use would be mainly nature closeups, portraits, building and architecture and to some extent functions and

get-togather. I am only thinking about is whether I really need IS in these kind of use?

 

Any suggestions or advise would really help me clarify some aspects and deciding the candidate!

 

Thank you

Gunjan