Direct inverse if you're using full frame. If crop, multiply by 1.5 then invert. So if 50mm on crop frame, it's 50x1.5=75, hence, 1/75, nearest will be 1/80s

It's a rule of thumb, if you manage to stable yourself more, you can go down lower.

so does it work?

What was your focal length? Direction of flash - bounced or direct?

Upload a sample of the shoot here to illustrate what you mean. If can, state why u think u failed, and what kind of correction do u think is necessary to get the result you want. Then we can judge if your remedy would work or not.

shoot iso 1000 kawtim...takut go high iso ka???

This is why I say some people pay so much for technology but refuse to use it.

All wanna go manual, manual, manual but have no idea what you're doing. How pro is that?

I shoot in A mode around 98% of the time. When I use the flash I put it in TTL mode 95% of the time. This means I allow the camera to do its job almost all the time. Why? Because I know most times the camera will do the job properly. So to save time and headache, I just use what's available in the camera. (I used A mode, notice flash kill ambient light; high iso -takut use; then ma use M mode lor; I need shoot more in low light to explore more, this is my 1st time shooting)

I use A mode because I want to control the aperture. I let the cam decide the shutter speed. If it's too low for the shot I want, then I do some adjustment. Otherwise I'm happy to let the cam do the work.

Shooting digital means you get instant feedback on your shot. If it does not come out the way you want then you can adjust the settings.

Simple rule of thumb means leave most things to the cam. I use A mode. If pic is too dark, I see what shutter speed the cam chose. If I can go lower without introducing hand shake or motion blur, then I switch to M mode and adjust the shutter speed accordingly. After that I switch back to A mode. Unless you are shooting in a studio where all the lights are under your control, you will run into different lighting situations. Why rack your brains trying to figure out which setting will work in which area? Let the cam do the work. If it does not come out to your liking, adjust from there.

When using flash, if the flash is too strong or weak in TTL and you don't want to adjust your shutter speed or aperture, then only adjust flash power manually. If you are always fiddling with the flash, you will be too busy with the flash to be taking pictures. You will miss a lot of moments. (that's why, you also switch to M mode when cant get and then switch back -miss a moment as well; my thought is left in M mode - manual flash, instead of switch Dial mode, will be easy to adjust flash power lol... but sadly may be lack of experience, not precise adjustment enough; I thought once I defined and fix ISO, SS, aperture, and manual flash out, it work in the whole floor... that is impossible as well)

Understand that ultimately as a photographer, your pictures is what matters. No one gives a hoot what settings you used to get a good picture. Stop fiddling with your gears and just get that darn picture already! (seriously, I start not luv the 1650SSM lol..., f2.8 cant feed me on bokehlicious FEEL, that 2stops create so diff bokeh level)

^
the green box aka auto mode is there for a reason

might as well pakai a200 jer bro...technology sudah canggih pun mau takut ka???yennada!!!
see...even shootkk tembak 1000...nak takut apa if exposure spot on...capture the moment not fiddling with noise all those small2 things...hilang moment,how to ganti to customers???

me one full day doing video highlights for actual day, 2 battery half day, on A99

See my reply in bold below:

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I shoot for free for friends..and they don even give me an angpow for the help..some people really take for granted..u go there go do till sweat here and there..deliver nice photos along with a video..and, you get a little thanks..thats it..

From that onwards..i never bring camera to those ceremony...

OOF good what.. no see the jerawat..

u use 1.4 only ka porky???why didnt bump up to maybe around 2.8???

jim, u sendingto fotozzoom?? becareful they make all pictures SUPER vivid.......i normally goto one in SS2

jimlim, if u got the chance to stop by at Harvey norman, go use their Fujifilm machine. RM 0.50 per 4R photo, u ownself tune b4 print via the kiosk.

I m very satisfied with the quality the other day I printed there. hahaha

what iso were u shooting that time???
insignificant???do elaborate more....