How to shoot through curved glass

[MarkoD]

Originally Posted by sphelps

Same reason why macro lenses are prime. With a fixed focal length a prime lens can be designed to better reduce distortion and typically have better optical quality. For the most part the wider the zoom the more distortion you get resulting in a softer image. Not always an issue but trying to use a zoom lens in a macro type environment doesn't always work well, combine that with curved glass and you're really in trouble. Just something to keep in mind if you're trying to reduce one issue you may be introducing another one.

Now with that said one can't compare the 70-300 with the 70-200 you have, those are much different when it comes to optical quality and design, hence the price difference.

anything higher than 70 cm wont really distort.

i've shot 70-200 with extension tubes at f8 (on a tripod) with perfect sharpness.

what i would recommend for the OP is to put the camera on a tripod, turn on the live view mode and zoom in to 100% on the screen. Then manually adjust the focus

[Ginu]

Originally Posted by MarkoD

Why would it be hard to get anything sharp? I use a 70-200 f2.8 on my tank all the time

Well unfortunately, I don't have any primes to use my list of lens is above.
I am eventually going to get some primes but for now that will wait.

I've taken some pics from about 7-8 feet with the 70-300 VR and to be honest pics are quite decent, can actually see the scratches on the inside of the tank

I'm pretty sad though, I started this tank about 3 weeks ago (bought from a fellow reefer) and today I noticed the yellow tang hide and sit in the corner panting... needless to say i took him out immediately and quarantined him in a 2 gallon tank i had sitting around. I took 1g from the main tank and another 1g from my mixing bucket, however hes now on his side and don't believe he will make it through the night ... he looks fairly paralyzed now, just breathing...

Any chances anyone might know what caused his downfall? he was fine and eating yesterday, however hes always had a whitish rash on his side as in the pics further below. I will post in the disease forums and perhaps someone might know what this is. I am now afraid of the other fish and shrimp picking this thing up... whatever it is although it doesn't look like itch...

http://oi43.tinypic.com/349cti0.jpg

http://oi43.tinypic.com/29ct8o3.jpg

http://oi41.tinypic.com/28vg95k.jpg

[scubadawg]

You can buy a Canon 500D closeup filter in 77mm, I have one, never really used it too much, I have the Nikon 60mm micro, 105mm micro and the 105mm VR micro.

It's a great closeup filter to use on your telephoto, to give you Macro lens with a fairly long shooting distance, I tried it on my 70-200 VR.

http://www.the-digital-picture.com/R...ns-Review.aspx

http://xoomer.virgilio.it/ripolini/whatsnew_2.html

[Ginu]

I'll have to try that. Thanks for the suggestion.

On a side note, the foxface died and not sure what exactly got him. Now I'm afraid to add anything to the tank and contemplating if I should pull out my old 10gallon fw tank and turn it into a quarantine tank for the two clowns and cleaner wrasse.

Sad time though.

[scubadawg]

Sorry to hear that, I'm a first time reefer, getting my tank setup next month.

[MarkoD]

Um, 34 gallon tank is way too small for a yellow tang and foxface. They're probably dying from stress.

And putting your yellow tang into a 2 gallon container will do thing but kill it.

you shouldn't get large species fish for such a small tank

[Ginu]

Yep I am aware 34g is small for a tang, however it wasn't planned(fish was given to me as it was going to die in tank with two 10" + tangs) besides the fish was only 1.5-2" at max, so for the time being I think it was ok.

And I had no choice in regards to putting him into a 2g... It was the only thing I could set up as a qt in a very short time.

By the time I moved him there, the fish was on its side, so the last thing he was going to do was swim around. I just need to know what disease that was in order to make sure it doesn't spread to the dt.