Quote:
Originally Posted by Muggsy  here I go again, butting in, sorry but so many interesting points get raised in almost every thread, interesting to me anyway.
I have a 75-300 zoom, rather than upgrade to a 500, all of which seem a bit out of my price range right now, especially as I'm just starting out, can I add a tele attachement ? if so, which one ? and will doing so help ? or be an advantage.
eos 400d and canon lense.
I'll be off on holiday soon, you can rest then 
Muggsy |
If you'd said you had a 300mm prime lens then a 1.4x or 2x converter would have been a good addition. However, zoom lenses, particularly at the cheaper end, just don't have the resolution or aperture size to carry a teleconverter. You will gain very little if any detail, will lose one or two stops in brightness and possibly lose autofocus as well.
In the days of film the lowered resolution didn't matter so much as you were aiming at colour prints that came straight from a commercial photolab. You would try to do all your framing in the camera as cropping a colour picture in the darkroom yourself was difficult and expensive. But with digital you can crop on the PC, and unless your main lens has greater resolution than your sensor then digitally cropping and upsizing with Photoshop or similar would give you just as good a result as with a teleconverter.
I appreciate that big Canon zooms or primes are expensive, so if these are beyond your budget, I would recommend you save up and go for a Sigma 135-400, 175-500 or 50-500 or maybe the Tamron 200-500. Each of these will give you better reach than your 75-300 with real increases in image detail.