Originally posted by cookiies hey can anyone help?
Ive got a pentax 18-55mm and a Sigma DG APO MACRO 70 mm - 300 mm.
I want to get some macro filters but i dont want to buy two sets for my two lenses so does anyone know which would be better to use with macro filters?
Rather than buying a set of close-up lenses consider buying one good close-up lens and using it on a zoom lens to cover a range of magnifications.
You'll be happiest with a lens that allows a good space between itself and the subject - called "working distance".
I think your best bet will be to chose an achromatic or apchromatic lens with focal length between 150-250mm, or diopter between 4 and 6.
Raynox, Marmuri, and Canon make such lenses.
The $75 Raynox DCR 150 (208mm) is very popular - it takes superb photos and will snap onto any lens with a 52-67mm filter ring.
On your 70-300mm zoom it would give magnifications of from a minimum of about 1:3 to almost 2:1 - a very useful range for hand-holding - with a working distance of about 8". All your lens' automatic functions including flash will continue to work (this is important).
It is tempting to buy a set of simpler lenses for quite a bit less but the extra $50 or so for a good lens is well worth it quality-wise.